J/PSI Production Via Chi Sub C Decays in Fixed Target Proton-nucleus Collisions PDF Download
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Languages : en
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In the last decades, the mechanism of production of heavy quarkonium states has been the subject of research efforts involving both theoretical and experimental developments. Even though the predictions of the presently accepted models differ, the amount of experimental data does not allow for a determination of the best suited theory. The particular case of charmonium production in hadron collisions is an attractive test case as the charm is heavy enough to allow for perturbative calculations of the production process, and yet the cross sections involved are large enough so that events can be measured with good statistics. The data collected at the HERA-B detector after the HERA-II upgrade is analyzed and used to estimate the fraction of J/Psi produced via radiative Chi sub c decays. The result is compared to theoretical predictions and it is found to agree with calculations based on the color evaporation model and with the calculations using the non-relativistic quantum chromodynamics model.
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Languages : en
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Book Description
In the last decades, the mechanism of production of heavy quarkonium states has been the subject of research efforts involving both theoretical and experimental developments. Even though the predictions of the presently accepted models differ, the amount of experimental data does not allow for a determination of the best suited theory. The particular case of charmonium production in hadron collisions is an attractive test case as the charm is heavy enough to allow for perturbative calculations of the production process, and yet the cross sections involved are large enough so that events can be measured with good statistics. The data collected at the HERA-B detector after the HERA-II upgrade is analyzed and used to estimate the fraction of J/Psi produced via radiative Chi sub c decays. The result is compared to theoretical predictions and it is found to agree with calculations based on the color evaporation model and with the calculations using the non-relativistic quantum chromodynamics model.
![Kinematic Distributions and Nuclear Effects of J/ψ [J-psi] Production in 920 GeV Fixed-target Proton-nucleus Collisions PDF](https://books.google.com/books/content/images/frontcover/HLrIzQEACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages : 19
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![Kinematic Distributions and Nuclear Effects of J/_y63 [J-psi] Production in 920 GeV Fixed-target Proton-nucleus Collisions PDF](https://books.google.com/books/content/images/frontcover/diEpPwAACAAJ?fife=w80-h100)
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Languages : en
Pages : 19
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![Hadronic Production of J/[psi] at Large [chi]{sub F} in 800 GeV P+Cu and P+Be Collisions PDF](https://books.google.com/books/content/images/frontcover/clFsAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 110
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The differential cross-section d[sigma]/dx[sub F] for J/[psi] production in 800 GeV proton-nucleus collisions has been measured in the kinematic range 0.30 [le] x[sub F] [le] 0.95 and x[sub F] [lt] p[perpendicular] [lt] 5 GeV through the decay mode J/[psi] [yields] [mu][sup +][mu][sup [minus]]. The nuclear dependence of J/[psi] production over this range was measured using copper and beryllium targets. The differential cross sections are in good agreement with the predictions of the symbolical parton duality model. The data show no evidence for an intrinsic charm component in the proton. The ratio of the differential cross sections for copper and beryllium shows a suppression of J/[psi] production in copper which increases with increasing x[sub F].
Author: Paul A. Draper
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Category : Collisions (Nuclear physics)
Languages : en
Pages : 438
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![Measurement of the J/[psi] Production Cross Section in 920 GeV/c Fixed-target Proton-nucleus Interactions PDF](https://books.google.com/books/content/images/frontcover/HrmutgAACAAJ?fife=w80-h100)
Author: HERA B Collaboration
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Languages : en
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Languages : en
Pages : 8
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In this talk the author shows the results of a fit of the NRQCD matrix elements to the CDF data for direct J/[psi] production, by including the radiative corrections to the g g → 3 S 1{sup [1]} channel and the effect of the k{sub T}-smearing. Furthermore he performs the NLO NRQCD analysis of J/[psi] production in fixed-target proton-nucleon collisions and he fits the colour-octet matrix elements to the available experimental data. The results are compared to the Tevatron ones.
![Production of J/[Psi] From[chi][sub C] Decays at CDF. PDF](https://books.google.com/books/content/images/frontcover/tQT9jwEACAAJ?fife=w80-h100)
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Languages : en
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We have measured the fraction of J/[psi] originating from[chi][sub c] states in p[bar p] collisions at[radical]s= 1.8 TeV in four bins of J/[psi] P[sub T]. The fraction in the inclusive CDF J/[psi] sample with P[sub T][sup J/[psi]]> 4.0 GeV/c and[vert-bar][eta][sup J/[psi]][vert-bar]
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Category :
Languages : en
Pages : 6
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A review of J / [psi] and [psi]' production (charmonium) in proton-nucleus collisions is given including results from measurements at fixed target experiments at both Fermilab (E866/NuSea) and CERN (NA50) and some discussion of planned measurements at RHIC and NA60. The important physics that contributes to the large suppression in production of charmonium will be discussed as will be information from complementary measurements of open-charm production, and the Drell-Yan process. The differences in the results from Fermilab and CERN and the evolution of this physics to RHIC energies will be shown. The importance of a clear understanding of these effects in order to use J / [psi] suppression as a tool for study of the Quark-gluon plasma in nucleus-nucleus collisions at RHIC will be highlighted.
Author: Matthew Scott Kowitt
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Category :
Languages : en
Pages : 248
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