An updated study of Upsilon production and polarization at the Tevatron and LHC

	An updated study of Upsilon production and polarization at the Tevatron and LHC
	Feng Y(冯宇); Gong B(龚斌); Wan LP(万露萍); Wang JX(王建雄); Feng; Y; Gong; B; Wan; LP
刊名	CHINESE PHYSICS C
	2015
卷号	39 期号:12 页码:123102
关键词	non-relativistic quantum chromodynamics next-to-leading order Upsilon chi(bJ) feed-down contributions polarization
通讯作者	冯宇 ; 龚斌 ; 万露萍 ; 王建雄
英文摘要	Following the nonrelativistic QCD factorization scheme, by taking the latest available measurements of chi(bJ) (3P) into consideration, we present an updated study on the yield and polarization of Upsilon(1S, 2S, 3S) hadroproduction, and the fractions of chi(bJ) (MP) feed-down in Upsilon(nS) production at QCD next-to-leading order. In the fitting, three schemes are applied with different choices of chi(bJ)(mP) feed-down ratios and NRQCD factorization scale. The results can explain the measurements of yield very well. The polarization puzzle to Upsilon(3S) is now solved by considering the chi(bJ)(3P) feed-down contributions. The ratio of sigma[chi(b2)(1P)]/sigma[chi(b1)(1P)] measured by the CMS experiment can also be reproduced in our prediction. Among the different schemes, the results show little difference, but there are sizeable differences for the fitted long-distance color-octet matrix elements. This may bring large uncertainties when the values are applied in theoretical predictions for other experiments such as those at ee, ep colliders.
学科主题	Physics
类目[WOS]	Physics, Nuclear ; Physics, Particles & Fields
收录类别	SCI ; CA
WOS记录号	WOS:000367418600005
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/229050]
专题	高能物理研究所_理论物理室
推荐引用方式 GB/T 7714	Feng Y,Gong B,Wan LP,et al. An updated study of Upsilon production and polarization at the Tevatron and LHC[J]. CHINESE PHYSICS C,2015,39(12):123102.
APA	冯宇.,龚斌.,万露萍.,王建雄.,Feng.,...&JX.(2015).An updated study of Upsilon production and polarization at the Tevatron and LHC.CHINESE PHYSICS C,39(12),123102.
MLA	冯宇,et al."An updated study of Upsilon production and polarization at the Tevatron and LHC".CHINESE PHYSICS C 39.12(2015):123102.