中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
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

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