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题名: Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia
作者: Jia, Yu ;  Sang, Wen-Long
刊名: JOURNAL OF HIGH ENERGY PHYSICS
出版日期: 2009
期号: 10, 页码:-
关键词: HEAVY QUARKONIUM ;  RARE DECAY ;  MESON ;  ANNIHILATION ;  MODES
学科分类: Physics
通讯作者: Jia, Y , Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
部门归属: [Jia, Y] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China; [Jia, Y] Chinese Acad Sci, Theoret Phys Ctr Sci Facil, Beijing 100049, Peoples R China; [Sang, WL] 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.
资助者: National Natural Science Foundation of China[10875130, 10875156]
收录类别: SCI
原文出处: 查看原文
WOS记录号: WOS:000271542800090
Citation statistics: 
内容类型: 期刊论文
URI标识: http://ir.itp.ac.cn/handle/311006/5238
Appears in Collections:理论物理所1978-2010年知识产出_期刊论文

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Jia, Yu,Sang, Wen-Long. Observation prospects of leptonic and Dalitz decays of pseudoscalar quarkonia[J]. JOURNAL OF HIGH ENERGY PHYSICS,2009(10):-.
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