Measurement of Quarkonium Production at Forward Rapidity in Pp Collisions at [square Root] PDF Download
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![Measurement of Quarkonium Production at Forward Rapidity in Pp Collisions at [square Root] PDF](https://books.google.com/books/content/images/frontcover/x6gJugEACAAJ?fife=w150-h200)
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Category : CERN LHC.
Languages : en
Pages : 27
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![Measurement of Quarkonium Production at Forward Rapidity in Pp Collisions at [square Root] PDF](https://books.google.com/books/content/images/frontcover/x6gJugEACAAJ?fife=w80-h100)
Author:
Publisher:
ISBN:
Category : CERN LHC.
Languages : en
Pages : 27
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Author: Andrew Chisholm
Publisher: Springer
ISBN: 3319231200
Category : Science
Languages : en
Pages : 193
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This thesis, which won one of the six 2015 ATLAS Thesis Awards, concerns the study of the charmonium and bottomonium bound heavy quark bound states. The first section of the thesis describes the observation of a candidate for the chi_b(3P) bottomonium states. This represented the first observation of a new particle at the LHC and its existence was subsequently confirmed by D0 and LHCb experiments. The second part of the thesis presents measurements of the prompt and non-prompt production of the chi_c1 and chi_c2 charmonium states in proton-proton collisions. These measurements are compared to several theoretical predictions and can be used to inform the development of theoretical models of quarkonium production.
![A Measurement of Botton Quark Production in Pp̄-collisions at [square Root Of] S PDF](https://books.google.com/books/content/images/frontcover/mLOE1ZZea08C?fife=w80-h100)
Author: Thorsten Bernhard Huehn
Publisher:
ISBN:
Category : Colliders (Nuclear physics)
Languages : en
Pages : 386
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Author: Andrew James Poll
Publisher:
ISBN:
Category :
Languages : en
Pages : 300
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Author:
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ISBN:
Category :
Languages : en
Pages : 21
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The top-quark pair production cross section is measured in final states with one electron or muon and one hadronically decaying [tau] lepton from the process $t\bar{t}$ to (l[nu]l) ([tau][nu][tau]) $b\bar{b}$, where l = e, [mu]. The data sample corresponds to an integrated luminosity of 19.6 fb-1 collected with the CMS detector in proton-proton collisions at $\sqrt{s}$ =8 TeV. The measured cross section [sigma]$t\bar{t}$ = 257 ± 3 (stat) ± 24 (syst) ± 7 (lumi) pb, assuming a top-quark mass of 172.5 GeV, is consistent with the standard model prediction.
![Measurement of Bottom Quark-antiquark Rapidity Correlations in Proton-antiproton Collisions at [square Root Of]s PDF](https://books.google.com/books/content/images/frontcover/Q9nQAAAAMAAJ?fife=w80-h100)
Author: James D. Olsen
Publisher:
ISBN:
Category :
Languages : en
Pages : 394
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Author: Andrew David York
Publisher:
ISBN:
Category : Mesons
Languages : en
Pages : 205
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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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Category :
Languages : en
Pages :
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The Upsilon production cross section in proton-proton collisions at sqrt(s) = 7 TeV is measured using a data sample collected with the CMS detector at the LHC, corresponding to an integrated luminosity of 3.1 +/- 0.3 inverse picobarns. Integrated over the rapidity range.
![Measurement of the Top Quark Pair Production Cross Section with 1.12 Fb−1 of Pp̄ Collisions at [square-root] S PDF](https://books.google.com/books/content/images/frontcover/Xu-ANwAACAAJ?fife=w80-h100)
Author: Daniel Joseph Sherman
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 502
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 39
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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.
