Obtaining the nuclear gluon distribution from heavy quark decaysto lepton pairs in pA collisions

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We have studied how lepton pairs from decays of heavy-flavoured mesons produced in pA collisions can be used to determine the modifications of the gluon distribution in the nucleus. Since heavyquark production is dominated by the gg channel, the ratio of correlated lepton pair cross sections from DD-bar and BB-bar decays in pA and pp collisions directly reflects the ratio R{sub g}A= f{sub g}A/f{sub g}p. We have numerically calculated the lepton pair cross sections from these decays in pp and pA collisions at SPS, RHIC and LHC energies. We find that ratio of the pA to pp cross sections agrees ... continued below

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Eskola, K.J.; Kolhinen, V.J. & Vogt, R. May 10, 2001.

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We have studied how lepton pairs from decays of heavy-flavoured mesons produced in pA collisions can be used to determine the modifications of the gluon distribution in the nucleus. Since heavyquark production is dominated by the gg channel, the ratio of correlated lepton pair cross sections from DD-bar and BB-bar decays in pA and pp collisions directly reflects the ratio R{sub g}A= f{sub g}A/f{sub g}p. We have numerically calculated the lepton pair cross sections from these decays in pp and pA collisions at SPS, RHIC and LHC energies. We find that ratio of the pA to pp cross sections agrees quite well with the input R{sub g}A. Thus, sufficiently accurate measurements could be used to determine the nuclear modification of the gluon distribution over a greater range of x and Q2 than presently available, putting strong constraints on models.

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  • Journal Name: Nuclear Physics A; Journal Volume: 696; Journal Issue: 3-4; Related Information: Journal Publication Date: 12/31/2001

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  • Report No.: LBNL--47714
  • Grant Number: DE-AC02-05CH11231
  • DOI: 10.1016/S0375-9474(01)01221-0 | External Link
  • Office of Scientific & Technical Information Report Number: 860720
  • Archival Resource Key: ark:/67531/metadc788181

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  • May 10, 2001

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  • Dec. 3, 2015, 9:30 a.m.

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  • Sept. 1, 2016, 7:05 p.m.

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Eskola, K.J.; Kolhinen, V.J. & Vogt, R. Obtaining the nuclear gluon distribution from heavy quark decaysto lepton pairs in pA collisions, article, May 10, 2001; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc788181/: accessed August 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.