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QCD corrections to polarization of J/psi and Upsilon at Fermilab Tevatron and CERN LHC
Gong B(龚斌); Wang JX(王建雄); Gong, G; Wang, JX
2008
发表期刊PHYSICAL REVIEW D
卷号78期号:7页码:74011
通讯作者[Gong, Bin] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China
文章类型Article
摘要In this work, we present more details of the calculation on the next-to-leading-order (NLO) QCD corrections to polarization of direct J/psi production via color singlet at the Tevatron and LHC, together with the results for Upsilon for the first time. Our results show that the J/psi polarization status drastically changes from transverse polarization dominant at leading order into longitudinal polarization dominant in the whole range of the transverse momentum p(t) of J/psi when the NLO corrections are counted. For Upsilon production, the p(t) distribution of the polarization status behaves almost the same as that for J/psi except that the NLO result is transverse polarization at small p(t) range. Although the theoretical evaluation predicts a larger longitudinal polarization than the measured value at the Tevatron, it may provide a solution towards the previous large discrepancy for J/psi and Upsilon polarization between theoretical prediction and experimental measurement, and suggests that the next important step is to calculate the NLO corrections to hadronproduction of color-octet state J/psi((8)) and Upsilon((8)). Our calculations are performed in two ways: namely, we do and do not analytically sum over the polarizations, and then check them with each other.
学科领域Astronomy & Astrophysics; Physics
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
DOI10.1103/PhysRevD.78.074011
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语种英语
研究领域[WOS]Astronomy & Astrophysics ; Physics ; Astronomy & Astrophysics ; Physics
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000260574800047
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/240778
专题理论物理室
作者单位中国科学院高能物理研究所
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Gong B,Wang JX,Gong, G,et al. QCD corrections to polarization of J/psi and Upsilon at Fermilab Tevatron and CERN LHC[J]. PHYSICAL REVIEW D,2008,78(7):74011.
APA 龚斌,王建雄,Gong, G,&Wang, JX.(2008).QCD corrections to polarization of J/psi and Upsilon at Fermilab Tevatron and CERN LHC.PHYSICAL REVIEW D,78(7),74011.
MLA 龚斌,et al."QCD corrections to polarization of J/psi and Upsilon at Fermilab Tevatron and CERN LHC".PHYSICAL REVIEW D 78.7(2008):74011.
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