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Sang, WL; Feng, F2; Jia, Y5,6; Liang, SR
Next-to-next-to-leading-order QCD corrections to chi(c0,2) -> gamma gamma
Source PublicationPHYSICAL REVIEW D
Language英语
KeywordRELATIVISTIC QUARK-MODEL B-C-MESON ELECTROMAGNETIC ANNIHILATION MATHEMATICA PACKAGE 2-PHOTON DECAYS LEPTONIC DECAYS HEAVY QUARKONIA RATES AMPLITUDES CHARMONIUM
AbstractWe 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.
2016
Volume94Issue:11Pages:111501
Subject AreaAstronomy & Astrophysics ; Physics
DOIhttp://dx.doi.org/10.1103/PhysRevD.94.111501
Indexed BySCI
Funding OrganizationNational 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
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/23233
Collection理论物理所科研产出_SCI论文
Affiliation1.Southwest Univ, Sch 1 Phys Sci & Technol, Chongqing 400700, Peoples R China
2.Chinese Acad Sci, Inst Theoret Phys, State Key Lab Theoret Phys, Beijing 100190, Peoples R China
3.China Univ Min & Technol, Beijing 100083, Peoples R China
4.Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
5.Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China
6.Univ Chinese Acad Sci, Sch Phys, Beijing 100049, Peoples R China
7.Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China
Recommended Citation
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.
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