Measurement Of The Prompt J Psi And Psi 2s Polarizations In Pp Collisions At Sqrt S
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Measurement Of The Prompt J Psi And Psi 2s Polarizations In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2013
Measurement Of The Prompt J Psi And Psi 2s Polarizations In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
J Psi And Psi 2s Production In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2012
J Psi And Psi 2s Production In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
A measurement of the J/psi and psi(2S) production cross sections in pp collisions at sqrt(s)=7 TeV with the CMS experiment at the LHC is presented. The data sample corresponds to an integrated luminosity of 37 inverse picobarns. Using a fit to the invariant mass and decay length distributions, production cross sections have been measured separately for prompt and non-prompt charmonium states, as a function of the meson transverse momentum in several rapidity ranges. In addition, cross sections restricted to the acceptance of the CMS detector are given, which are not affected by the polarization of the charmonium states. The ratio of the differential production cross sections of the two states, where systematic uncertainties largely cancel, is also determined. The branching fraction of the inclusive B to psi(2S) X decay is extracted from the ratio of the non-prompt cross sections to be: BR(B to psi(2S) X) = (3.08 +/- 0.12(stat.+syst.) +/- 0.13(theor.) +/- 0.42(BR[PDG])) 10-̂3.
Measurement Of Prompt Psi 2s To J Psi Yield Ratios In Pbpb And Pp Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of Prompt Psi 2s To J Psi Yield Ratios In Pbpb And Pp Collisions At Sqrt S Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
The ratio between the prompt psi(2S) and J/psi yields, reconstructed via their decays into muon pairs, is measured in PbPb and pp collisions at sqrt(s[NN]) = 2.76 TeV. The analysis is based on PbPb and pp data samples collected by CMS at the LHC, corresponding to integrated luminosities of 150 inverse microbarns and 5.4 inverse picobarns, respectively. The double ratio of measured yields, (N[psi(2S)]/N[J/psi])[PbPb] / (N[psi(2S)]/ N[J/psi])[pp], is computed in three PbPb collision centrality bins and two kinematic ranges: one at midrapidity, abs(y)
Measurement Of Prompt Psi 2s To J Psi Yield Ratios In Pb Pb And P P Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of Prompt Psi 2s To J Psi Yield Ratios In Pb Pb And P P Collisions At Sqrt S Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
The ratio between the prompt [psi](2S) and J/[psi] yields, reconstructed via their decays into [mu]+[mu]-, is measured in Pb-Pb and p-p collisions at √sNN=2.76 TeV. Likewise, the analysis is based on Pb-Pb and p-p data samples collected by CMS at the Large Hadron Collider, corresponding to integrated luminosities of 150 [mu]b-1 and 5.4 pb-1, respectively. The double ratio of measured yields (N[psi](2S)/NJ/[psi])Pb-Pb/(N[psi](2S)/NJ/[psi])p-p is computed in three Pb-Pb collision centrality bins and two kinematic ranges: one at midrapidity,
Measurement Of The Psi 2s Polarization In Pp Collisions At The Square Root Of S
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Author : Ching-Yuk Paul Ngan
language : en
Publisher:
Release Date : 2001
Measurement Of The Psi 2s Polarization In Pp Collisions At The Square Root Of S written by Ching-Yuk Paul Ngan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001 with categories.
We present a measurement of the polarization of [psi](2S) mesons produced in pp̄ collisions at [the square root of]s = 1.8 TeV with the CDF detector at Fermilab. This measurement is a sensitive test of the calculations based on the Non-relativistic QCD (NRQCD) factorization mechanism, which are able to account for the unexpectedly large cross section for charmonium production in pp̄ collisions (roughly a factor 50 above the Color Singlet Model). These calculations also predict that directly produced charmonia should approach 100% transverse polarization for high transverse momentum of the onium state. We consider [psi](2S) mesons, reconstructed using the decay mode [psi](2S) [right arror] [mu]+ [mu]- in a 110 pb-1 data sample of pp̄ collisions. The polarization of prompt [psi](2S) is extracted to be -0.54 +/- 0.48(stat.) +/- 0.04(syst.) for 9
Measurement Of Prompt J Psi Pair Production In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of Prompt J Psi Pair Production In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
Production of prompt J/[psi] meson pairs in proton-proton collisions at √s = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb-1. The two J/[psi] mesons are fully reconstructed via their decays into [mu] + [mu] - pairs. This observation provides for the first time access to the high-transverse-momentum region of J/[psi] pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/[psi] transverse momentum (p T J/[psi] ) and rapidity (
Relative Modification Of Prompt Psi Mathrm 2s And Mathrm J Psi Yields From Pp To Pbpb Collisions At Sqrt S Mathrm Nn
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Author :
language : en
Publisher:
Release Date : 2016
Relative Modification Of Prompt Psi Mathrm 2s And Mathrm J Psi Yields From Pp To Pbpb Collisions At Sqrt S Mathrm Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The relative modification of the prompt psi(2S) and J/psi yields from pp to PbPb collisions, at the center of mass energy of 5.02 TeV per nucleon pair, is presented. The analysis is based on pp and PbPb data samples collected by the CMS experiment at the LHC in 2015, corresponding to integrated luminosities of 28.0 inverse picobarns and 464 inverse microbarns, respectively. The double ratio of measured yields of prompt charmonia reconstructed through their decays into muon pairs, (N[psi(2S)]/N[J/psi])[PbPb]/ (N[psi(2S)]/N[J/psi])[pp], is determined as a function of PbPb collision centrality and charmonium transverse momentum pt, in two kinematic intervals: abs(y)
Measurement Of Prompt And Nonprompt J Psi Production In Pp And Ppb Collisions At Sqrt S Nn
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Author :
language : en
Publisher:
Release Date : 2017
Measurement Of Prompt And Nonprompt J Psi Production In Pp And Ppb Collisions At Sqrt S Nn written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
This paper reports the measurement of J/psi meson production in proton-proton (pp) and proton-lead (pPb) collisions at a center-of-mass energy per nucleon pair of 5.02 TeV by the CMS experiment at the LHC. The data samples used in the analysis correspond to integrated luminosities of 28 inverse picobarns and 35 inverse nanobarns for pp and pPb collisions, respectively. Prompt and nonprompt J/psi mesons, the latter issuing from the decay of B mesons, are measured in their dimuon decay channels. Differential cross sections are measured in the transverse momentum range of 2
Measurement Of The Prompt J Psi Pair Production Cross Section In Pp Collisions At Sqrt S
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Author : Grant Valentine Riley
language : en
Publisher:
Release Date : 2017
Measurement Of The Prompt J Psi Pair Production Cross Section In Pp Collisions At Sqrt S written by Grant Valentine Riley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with Collisions (Nuclear physics) categories.
The cross section for the prompt production of [J/Psi] meson pairs in proton-proton collisions at √ s[sqrt(s)] = 8 TeV at the LHC from a sample corresponding to an integrated luminosity of 20.2±0.5 fb−1 [inverse femtobarns] has been measured with the CMS detector. It provides unique insight into particle production and proton structure in proton-proton (pp) collisions. The two [J/Psi] mesons are fully reconstructed in their [mu+ mu-] decay. An acceptance region is defined by the individual [J/Psi] transverse momentum p [J/Psi pT] and rapidity y [J/Psi Rapidity]. The total fiducial cross section assuming unpolarized prompt [J/Psi] pair production is found to be [sigma_fid] = 195.7 ± 11.1 (stat) ± 22.1 (syst) ± 5.1 (lumi) ± 2.3 (BF) pb. The differential cross sections for prompt [J/Psi] pair production within this acceptance region are measured in eight event variables. Most predictions for particle production in pp collisions at the LHC assume dominance of single parton (gluon, quark) interactions (SPS) at the leading order perturbation theory. This assumption is tested with the final state measured in this analysis. Significant contributions from next-to-leading order processes and double parton scattering (DPS) are observed. In addition, the single [J/Psi] production cross section is estimated from theory and measured with pp collision data. Single [J/Psi] production is compared to the pair production via DPS and quantified via an effective cross section. This quantity is further compared to several particle pair production processes. In particular, the [J/Psi] pair production probes the contributions of gluons. All particle production measurements with CMS depend on the precise knowledge of the LHC luminosity. A detector, the Pixel Luminosity Telescope, based on solid state technology is used to count charged particle tracks from pp collisions, a measure of the instantaneous luminosity. The measurement is provided online for every crossing of the LHC beams. Tests of sensors and the development work for the detector are presented.
Prompt And Non Prompt J Psi Production In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Prompt And Non Prompt J Psi Production In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
The production of J/psi mesons is studied in pp collisions at sqrt(s)=7 TeV with the CMS experiment at the LHC. The measurement is based on a dimuon sample corresponding to an integrated luminosity of 314 inverse nanobarns. The J/psi differential cross section is determined, as a function of the J/psi transverse momentum, in three rapidity ranges. A fit to the decay length distribution is used to separate the prompt from the non-prompt (b hadron to J/psi) component. Integrated over J/psi transverse momentum from 6.5 to 30 GeV/c and over rapidity in the range.