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题名: Next-to-next-to-leading-order QCD corrections to chi(c0,2) -> gamma gamma
作者: Sang, WL ;  Feng, F ;  Jia, Y ;  Liang, SR
刊名: PHYSICAL REVIEW D
出版日期: 2016
卷号: 94, 期号:11, 页码:111501
学科分类: Astronomy & Astrophysics; Physics
DOI: http://dx.doi.org/10.1103/PhysRevD.94.111501
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.
文章类型: Article
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.
类目[WOS]: Astronomy & Astrophysics ;  Physics, Particles & Fields
关键词[WOS]: RELATIVISTIC QUARK-MODEL ;  B-C-MESON ;  ELECTROMAGNETIC ANNIHILATION ;  MATHEMATICA PACKAGE ;  2-PHOTON DECAYS ;  LEPTONIC DECAYS ;  HEAVY QUARKONIA ;  RATES ;  AMPLITUDES ;  CHARMONIUM
收录类别: SCI
项目资助者: 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
语种: 英语
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/21454
Appears in Collections:理论物理所2016年知识产出_期刊论文

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Recommended Citation:
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.
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