Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia
文献类型：期刊论文
| 作者 | Jia Y(贾宇) ; Jia, Y; Sang, WL
|
| 刊名 | JOURNAL OF HIGH ENERGY PHYSICS
 |
| 出版日期 | 2009 |
| 期号 | 10页码:90 |
| 关键词 | Asymptotic Freedom Heavy Quark Physics Electromagnetic Processes and Properties QCD |
| 通讯作者 | [Jia, Yu] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; [Jia, Yu] Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China ; [Sang, Wen-Long] Chinese Acad Sci, Key Lab Frontiers Theoret Phys, Inst Theoret Phys, Beijing 100190, Peoples R China |
| 英文摘要 | Two types of pseudoscalar quarkonium electromagnetic decay processes, i.e. decay to a lepton pair, and to a lepton pair plus a photon (Dalitz decay), are analyzed at the leading order in NRQCD expansion. The former type of processes, highly suppressed in the Standard Model, have been hoped to act as the sensitive probes of the possible new physics. The latter type of processes generally possess much greater decay rates than the former, owing to several conspiring factors. The recently launched BES-III program, with 10(8) eta(c) samples to be anticipated in the coming years, may be able to observe the Dalitz decays eta(c) -> e(+)e(-)gamma and eta(c) -> mu(+)mu(-gamma), which have branching ratios of order 10(-6). When the radiated photon becomes very soft, the Dalitz decay events will be experimentally tagged as the exclusive lepton pair events. It is found that, those quasi-two-body events that arise from eta(c) -> e(+)e(-)gamma with photon energy less than the minimum sensitivity of the electromagnetic calorimeter, can vastly outnumber the literal eta(c) -> e(+)e(-) events, how ever this amplification is still not dramatic enough for the BES-III experiment to establish these events. Consequently, the expectation of looking for new physics signature in the eta(c) -> l(+)l(-) channel is obscured, unless the contamination from eta(c) -> l(+)l(-)gamma has been taken into account carefully. |
| 学科主题 | Physics |
| 类目[WOS] | Physics, Particles & Fields |
| 研究领域[WOS] | Physics |
| 原文出处 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000271542800090 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/240387]  |
| 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 | Jia Y,Jia, Y,Sang, WL. Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia[J]. JOURNAL OF HIGH ENERGY PHYSICS,2009(10):90. |
| APA | 贾宇,Jia, Y,&Sang, WL.(2009).Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia.JOURNAL OF HIGH ENERGY PHYSICS(10),90. |
| MLA | 贾宇,et al."Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia".JOURNAL OF HIGH ENERGY PHYSICS .10(2009):90. |
入库方式： OAI收割
来源：高能物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。