dorsal/arxiv
View SchemaBaryon, Charged Hadron, Drell-Yan and J/Psi Production in High Energy Proton-Nucleus Collisions
| Authors | Charles Gale, Sangyong Jeon, Joseph Kapusta |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9903073 |
| URL | https://arxiv.org/abs/nucl-th/9903073 |
| DOI | 10.1063/1.59575 |
Abstract
We show that the distributions of outgoing protons and charged hadrons in high energy proton-nucleus collisions are described rather well by a linear extrapolation from proton-proton collisions. The only adjustable parameter required is the shift in rapidity of a produced charged meson when it encounters a target nucleon. Its fitted value is 0.16. Next, we apply this linear extrapolation to precisely measured Drell-Yan cross sections for 800 GeV protons incident on a variety of nuclear targets which exhibit a deviation from linear scaling in the atomic number A. We show that this deviation can be accounted for by energy degradation of the proton as it passes through the nucleus if account is taken of the time delay of particle production due to quantum coherence. We infer an average proper coherence time of 0.4 +/- 0.1 fm/c, corresponding to a coherence path length of 8 +/- 2 fm in the rest frame of the nucleus. Finally, we apply the linear extrapolation to measured J/Psi production cross sections for 200 and 450 GeV/c protons incident on a variety of nuclear targets. Our analysis takes into account energy loss of the beam proton, the time delay of particle production due to quantum coherence, and absorption of the J/Psi on nucleons. The best representation is obtained for a coherence time of 0.5 fm/c, which is consistent with Drell-Yan production, and an absorption cross section of 3.6 mb, which is consistent with the value deduced from photoproduction of the J/Psi on nuclear targets.
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"abstract": "We show that the distributions of outgoing protons and charged hadrons in\nhigh energy proton-nucleus collisions are described rather well by a linear\nextrapolation from proton-proton collisions. The only adjustable parameter\nrequired is the shift in rapidity of a produced charged meson when it\nencounters a target nucleon. Its fitted value is 0.16. Next, we apply this\nlinear extrapolation to precisely measured Drell-Yan cross sections for 800 GeV\nprotons incident on a variety of nuclear targets which exhibit a deviation from\nlinear scaling in the atomic number A. We show that this deviation can be\naccounted for by energy degradation of the proton as it passes through the\nnucleus if account is taken of the time delay of particle production due to\nquantum coherence. We infer an average proper coherence time of 0.4 +/- 0.1\nfm/c, corresponding to a coherence path length of 8 +/- 2 fm in the rest frame\nof the nucleus. Finally, we apply the linear extrapolation to measured J/Psi\nproduction cross sections for 200 and 450 GeV/c protons incident on a variety\nof nuclear targets. Our analysis takes into account energy loss of the beam\nproton, the time delay of particle production due to quantum coherence, and\nabsorption of the J/Psi on nucleons. The best representation is obtained for a\ncoherence time of 0.5 fm/c, which is consistent with Drell-Yan production, and\nan absorption cross section of 3.6 mb, which is consistent with the value\ndeduced from photoproduction of the J/Psi on nuclear targets.",
"arxiv_id": "nucl-th/9903073",
"authors": [
"Charles Gale",
"Sangyong Jeon",
"Joseph Kapusta"
],
"categories": [
"nucl-th",
"hep-ph"
],
"doi": "10.1063/1.59575",
"title": "Baryon, Charged Hadron, Drell-Yan and J/Psi Production in High Energy Proton-Nucleus Collisions",
"url": "https://arxiv.org/abs/nucl-th/9903073"
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