Measurement of the production cross section of an isolated photon associated with jets in proton-proton collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
A measurement of the cross section for the production of an isolated photon in association with jets in proton-proton collisions at a center-of-mass energy $\sqrt{s}$ = 7 TeV is presented. Photons are reconstructed in the pseudorapidity range $|\eta^{\gamma}| \lt 1.37$ and with a transverse energy $E_T^\gamma$ > 25 GeV. Jets are reconstructed in the rapidity range $|y^{jet}|$ < 4.4 and with a transverse momentum $p_T^{jet}$ > 20 GeV. The differential cross section $d\sigma/dE_T^\gamma$ is measured, as a function of the photon transverse energy, for three different rapidity ranges of the leading-$p_T$ jet: $|y^{jet}| < 1.2, 1.2 \le |y^{jet}|$ < 2.8 and 2.8 $\le |y^{jet}|$ < 4.4. For each rapidity configuration the same-sign $(\eta^{\gamma}y^{jet}\ge 0)$ and opposite-sign $(\eta^{\gamma}y^{jet}<0)$ cases are studied separately. The results are based on an integrated luminosity of 37 pb$^{-1}$, collected with the ATLAS detector at the LHC. Next-to-leading order perturbative QCD calculations are found to be in fair agreement with the data, except for $E_T^{\gamma} \lt 45$ GeV, where the theoretical predictions overestimate the measured cross sections.
14 March 2012
Contact: Standard Model conveners
internal
e-print arXiv:1203.3161 - pdf from arXiv
Figures
Figure 01
Transverse energy distribution of photon candidates in photon + jet events selected in the 2010 ATLAS data, before background subtraction. The distribution is normalized by the integrated luminosity and the transverse energy bin width. Events with ET(gamma)<=45 GeV have been collected with the (prescaled) 20 GeV photon trigger. Events with ET(gamma)>45 GeV have been collected with the (unprescaled) 40 GeV photon trigger.
png (79kB) eps (23kB) pdf (8kB)
Figure 02a
Estimated signal purity in data as a function of the photon transverse energy, for the same-sign (full circles) and opposite-sign (open triangles) angular configurations. Central jets are selected. A small horizontal displacement has been added to the points corresponding to the opposite-sign configurations, so that the error bars are clearly shown. The errors are statistical only.
png (49kB) eps (13kB) pdf (6kB)
Figure 02b
Estimated signal yield normalized by bin width and integrated luminosity in data as a function of the photon transverse energy, for the same-sign (full circles) and opposite-sign (open triangles) angular configurations. Central jets are selected. A small horizontal displacement has been added to the points corresponding to the opposite-sign configurations, so that the error bars are clearly shown. The errors are statistical only.
png (53kB) eps (13kB) pdf (6kB)
Figure 02c
Estimated signal purity in data as a function of the photon transverse energy, for the same-sign (full circles) and opposite-sign (open triangles) angular configurations. Forward jets are selected. A small horizontal displacement has been added to the points corresponding to the opposite-sign configurations, so that the error bars are clearly shown. The errors are statistical only.
png (51kB) eps (14kB) pdf (6kB)
Figure 02d
Estimated signal yield normalized by bin width and integrated luminosity in data as a function of the photon transverse energy, for the same-sign (full circles) and opposite-sign (open triangles) angular configurations. Forward jets are selected. A small horizontal displacement has been added to the points corresponding to the opposite-sign configurations, so that the error bars are clearly shown. The errors are statistical only.
png (54kB) eps (14kB) pdf (6kB)
Figure 02e
Estimated signal purity in data as a function of the photon transverse energy, for the same-sign (full circles) and opposite-sign (open triangles) angular configurations. Very forward jets are selected. A small horizontal displacement has been added to the points corresponding to the opposite-sign configurations, so that the error bars are clearly shown. The errors are statistical only.
png (50kB) eps (14kB) pdf (6kB)
Figure 02f
Estimated signal yield normalized by bin width and integrated luminosity in data as a function of the photon transverse energy, for the same-sign (full circles) and opposite-sign (open triangles) angular configurations. Very forward jets are selected. A small horizontal displacement has been added to the points corresponding to the opposite-sign configurations, so that the error bars are clearly shown. The errors are statistical only.
png (54kB) eps (14kB) pdf (6kB)
Figure 03a
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the central-jet (|y(jet)|<1.2), same-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (65kB) eps (22kB) pdf (9kB)
Figure 03b
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the central-jet (|y(jet)|<1.2), opposite-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (65kB) eps (22kB) pdf (9kB)
Figure 03c
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the forward-jet (1.2<|y(jet)|<2.8), same-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (71kB) eps (24kB) pdf (8kB)
Figure 03d
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the forward-jet (1.2<|y(jet)|<2.8), opposite-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (66kB) eps (22kB) pdf (9kB)
Figure 03e
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the very forward-jet (2.8<|y(jet)|<4.4), same-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (73kB) eps (23kB) pdf (8kB)
Figure 03f
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the very forward-jet (2.8<|y(jet)|<4.4), opposite-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (66kB) eps (22kB) pdf (8kB)
Auxiliary material
Figure 04a
Summary of the systematic uncertainties on the JETPHOX parton-level photon-jet cross section prediction as a function of the photon ET in the different photon and jet configurations. (a,b) : |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d) : 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f) : 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (54kB) eps (13kB) pdf (5kB)
Figure 04b
Summary of the systematic uncertainties on the JETPHOX parton-level photon-jet cross section prediction as a function of the photon ET in the different photon and jet configurations. (a,b) : |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d) : 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f) : 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (54kB) eps (13kB) pdf (5kB)
Figure 04c
Summary of the systematic uncertainties on the JETPHOX parton-level photon-jet cross section prediction as a function of the photon ET in the different photon and jet configurations. (a,b) : |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d) : 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f) : 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (55kB) eps (13kB) pdf (5kB)
Figure 04d
Summary of the systematic uncertainties on the JETPHOX parton-level photon-jet cross section prediction as a function of the photon ET in the different photon and jet configurations. (a,b) : |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d) : 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f) : 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (55kB) eps (13kB) pdf (5kB)
Figure 04e
Summary of the systematic uncertainties on the JETPHOX parton-level photon-jet cross section prediction as a function of the photon ET in the different photon and jet configurations. (a,b) : |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d) : 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f) : 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (51kB) eps (12kB) pdf (5kB)
Figure 04f
Summary of the systematic uncertainties on the JETPHOX parton-level photon-jet cross section prediction as a function of the photon ET in the different photon and jet configurations. (a,b) : |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d) : 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f) : 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (51kB) eps (12kB) pdf (5kB)
Figure 05a
Non-perturbative correction factors for the production cross section of isolated photons associated with jets in pp collisions at 7 TeV. Jets are reconstructed using the anti-kt algorithm with a radius parameter R = 0.4. The correction factors are derived using various Monte Carlo generators and underlying event tunes: PYTHIA with the AMBT1 (black circles) and the Perugia 2010 (blue squares) tunes, Herwig++ with the default tune (red triangles). The yellow band represents the envelope of the central values of the corrections factors predicted by the different Monte Carlo generators. The green band represents the envelope of the corrections factors including their uncertainties from the limited Monte Carlo statistics. (a,b): |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d): 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f): 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (63kB) eps (17kB) pdf (7kB)
Figure 05b
Non-perturbative correction factors for the production cross section of isolated photons associated with jets in pp collisions at 7 TeV. Jets are reconstructed using the anti-kt algorithm with a radius parameter R = 0.4. The correction factors are derived using various Monte Carlo generators and underlying event tunes: PYTHIA with the AMBT1 (black circles) and the Perugia 2010 (blue squares) tunes, Herwig++ with the default tune (red triangles). The yellow band represents the envelope of the central values of the corrections factors predicted by the different Monte Carlo generators. The green band represents the envelope of the corrections factors including their uncertainties from the limited Monte Carlo statistics. (a,b): |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d): 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f): 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (64kB) eps (18kB) pdf (8kB)
Figure 05c
Non-perturbative correction factors for the production cross section of isolated photons associated with jets in pp collisions at 7 TeV. Jets are reconstructed using the anti-kt algorithm with a radius parameter R = 0.4. The correction factors are derived using various Monte Carlo generators and underlying event tunes: PYTHIA with the AMBT1 (black circles) and the Perugia 2010 (blue squares) tunes, Herwig++ with the default tune (red triangles). The yellow band represents the envelope of the central values of the corrections factors predicted by the different Monte Carlo generators. The green band represents the envelope of the corrections factors including their uncertainties from the limited Monte Carlo statistics. (a,b): |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d): 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f): 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (67kB) eps (17kB) pdf (7kB)
Figure 05d
Non-perturbative correction factors for the production cross section of isolated photons associated with jets in pp collisions at 7 TeV. Jets are reconstructed using the anti-kt algorithm with a radius parameter R = 0.4. The correction factors are derived using various Monte Carlo generators and underlying event tunes: PYTHIA with the AMBT1 (black circles) and the Perugia 2010 (blue squares) tunes, Herwig++ with the default tune (red triangles). The yellow band represents the envelope of the central values of the corrections factors predicted by the different Monte Carlo generators. The green band represents the envelope of the corrections factors including their uncertainties from the limited Monte Carlo statistics. (a,b): |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d): 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f): 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (64kB) eps (17kB) pdf (8kB)
Figure 05e
Non-perturbative correction factors for the production cross section of isolated photons associated with jets in pp collisions at 7 TeV. Jets are reconstructed using the anti-kt algorithm with a radius parameter R = 0.4. The correction factors are derived using various Monte Carlo generators and underlying event tunes: PYTHIA with the AMBT1 (black circles) and the Perugia 2010 (blue squares) tunes, Herwig++ with the default tune (red triangles). The yellow band represents the envelope of the central values of the corrections factors predicted by the different Monte Carlo generators. The green band represents the envelope of the corrections factors including their uncertainties from the limited Monte Carlo statistics. (a,b): |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d): 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f): 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (67kB) eps (18kB) pdf (8kB)
Figure 05f
Non-perturbative correction factors for the production cross section of isolated photons associated with jets in pp collisions at 7 TeV. Jets are reconstructed using the anti-kt algorithm with a radius parameter R = 0.4. The correction factors are derived using various Monte Carlo generators and underlying event tunes: PYTHIA with the AMBT1 (black circles) and the Perugia 2010 (blue squares) tunes, Herwig++ with the default tune (red triangles). The yellow band represents the envelope of the central values of the corrections factors predicted by the different Monte Carlo generators. The green band represents the envelope of the corrections factors including their uncertainties from the limited Monte Carlo statistics. (a,b): |yjet| < 1.2, same sign (a) and opposite sign (b). (c,d): 1.2 < |yjet| < 2.8, same sign (c) and opposite sign (d). (e,f): 2.8 < |yjet| < 4.4, same sign (e) and opposite sign (f).
png (69kB) eps (18kB) pdf (7kB)
Figure 06a
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the central-jet (|y(jet)|<1.2), same-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the MSTW 2008 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (65kB) eps (22kB) pdf (9kB)
Figure 06b
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the central-jet (|y(jet)|<1.2), opposite-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the MSTW 2008 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (66kB) eps (22kB) pdf (9kB)
Figure 06c
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the forward-jet (1.2<|y(jet)|<2.8), same-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the MSTW 2008 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (65kB) eps (22kB) pdf (9kB)
Figure 06d
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the forward-jet (1.2<|y(jet)|<2.8), opposite-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the MSTW 2008 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (66kB) eps (22kB) pdf (9kB)
Figure 06e
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the very forward-jet (2.8<|y(jet)|<4.4), same-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the MSTW 2008 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (67kB) eps (22kB) pdf (8kB)
Figure 06f
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the very forward-jet (2.8<|y(jet)|<4.4), opposite-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the MSTW 2008 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (66kB) eps (22kB) pdf (8kB)
Figure 07a
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the central-jet (|y(jet)|<1.2), same-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the NNPDF 2.1 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (65kB) eps (22kB) pdf (9kB)
Figure 07b
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the central-jet (|y(jet)|<1.2), opposite-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the NNPDF 2.1 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (65kB) eps (22kB) pdf (9kB)
Figure 07c
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the forward-jet (1.2<|y(jet)|<2.8), same-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the NNPDF 2.1 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (65kB) eps (22kB) pdf (9kB)
Figure 07d
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the forward-jet (1.2<|y(jet)|<2.8), opposite-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the NNPDF 2.1 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (66kB) eps (22kB) pdf (9kB)
Figure 07e
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the very forward-jet (2.8<|y(jet)|<4.4), same-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the NNPDF 2.1 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (67kB) eps (22kB) pdf (8kB)
Figure 07f
Top graph: experimental (black dots) and theoretical (blue line) photon-jet production cross sections, for the very forward-jet (2.8<|y(jet)|<4.4), opposite-sign angular configuration. The black error bars represent the total experimental uncertainty. The blue bands show the total uncertainties on the theoretical predictions obtained with JETPHOX using the NNPDF 2.1 set of PDFs. Bottom graph: ratio between the measured and the predicted cross sections. The blue bands show the theoretical uncertainties while the error bars show the experimental uncertainties on the ratio.
png (66kB) eps (22kB) pdf (8kB)
Figure 08a
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing direct photons from the hard parton scattering and photons from quark bremsstrahlung. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (64kB) eps (22kB) pdf (9kB)
Figure 08b
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing direct photons from the hard parton scattering and photons from quark bremsstrahlung. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (66kB) eps (22kB) pdf (9kB)
Figure 08c
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing direct photons from the hard parton scattering and photons from quark bremsstrahlung. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (72kB) eps (24kB) pdf (9kB)
Figure 08d
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing direct photons from the hard parton scattering and photons from quark bremsstrahlung. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (67kB) eps (23kB) pdf (9kB)
Figure 08e
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing direct photons from the hard parton scattering and photons from quark bremsstrahlung. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (68kB) eps (23kB) pdf (9kB)
Figure 08f
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing direct photons from the hard parton scattering and photons from quark bremsstrahlung. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (68kB) eps (23kB) pdf (9kB)
Figure 09a
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing only direct photons from the hard parton scattering. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (62kB) eps (22kB) pdf (9kB)
Figure 09b
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing only direct photons from the hard parton scattering. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (64kB) eps (22kB) pdf (9kB)
Figure 09c
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing only direct photons from the hard parton scattering. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (71kB) eps (24kB) pdf (9kB)
Figure 09d
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing only direct photons from the hard parton scattering. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (64kB) eps (22kB) pdf (9kB)
Figure 09e
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing only direct photons from the hard parton scattering. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (71kB) eps (23kB) pdf (8kB)
Figure 09f
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with PYTHIA containing only direct photons from the hard parton scattering. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (64kB) eps (22kB) pdf (9kB)
Figure 10a
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with SHERPA. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (63kB) eps (22kB) pdf (9kB)
Figure 10b
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with SHERPA. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (64kB) eps (22kB) pdf (9kB)
Figure 10c
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with SHERPA. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (64kB) eps (23kB) pdf (9kB)
Figure 10d
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with SHERPA. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (66kB) eps (23kB) pdf (9kB)
Figure 10e
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with SHERPA. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (66kB) eps (23kB) pdf (9kB)
Figure 10f
Top graphs: experimental (black dots) and theoretical (blue triangles) photon-jet production cross sections, for the three same-sign (a,c,e) and the three opposite-sign (b,d,f) angular configurations. The black error bars represent the total experimental uncertainty. The blue bands show the theoretical statistical uncertainties theoretical predictions obtained with SHERPA. Bottom graphs: ratio between the measured and the predicted cross sections. The blue bands show the theoretical statistical uncertainties while the error bars show the experimental uncertainties on the ratio. (a,b): |yjet| < 1.2. (c,d): 1.2 < |yjet| < 2.8. (e,f): 2.8 < |yjet| < 4.4.
png (66kB) eps (23kB) pdf (9kB)
Figure 11a
Summary of systematic uncertainties on the measured cross sections as a function of the photon ET in the central-jet (|y(jet)|<1.2), same-sign angular configuration.
png (52kB) eps (13kB) pdf (5kB)
Figure 11b
Summary of systematic uncertainties on the measured cross sections as a function of the photon ET in the central-jet (|y(jet)|<1.2), opposite-sign angular configuration.
png (52kB) eps (13kB) pdf (5kB)
Figure 11c
Summary of systematic uncertainties on the measured cross sections as a function of the photon ET in the forward-jet (1.2<|y(jet)|<2.8), same-sign angular configuration.
png (53kB) eps (13kB) pdf (5kB)
Figure 11d
Summary of systematic uncertainties on the measured cross sections as a function of the photon ET in the forward-jet (1.2<|y(jet)|<2.8), opposite-sign angular configuration.
png (53kB) eps (13kB) pdf (5kB)
Figure 11e
Summary of systematic uncertainties on the measured cross sections as a function of the photon ET in the very forward-jet (2.8<|y(jet)|<4.4), same-sign angular configuration.
png (52kB) eps (14kB) pdf (5kB)
Figure 11f
Summary of systematic uncertainties on the measured cross sections as a function of the photon ET in the very forward-jet (2.8<|y(jet)|<4.4), opposite-sign angular configuration.
png (53kB) eps (14kB) pdf (5kB)
