Next-to-next-to-leading-order QCD corrections to chi(c0,2) -> gamma gamma
文献类型：期刊论文
| 作者 | Sang, WL; Feng, F; Jia Y(贾宇) ; Liang SR(梁爽然); Jia, Y; Liang, SR
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| 刊名 | PHYSICAL REVIEW D
 |
| 出版日期 | 2016 |
| 卷号 | 94期号:11 |
| DOI | 10.1103/PhysRevD.94.111501 |
| 文献子类 | 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. |
| WOS关键词 | 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 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/260628]  |
| 专题 | 高能物理研究所_理论物理室 |
| 作者单位 | 中国科学院高能物理研究所 |
| 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). |
| 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). |
入库方式： OAI收割
来源：高能物理研究所
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