Can Nonrelativistic QCD Explain the gamma gamma* -> eta(c) Transition Form Factor Data?

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	*Can Nonrelativistic QCD Explain the gamma gamma -> eta(c) Transition Form Factor Data?**
	Feng, F; Jia, Y; Sang, WL
刊名	PHYSICAL REVIEW LETTERS
	2015
卷号	115 期号:22 页码:222001
通讯作者	Feng, F (reprint author), China Univ Min & Technol, Beijing 100083, Peoples R China.
英文摘要	Unlike the bewildering situation in the gamma gamma* -> pi form factor, a widespread view is that perturbative QCDcan decently account for the recentBABAR measurement of the gamma gamma* ->eta(c) transition formfactor. The nextto- next-to-leading-order perturbative correction to the gamma gamma* ->eta(c,b) form factor, is investigated in the nonrelativistic QCD (NRQCD) factorization framework for the first time. As a byproduct, we obtain, by far, the most precise order-alpha(2)(s) NRQCD matching coefficient for the eta(c,b) -> gamma gamma process. After including the substantial negative order-alpha(2)(s) correction, the good agreement between NRQCD prediction and the measured gamma gamma* ->eta(c) form factor is completely ruined over a wide range of momentum transfer squared. This eminent discrepancy casts some doubts on the applicability of the NRQCD approach to hard exclusive reactions involving charmonium.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
关键词[WOS]	B-C-MESON ; E(+)E(-) ANNIHILATION ; MATHEMATICA PACKAGE ; LEPTONIC DECAYS ; ROOT-S=10.6 GEV ; QUARK ; COEFFICIENTS ; AMPLITUDES ; INTEGRALS
收录类别	SCI
语种	英语
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/20783]
专题	理论物理研究所_理论物理所1978-2010年知识产出
推荐引用方式 GB/T 7714	Feng, F,Jia, Y,Sang, WL. Can Nonrelativistic QCD Explain the gamma gamma* -> eta(c) Transition Form Factor Data?[J]. PHYSICAL REVIEW LETTERS,2015,115(22):222001.
APA	Feng, F,Jia, Y,&Sang, WL.(2015).Can Nonrelativistic QCD Explain the gamma gamma* -> eta(c) Transition Form Factor Data?.PHYSICAL REVIEW LETTERS,115(22),222001.
MLA	Feng, F,et al."Can Nonrelativistic QCD Explain the gamma gamma* -> eta(c) Transition Form Factor Data?".PHYSICAL REVIEW LETTERS 115.22(2015):222001.