Next-to-next-to-leading-order QCD corrections to chi(c0,2) -> gamma gamma

doi:http://dx.doi.org/10.1103/PhysRevD.94.111501

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	Next-to-next-to-leading-order QCD corrections to chi(c0,2) -> gamma gamma
	Sang, WL ; Feng, F 7; Jia, Y 3,5; Liang, SR
刊名	PHYSICAL REVIEW D
	2016
卷号	94 期号:11 页码:111501
关键词	RELATIVISTIC QUARK-MODEL B-C-MESON ELECTROMAGNETIC ANNIHILATION MATHEMATICA PACKAGE 2-PHOTON DECAYS LEPTONIC DECAYS HEAVY QUARKONIA RATES AMPLITUDES CHARMONIUM
DOI	http://dx.doi.org/10.1103/PhysRevD.94.111501
英文摘要	We calculate the next-to-next-to-leading-order perturbative corrections to P-wave quarkonia annihilation decay to two photons, in the framework of nonrelativistic QCD factorization. The order-alpha(2)(s) short-distance coefficients associated with each helicity amplitude are presented in a semianalytic form, including the "light-by-light" contributions. With sizable next-to-next-to-leading-order corrections, we find a disquieting discrepancy when confronting our state-of-the-art predictions with the latest BESIII measurements, which especially fail to account for the measured chi(c2) -> gamma gamma width. Incorporating the effects of spin-dependent forces would even exacerbate the situation, since it lifts the degeneracy between the nonperturbative nonrelativistic QCD matrix elements of chi(c0) and chi(c2) toward the wrong direction. We also present the order-alpha(2)(s) predictions to chi(b2) -> gamma gamma, which await the future experimental test.
学科主题	Astronomy & Astrophysics ; Physics
语种	英语
资助机构	National Natural Science Foundation of China [11447031, 11605144, 11505285] ; Natural Science Foundation of ChongQing [cstc2014jcyjA00029] ; Fundamental Research Funds for the Central Universities [XDJK2016C067] ; National Natural Science Foundation of China (CRC110 by DFG) [11475188, 11261130311, 11621131001] ; National Natural Science Foundation of China (NSFC) [11475188, 11261130311, 11621131001] ; IHEP Innovation Grant [Y4545170Y2] ; State Key Lab for Electronics and Particle Detectors
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/23233]
专题	理论物理研究所_理论物理所1978-2010年知识产出
作者单位	1.China Univ Min & Technol, Beijing 100083, Peoples R China 2.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China 3.Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China 4.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China 5.Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China 6.Southwest Univ, Sch 1 Phys Sci & Technol, Chongqing 400700, Peoples R China 7.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
推荐引用方式 GB/T 7714	Sang, WL,Feng, F,Jia, Y,et al. Next-to-next-to-leading-order QCD corrections to chi(c0,2) -> gamma gamma[J]. PHYSICAL REVIEW D,2016,94(11):111501.
APA	Sang, WL,Feng, F,Jia, Y,&Liang, SR.(2016).Next-to-next-to-leading-order QCD corrections to chi(c0,2) -> gamma gamma.PHYSICAL REVIEW D,94(11),111501.
MLA	Sang, WL,et al."Next-to-next-to-leading-order QCD corrections to chi(c0,2) -> gamma gamma".PHYSICAL REVIEW D 94.11(2016):111501.