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Rare and forbidden decay of charm mesons at CLEO-c and BES-III
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Rare and forbidden decay of charm mesons at
CLEO-c and BES-III
Hai-Bo Li
??
Author Institute of High Energy Physics, P.O.Box 918, Beijing 100049, China
E-mail: lihb@
This paper presents the results of searches for the flavor-changing neutral current, lepton-number-
violating and lepton-flavor-violating processes in the charm mesons decays. Recent results
from charged D mesons decays to final states with dielectrons from CLEO-c are reported. The
prospects of the searches for the rare charm decays at BES-III are also discussed.
KAON International Conference
May 21-25 2007
Laboratori Nazionali di Frascati dell’INFN, Rome, Italy
?
Speaker.
?
For BES-III and CLEO-c Collaborations.
c? Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence. http://pos.sissa.it/
Rare and forbidden decay of charm mesons at CLEO-c and BES-III Hai-Bo Li
1. Introduction
Searches for rare-decay processes have played an important role in the development of the
Standard Model (SM). The absence of flavor-changing neutral current (FCNC) in K decays im-
plied the existence of charm quark, and the observations of B
0 ?B0 and Bs ?Bs mixings (FCNC
processes) signaled the very large top-quark mass. The study of the FCNC has been focused on
rare decays involving transitions such as s → dl+ l?, s → dν ν, b → sγ , and b → l+ l?.
In contrast with the K and B FCNC processes, the D meson FCNC transitions are mediated
by light down-quark sector, which implies an efficient Glashow-Iliopoulos-Maiani (IM) cancella-
tion. In this case, D
0
mixing, as well as FCNC decays are expected to be very small in the SM
short-distance contributions. Many extensions of the SM may enhance the mixing rate and FCNC
processes in the short-distance of the D system by orders of magnitudes. Unfortunately, the new
physics contributions are diluted by large long-distance contributions which are likel
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