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η_c collaboration with γ produced during nuclear effects

Author: GuHuiYing
Tutor: DuanChunGui
School: Hebei Normal
Course: Theoretical Physics
Keywords: Nuclear effects Generating process Deep inelastic scattering Heavy quarkonium Experimental Data Evolution equation Nuclear Hadron Sub- distribution function Overfitting
CLC: O571
Type: Master's thesis
Year: 2005
Downloads: 6
Quote: 0
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Abstract


In this paper, the nuclear effects of the bound nucleon structure are reviewed, two sets of nuclear parton distribution functions are introduced. In 1998, K. J. Eskola et al. used the nuclear structure function ratios from deep-inelastic lepton-nucleus deep inelastic scattering (DIS), and the E772 Drell-Yan experimental data, gave the nuclear partondistribution functions in the range 2.25GeV2 < Q2 < 10000GeV2, 10-6 ≤ x ≤ 1 , A ≥ 2 by means of the DGLAP evolution equation. In 2001, M. Hirai et al. proposed nuclear parton distribution functions at A≥1,Q20 =1GeV2 and 10-9 ≤x≤1 by the x2analyzing of the experimental data on electron-nuclear deep inelastic scattering. Then using the DGLAP evolution equations, they obtained the nuclear parton distributions at1GeV2 <Q2 <105GeV2.The conventional quarkonium production has been studied in the color-singlet model (CSM), which assumes the heavy-quark pair is produced in a color-singlet state with the right quantum numbers of the final heavy quarkonium. But the CSM underestimates directJ/ψ production by a factor of 30 to 80 for 5GeV <pT <18GeV. Recently, the theoryabout the heavy quarkonium production has developed greatly, color-octet mechanism is proposed. It accord with the experimental data very well.In 1999, Hao et al. studied the photo-production of ηc, which is a pure color-octetprocess. We calculated the cross section of the associated ηc and γ in thehardon-nuclear collision, using the EKS98, HKM01 and HKN04 nuclear parton distributions. So comparing our theoretical result with the future experimental data, we can pin down the gluon distribution in bound nucleons.

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CLC: > Mathematical sciences and chemical > Physics > Nuclear physics,high energy physics > Nuclear physics
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