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Measurement Of J Psi Production In Continuum Esup Esup Annihilations Near Sqrts
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Book Synopsis Measurement of J/psi Production in Continuum Ee− Annihilations Near Sqrt(s) by :
Download or read book Measurement of J/psi Production in Continuum Ee− Annihilations Near Sqrt(s) written by and published by . This book was released on 2001 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The production of J/[psi] mesons in continuum ee− annihilations has been studied with the BABAR detector at energies near the [Upsilon](4S) resonance, approximately 10.6 GeV. The mesons are distinguished from J/[psi] production in B decays through their center-of-mass momentum and energy. We measure the cross section ee− 2!J/[psi] X to be 2.52 ± 0.21 ± 0.21 pb; for momentum above 2 GeV/c, it is 1.87 ± 0.10 ± 0.15 pb. We set a 90% confidence level upper limit on the branching fraction for direct [Upsilon](4S) 2!J/[psi] X decays at 4.3 x 10−4.
Book Synopsis Measurement of J/psi Production in Continuum E[sup+]e[sup -] Annihilations Near Sqrt(s) by :
Download or read book Measurement of J/psi Production in Continuum E[sup+]e[sup -] Annihilations Near Sqrt(s) written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The production of J/[psi] mesons in continuum e[sup+]e[sup -] annihilations has been studied with the BABAR detector at energies near the[Upsilon](4S) resonance, approximately 10.6 GeV. The mesons are distinguished from J/[psi] production in B decays through their center-of-mass momentum and energy. We measure the cross section e[sup+]e[sup -][yields] J/[psi] X to be 2.52[+-] 0.21[+-] 0.21 pb; for momentum above 2 GeV/c, it is 1.87[+-] 0.10[+-] 0.15 pb. We set a 90% confidence level upper limit on the branching fraction for direct[Upsilon](4S)[yields] J/[psi] X decays at 4.3 x 10[sup -4].
Book Synopsis Measurement of Prompt and Nonprompt J/psi Production in Pp and PPb Collisions at Sqrt(s[NN] by :
Download or read book Measurement of Prompt and Nonprompt J/psi Production in Pp and PPb Collisions at Sqrt(s[NN] written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Book Synopsis J/psi and Psi(2S) Production in Pp Collisions at Sqrt(s) by :
Download or read book J/psi and Psi(2S) Production in Pp Collisions at Sqrt(s) written by and published by . This book was released on 2012 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Measurement of the Prompt Double J/psi Production Cross Section in Pp Collisions at Sqrt(s) by : Andrew David York
Download or read book Measurement of the Prompt Double J/psi Production Cross Section in Pp Collisions at Sqrt(s) written by Andrew David York and published by . This book was released on 2013 with total page 205 pages. Available in PDF, EPUB and Kindle. Book excerpt: The simultaneous production of two J/psi mesons has been significantly observed in proton-proton collisions at a center-of-mass energy of 7 TeV with the CMS detector. The two J/psi mesons are fully reconstructed in their decay to muons. The signal yield is extracted with an extended maximum likelihood fit based on four event variables. A method was developed to correct for detector acceptances and efficiencies based on the measured momenta of the J/psi and their decay muons to maintain the least model dependence possible. The measurement is performed in an acceptance region defined by the individual J/psi transverse momentum and rapidity. From the measured signal yield of 446 events corresponding to an integrated luminosity of 4:7 inverse femtobarn. The total cross section is found to be 1:49 nanobarn, with 0:07 statistical and 0:13 nb systematic error, and unpolarizaed production was assumed. Most predictions for particle production at the LHC assume dominance of single parton interaction for proton-proton collisions, which can be tested with the final state measured in this analysis. The differential cross section is measured in bins of the double J/psi invariant mass, the double J/psi transverse momentum, and the absolute difference in rapidity of the two J/psi. The reconstruction of the four charged muon trajectories heavily relies on the Pixel subdetector located close to the beampipe. Systematic studies with cosmic muons and tracks from collision events are presented. The development of the Pixel RawToDigi package, data quality monitoring packages, commissioning studies of Pixel data and tracks in first collisions, and realistic simulations of decay signals in the pixel subdetector were all performed as a part of this dissertation work.
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