Energy dependence of direct-quarkonium production in pp collisions from fixed-target to LHC energies: complete one-loop analysis
文献类型：期刊论文
| 作者 | Feng Y(冯宇) ; Feng, Y; Wang JX(王建雄); Lansberg, JP; Wang, JX
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| 刊名 | EUROPEAN PHYSICAL JOURNAL C
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| 出版日期 | 2015 |
| 卷号 | 75期号:7页码:313 |
| 英文摘要 | 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. |
| 学科主题 | Physics |
| 类目[WOS] | Physics, Particles & Fields |
| 收录类别 | SCI ; CA |
| WOS记录号 | WOS:000357686300001 |
| 公开日期 | 2016-05-03 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/228594]  |
| 专题 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | 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. |
入库方式： OAI收割
来源：高能物理研究所
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