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Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia
Jia Y(贾宇); Jia, Y; Sang, WL
2009
发表期刊JOURNAL OF HIGH ENERGY PHYSICS
期号10页码:90
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
文章类型Article
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.
关键词Asymptotic Freedom Heavy Quark Physics Electromagnetic Processes and Properties QCD
学科领域Physics
研究领域[WOS]Physics ; Physics
DOI10.1088/1126-6708/2009/10/090
URL查看原文
语种英语
研究领域[WOS]Physics ; Physics
WOS类目Physics, Particles & Fields
WOS记录号WOS:000271542800090
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被引频次:1[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/311005/240387
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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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.
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