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Energy dependence of direct-quarkonium production in pp collisions from fixed-target to LHC energies: complete one-loop analysis
Feng Y(冯宇); Feng, Y; Wang JX(王建雄); Lansberg, JP; Wang, JX
2015
发表期刊EUROPEAN PHYSICAL JOURNAL C
卷号75期号:7页码:313
摘要We compute the energy dependence of the P-T-integrated cross section of directly produced quarkonia in pp collisions at next-to-leading order (NLO), namely up to alpha(3)(S), within nonrelativistic QCD (NRQCD), treating the P-T-integrated and the P-T-differential cross sections as two different observables. The colour-octet NRQCD parameters needed to predict the P-T-integrated yield can thus be extracted from the fits of the P-T-differential cross sections at mid and large PT. For the first time, the total cross section is evaluated in NRQCD at full NLO accuracy using the recent NLO fits of the P-T-differential yields. Both the normalisation and the energy dependence of the J/psi, psi' and gamma(1S) we obtained disagree with the data except when using the fit results of Butenschoen and Kniehl. If one disregards the colour-octet contribution, the existing data in the TeV range are well described by the alpha(3)(S) contribution in the colour-singlet model - which, at alpha(4)(S), however, shows an unphysical energy dependence. A similar observation is made for eta(c,b). All this underlines the necessity for a resummation of initial-state radiations in both channels, which is, however, beyond the scope of this article. In any case, past claims that colour-octet transitions are dominantly responsible for low-P-T quarkonium production are not supported by our results.
文章类型Article
学科领域Physics
DOI10.1140/epjc/s10052-015-3527-1
收录类别SCI ; CA
WOS类目Physics, Particles & Fields
WOS记录号WOS:000357686300001
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被引频次:12[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/228594
专题理论物理室
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Feng Y,Feng, Y,Wang JX,et al. Energy dependence of direct-quarkonium production in pp collisions from fixed-target to LHC energies: complete one-loop analysis[J]. EUROPEAN PHYSICAL JOURNAL C,2015,75(7):313.
APA 冯宇,Feng, Y,王建雄,Lansberg, JP,&Wang, JX.(2015).Energy dependence of direct-quarkonium production in pp collisions from fixed-target to LHC energies: complete one-loop analysis.EUROPEAN PHYSICAL JOURNAL C,75(7),313.
MLA 冯宇,et al."Energy dependence of direct-quarkonium production in pp collisions from fixed-target to LHC energies: complete one-loop analysis".EUROPEAN PHYSICAL JOURNAL C 75.7(2015):313.
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