CERN Accelerating science

CERN Document Server 2,050 registres trobats  1 - 10següentfinal  anar al registre: La cerca s'ha fet en 3.85 segons. 
1.
Observation of double charm production involving open charm in pp collisions at s=7 TeV / LHCb collaboration
The production of J/ψ mesons accompanied by open charm, and of pairs of open charm hadrons are observed in pp collisions at a centre-of-mass energy of 7 TeV using an integrated luminosity of 355pb1 collected with the LHCb detector. Model independent measurements of absolute cross-sections are given together with ratios to the measured J/ψ and open charm cross-sections. [...]
arXiv:1205.0975; CERN-PH-EP-2012-109; LHCB-PAPER-2012-003; CERN-PH-EP-2012-109; LHCB-PAPER-2012-003.- 2012 - 41 p.
Addendum: PDF; Article from SCOAP3: PDF; Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
2.
Measurement of the forward energy flow in pp collisions at s= 7 TeV / LHCb Collaboration
The energy flow created in pp collisions at s=7 TeV is studied within the pseudorapidity range 1.9<eta<4.9 with data collected by the LHCb experiment. The measurements are performed for inclusive minimum-bias interactions, hard scattering processes and events with an enhanced or suppressed diffractive contribution. [...]
arXiv:1212.4755; CERN-PH-EP-2012-346; LHCB-PAPER-2012-034; CERN-PH-EP-2012-346; LHCB-PAPER-2012-034.- Geneva : CERN, 2013 - 17 p. - Published in : Eur. Phys. J. C 73 (2013) 2421 APS published version, local copy: PDF; Fulltext: PDF; Related data (files): ZIP; Springer Open Access article: PDF; External link: Rivet analyses reference
3.
Measurement of the B0sJ/ψˉK0 branching fraction and angular amplitudes / LHCb collaboration
A sample of 114±11 B0sJ/ψKπ+ signal events obtained with 0.37  fb1 of pp collisions at √s=7  TeV collected by the LHCb experiment is used to measure the branching fraction and polarization amplitudes of the B_s^0 → J/ψK̅ ^{*0} decay, with K̅ ^{*0} → K^-π^+. The K^-π^+ mass spectrum of the candidates in the B_s^0 peak is dominated by the K̅ ^{*0} contribution. [...]
arXiv:1208.0738; CERN-PH-EP-2012-214; LHCB-PAPER-2012-014; CERN-PH-EP-2012-214; LHCB-PAPER-2012-014.- 2012-10-08 - 16 p. - Published in : Phys. Rev. D 86 (2012) 071102 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
4.
Study of D_{sJ} decays to D^+K^0_{\rm S} and D^0K^+ final states in pp collisions / LHCb Collaboration
A study of D^+K_S^0 and D^0K^+ final states is performed in a sample of 1.0 fb^{-1} of pp collision data collected at a centre-of-mass energy of \sqrt{s}=7 TeV with the LHCb detector. We confirm the existence of the D_{s1}^*(2700)^+ and D_{sJ}^*(2860)^+ excited states and measure their masses and widths to be \begin{eqnarray} m(D_{s1}^*(2700)^+) &=& 2709.2 \pm 1.9(\mbox{stat})\pm\,\,\,4.5(\mbox{syst})~{\rm MeV}/c^2,\cr \Gamma(D_{s1}^*(2700)^+) &=& \,\,\,115.8 \pm 7.3(\mbox{stat}) \pm12.1(\mbox{syst})~{\rm MeV}/c^2,\cr m(D_{sJ}^*(2860)^+) &=& 2866.1 \pm 1.0(\mbox{stat}) \pm\,\,\,6.3(\mbox{syst})~{\rm MeV}/c^2,\cr \Gamma(D_{sJ}^*(2860)^+) &=& \,\,\,\,\,\,69.9 \pm 3.2(\mbox{stat}) \pm\,\,\,6.6(\mbox{syst})~{\rm MeV}/c^2.\cr\nonumber \end{eqnarray}
arXiv:1207.6016; CERN-PH-EP-2012-181; LHCB-PAPER-2012-016; CERN-PH-EP-2012-181; LHCB-PAPER-2012-016.- Geneva : CERN, 2012 - 12 p. - Published in : JHEP 10 (2012) 151 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
5.
First observation of the decay B^+ \to \pi^+ \mu^+\mu^- / LHCb Collaboration
A discovery of the rare decay B^{+} \rightarrow \pi^{+} \mu^{+} \mu^{-} is presented. This decay is observed for the first time, with 5.2 \sigma significance. [...]
arXiv:1210.2645; LHCB-PAPER-2012-020; CERN-PH-EP-2012-284; LHCB-PAPER-2012-020; CERN-PH-EP-2012-284.- Geneva : CERN, 2012 - 20 p. - Published in : JHEP 12 (2012) 125 Fulltext: PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Preprint
6.
Observation of B^0 \to \bar{D}^0 K^+ K^- and evidence of B^0_s \to \bar{D}^0 K^+ K^- / LHCb Collaboration
The first observation of the decay B^{0} \to \overline{D}^{0}K^{+}K^{-} is reported from an analysis of 0.62 \ \mathrm{fb}^{-1} of pp collision data collected with the LHCb detector. Its branching fraction is measured relative to that of the topologically similar decay B^{0} \to \overline{D}^{0}\pi^{+}\pi^{-} to be \frac{ {\cal B}\left(B^{0} \to \overline{D}^{0}K^{+}K^{-}\right)}{ {\cal B}\left(B^{0} \to \overline{D}^{0}\pi^{+}\pi^{-}\right)} = 0.056 \pm 0.011 \pm 0.007, where the first uncertainty is statistical and the second is systematic. [...]
arXiv:1207.5991; LHCB-PAPER-2012-018; CERN-PH-EP-2012-198; LHCB-PAPER-2012-018; CERN-PH-EP-2012-198.- Geneva : CERN, 2012-09-26 - 15 p. - Published in : Phys. Rev. Lett. 109 (2012) 131801 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; Supplementary data: ZIP; External link: Preprint
7.
Measurement of the C\!P asymmetry in B^0 \to K^{*0} \mu^+ \mu^- decays / LHCb Collaboration
A measurement of the C\!P asymmetry in B^0 \rightarrow K^{*0} \mu^+ \mu^- decays is presented, based on 1.0\mbox{\,fb}^{-1} of pp collision data recorded by the LHCb experiment during 2011. The measurement is performed in six bins of invariant mass squared of the \mu^+\mu^- pair, excluding the \mathrm{J}\mskip -3mu/\mskip -2mu\psi\mskip 2mu and \psi(2S) resonance regions. [...]
arXiv:1210.4492; LHCB-PAPER-2012-021; CERN-PH-EP-2012-302; LHCB-PAPER-2012-021; CERN-PH-EP-2012-302.- Geneva : CERN, 2013-01-17 - 8 p. - Published in : Phys. Rev. Lett. 110 (2013) 031801 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
8.
Measurement of the cross-section for Z\to e^+e^- production in pp collisions at \sqrt{s} =7 TeV / LHCb Collaboration
A measurement of the cross-section for pp \rightarrowZ \rightarrowe^+e^- is presented using data at \sqrt{s}=7 TeV corresponding to an integrated luminosity of 0.94 fb^{-1}. The process is measured within the kinematic acceptance p_{\mathrm{T}}>20GeV/c and 2<\eta<4.5 for the daughter electrons and dielectron invariant mass in the range 60-120 GeV/c^2. [...]
arXiv:1212.4620; CERN-PH-EP-2012-363; LHCB-PAPER-2012-036; CERN-PH-EP-2012-363; LHCB-PAPER-2012-036.- Geneva : CERN, 2013 - 22 p. - Published in : JHEP 02 (2013) 106 APS published version, local copy: PDF; Fulltext: arXiv:1212.4620 - PDF; LHCb-PAPER-2012-036 - PDF; Related data file(s): ZIP; Springer Open Access article: PDF; External link: Rivet analyses reference
9.
First observation of the decays \bar{B}^0_{(s)}\to D_s^+K^-\pi^+\pi^- and \bar{B}^0_s\to D_{s1}(2536)^+\pi^- / LHCb collaboration
The first observation of the decays \bar{B}^0_{s}\to D_s^+K^-\pi^+\pi^- and \bar{B}^0\to D_s^+K^-\pi^+\pi^- are reported using an integrated luminosity of 1.0 fb^{-1} recorded by the LHCb experiment. The branching fractions, normalized with respect to \bar{B}^0_{s}\to D_s^+\pi^-\pi^+\pi^- and \bar{B}^0_{s}\to D_s^+K^-\pi^+\pi^-, respectively, are measured to be \frac{B(\bar{B}^0_{s}\to D_s^+K^-\pi^+\pi^-)}{B(\bar{B}^0_{s}\to D_s^+\pi^-\pi^+\pi^-)} = (5.2\pm0.5\pm0.3)\times10^{-2}, \frac{B(\bar{B}^0\to D_s^+K^-\pi^+\pi^-)}{B(\bar{B}^0_{s}\to D_s^+K^-\pi^+\pi^-)} = 0.54\pm0.07\pm0.07, where the first uncertainty is statistical and the second is systematic. [...]
arXiv:1211.1541; LHCB-PAPER-2012-033; CERN-PH-EP-2012-327; LHCB-PAPER-2012-033; CERN-PH-EP-2012-327.- 2012 - 17 p. - Published in : Phys. Rev. D 86 (2012) 112005 APS Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint
10.
Measurement of the B^0--\bar B^0 oscillation frequency \Delta m_d with the decays B^0 \to D^- \pi^+ and B^0 \to J\ \psi K^{*0} / LHCb Collaboration
The B^0--\bar B^0 oscillation frequency \Delta m_d is measured by the LHCb experiment using a dataset corresponding to an integrated luminosity of 1.0\,fb^{-1} of proton-proton collisions at \sqrt{s} = 7\,TeV, and is found to be \Delta m_d = 0.5156 \pm 0.0051\,(stat.) \pm 0.0033\,(syst.)\,ps^{-1}. The measurement is based on results from analyses of the decays B^0 \to D^- \pi^+ (D^- \to K^+ \pi^- \pi^-) and B^0 \to J\ \psi K^{*0} (J\ \psi \to \mu^+ \mu^-, K^{*0} \to K^+ \pi^-) and their charge conjugated modes..
arXiv:1210.6750; LHCB-PAPER-2012-032; CERN-PH-EP-2012-315; LHCB-PAPER-2012-032; CERN-PH-EP-2012-315.- Geneva : CERN, 2013-07-16 - 8 p. - Published in : Phys. Lett. B 719 (2013) 318-325 APS published version, local copy: PDF; Elsevier Open Access article: PDF; Fulltext: PDF; Related data file(s): ZIP; External link: Preprint

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