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1.
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Measurement of radiative widths of $a_2(1320)$ and $\pi_2(1670)$
/ COMPASS Collaboration
The COMPASS Collaboration at CERN has investigated the reaction $\pi^- \gamma \rightarrow \pi^-\pi^-\pi^+$ embedded in the Primakoff reaction of $190~\textrm{GeV}$ pions scattering in the Coulomb field of a lead target, $\pi^- \text{Pb} \rightarrow \pi^-\pi^-\pi^+ \text{Pb}$. Exchange of quasi-real photons is selected by isolating the sharp Coulomb peak observed at momentum transfer below $0.001~(\text{GeV}/c)^2$. [...]
arXiv:1403.2644; CERN-PH-EP-2014-041; CERN-PH-EP-2014-041.-
Geneva : CERN, 2014 - 19 p.
- Published in : Eur. Phys. J. A 50 (2014) 79
Draft (restricted): PDF; Fulltext: CERN-PH-EP-2014-041 - PDF; arXiv:1403.2644 - PDF; External link: Preprint
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2.
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3.
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Measurement of azimuthal hadron asymmetries in semi-inclusive deep inelastic scattering off unpolarised nucleons
/ COMPASS Collaboration
Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced in deep inelastic scattering were measured using the CERN SPS muon beam at $160$ GeV/c and a $^6$LiD target. The amplitudes of the three azimuthal modulations $\cos\phi_h$, $\cos2\phi_h$ and $\sin\phi_h$ were obtained binning the data separately in each of the relevant kinematic variables $x$, $z$ or $p_T^{\,h}$ and binning in a three-dimensional grid of these three variables. [...]
arXiv:1401.6284; CERN-PH-EP-2014-009; CERN-PH-EP-2014-009.-
Geneva : CERN, 2014-09 - 32 p.
- Published in : Nucl. Phys. B 886 (2014) 1046-1077
Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: CERN-PH-EP-2014-009 - PDF; arXiv:1401.6284 - PDF; S0550321314002387 - XML;
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4.
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Transverse target spin asymmetries in exclusive $\rho^0$ muoproduction
/ COMPASS Collaboration
Exclusive production of $\rho^0$ mesons was studied at the COMPASS experiment by scattering 160 GeV/$c$ muons off transversely polarised protons. Five single-spin and three double-spin azimuthal asymmetries were measured as a function of $Q^2$, $x_{Bj}$, or $p_{T}^{2}$. [...]
arXiv:1310.1454; CERN-PH-EP-2013-191; CERN-PH-EP-2013-191.-
Geneva : CERN, 2014-04-04 - 8 p.
- Published in : Phys. Lett. B 731 (2014) 19-26
Article from SCOAP3: PDF; Draft (restricted): PDF; Elsevier Open Access article: PDF; Fulltext: CERN-PH-EP-2013-191 - PDF; arXiv:1310.1454 - PDF; S0370269314000963 - XML;
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5.
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Hadron Transverse Momentum Distributions in Muon Deep Inelastic Scattering at 160 GeV/$c$
/ COMPASS Collaboration
Multiplicities of charged hadrons produced in deep inelastic muon scattering off a $^6$LiD target have been measured as a function of the DIS variables $x_{Bj}$, $Q^2$, $W^2$ and the final state hadron variables $p_T$ and $z$. The $p_T^2$ distributions are fitted with a single exponential function at low values of $p_T^2$ to determine the dependence of $\langle p_T^2 \rangle$ on $x_{Bj}$, $Q^2$, $W^2$ and $z$. [...]
arXiv:1305.7317; CERN-PH-EP-2013-091; CERN-PH-EP-2013-091.-
Geneva : CERN, 2013-08-23 - 18 p.
- Published in : Eur. Phys. J. C
Article from SCOAP3: PDF; Fulltext: PDF; Springer Open Access Erratum: PDF; External link: Preprint
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6.
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7.
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Fast Photon Detection for COMPASS RICH1
/ Abbon, P (DSM, DAPNIA, Saclay) ; Alekseev, M (INFN, Turin ; Turin U.) ; Angerer, H (Munich, Tech. U.) ; Apollonio, M (INFN, Trieste ; Trieste U.) ; Birsa, R (INFN, Trieste ; Trieste U.) ; Bordalo, P (Lisbon, LIFEP) ; Bradamante, F (INFN, Trieste ; Trieste U.) ; Bressan, A (INFN, Trieste ; Trieste U.) ; Busso, L (INFN, Turin ; Turin U.) ; Chiosso, M (INFN, Turin ; Turin U.) et al.
The new photon detection system for COMPASS RICH-1 has been designed to cope with the demanding requests of operation at high beam intensity and at high trigger rates. The detection technique in the central region of RICH-1 has been changed with a system based on multianode photomultipliers coupled to individual fused silica lens telescopes and to a fast, almost dead time free readout system based on the MAD-4 amplifier-discriminator and the F1 TDC-chip. [...]
2006 - 8 p.
- Published in : Czechoslov. J. Phys. 56 (2006) F317
Fulltext: PDF;
In : Advanced Studies Institution Symmetries and Spin, Prague, Czech Republic, 19 - 26 Jul 2006, pp.317
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8.
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Optical telescopes for COMPASS RICH1 up-grade
/ Sulc, M (Liberec Tech. U.) ; Abbon, P (DSM, DAPNIA, Saclay) ; Alekseev, M (INFN, Turin ; Turin U.) ; Angerer, H (Munich, Tech. U.) ; Appolonio, M (INFN, Trieste ; Trieste U.) ; Birsa, R (INFN, Trieste ; Trieste U.) ; Bordalo, P (Lisbon, LIFEP) ; Bradamante, F (INFN, Trieste ; Trieste U.) ; Bressan, A (INFN, Trieste ; Trieste U.) ; Busso, L (INFN, Turin ; Turin U.) et al.
The central photon detection area of the Ring Imaging Cherenkov detector at COMPASS, a particle physics experiment at CERN SPS dedicated to hadron physics, has been upgraded from the previous system formed by wire chambers with CsI layers to a very fast UV extended multi anode photo multiplier tube array (MAPMT), including 576 tubes. The active area covered by the MAPMTs is 7.3 times smaller than the one previously equipped with CsI photocathodes, so 576 optical concentrators transforming the image from the old system focal plane to the new photocathode plane were needed. [...]
2006 - 8 p.
- Published in : Czechoslov. J. Phys. 56 (2006) F325
Fulltext: PDF;
In : Advanced Studies Institution Symmetries and Spin, Prague, Czech Republic, 19 - 26 Jul 2006, pp.325
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9.
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Hartmann test of the COMPASS RICH-1 optical telescopes
/ Polak, J (Liberec Tech. U.) ; Abbon, P (DSM, DAPNIA, Saclay) ; Alekseev, M (INFN, Turin ; Turin U.) ; Angerer, H (Munich, Tech. U.) ; Apollonio, M (Trieste U. ; INFN, Trieste) ; Birsa, R (Trieste U. ; INFN, Trieste) ; Bordalo, P (Lisbon, LIFEP) ; Bradamante, F (Trieste U. ; INFN, Trieste) ; Bressan, A (Trieste U. ; INFN, Trieste) ; Busso, L (INFN, Turin ; Turin U.) et al.
The central region of COMPASS RICH-1 has been equipped with a new photon detection system based on MultiAnode PhotoMultiplier Tubes (MAPMT). The Cherenkov photons are focused by an array of 576 fused silica telescopes onto 576 MAPMTs. [...]
2008 - 6 p.
- Published in : Czechoslov. J. Phys. 56 (2006) F333
Fulltext: PDF;
In : Advanced Studies Institution Symmetries and Spin, Prague, Czech Republic, 19 - 26 Jul 2006, pp.333
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