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; Jia, Y; Liang, SR; Sang, WL (reprint author), Southwest Univ, Sch 1 Phys Sci & Technol, Chongqing 400700, Peoples R China.; Sang, WL (reprint author), Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China.
刊名	PHYSICAL REVIEW D
	2016
卷号	94 期号:11 页码:111501
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
内容类型	期刊论文
源URL	[http://ir.itp.ac.cn/handle/311006/21454]
专题	理论物理研究所_理论物理所1978-2010年知识产出
通讯作者	Sang, WL (reprint author), Southwest Univ, Sch 1 Phys Sci & Technol, Chongqing 400700, Peoples R China.; Sang, WL (reprint author), 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,Sang, WL ,&Sang, WL .(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.