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Next-to-next-to-leading-order QCD corrections to chi(c0,2) -> gamma gamma
Sang, WL; Feng, F; Jia Y(贾宇); Liang SR(梁爽然); Jia, Y; Liang, SR
2016
发表期刊PHYSICAL REVIEW D
卷号94期号:11
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.
文章类型Article
DOI10.1103/PhysRevD.94.111501
关键词[WOS]RELATIVISTIC QUARK-MODEL ; B-C-MESON ; ELECTROMAGNETIC ANNIHILATION ; MATHEMATICA PACKAGE ; 2-PHOTON DECAYS ; LEPTONIC DECAYS ; HEAVY QUARKONIA ; RATES ; AMPLITUDES ; CHARMONIUM
语种英语
WOS记录号WOS:000391016800001
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被引频次:2[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/260628
专题理论物理室
作者单位中国科学院高能物理研究所
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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).
APA Sang, WL,Feng, F,贾宇,梁爽然,Jia, Y,&Liang, SR.(2016).Next-to-next-to-leading-order QCD corrections to chi(c0,2) -> gamma gamma.PHYSICAL REVIEW D,94(11).
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).
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