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Jia, Yu; Sang, Wen-Long; Jia, Y , Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia
Source PublicationJOURNAL OF HIGH ENERGY PHYSICS
KeywordHeavy Quarkonium Rare Decay Meson Annihilation Modes
AbstractTwo 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.
2009
ISSN1126-6708
Issue10Pages:-
Subject AreaPhysics
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China[10875130, 10875156] ; National Natural Science Foundation of China[10875130, 10875156] ; National Natural Science Foundation of China[10875130, 10875156] ; National Natural Science Foundation of China[10875130, 10875156]
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Cited Times:1[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/5238
Collection理论物理所科研产出_SCI论文
Corresponding AuthorJia, Y , Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Jia, Yu,Sang, Wen-Long,Jia, Y , Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China. Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia[J]. JOURNAL OF HIGH ENERGY PHYSICS,2009(10):-.
APA Jia, Yu,Sang, Wen-Long,&Jia, Y , Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China.(2009).Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia.JOURNAL OF HIGH ENERGY PHYSICS(10),-.
MLA Jia, Yu,et al."Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia".JOURNAL OF HIGH ENERGY PHYSICS .10(2009):-.
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