Searches for D0 - Anti-D0 Mixing, Rare Charm And Tau Decays Page: 4 of 4
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In the typical analysis, the plane perpendicular to the thrust axis is used to divide each
event in two hemispheres containing a candidate SM tau decay (tag-side) and a LFV tau
decay (signal-side), respectively. Background events are suppressed with requirements on
the missing mass, momentum or energy of the event, due to the neutrino(s) in the SM tau
decay. Signal events are selected by requiring that the candidate decay products total evergy
is compatible with the tau energy in the center-of-mass (C.M.) system (half the total C.M.
energy) and that their invariant mass is compatible with the tau mass within the experimental
resolution.
Using data corresponding to an integrated luminosity of 232 fbI BABAR measures
the UL on branching fraction, 1(r -- p y) < 6.8 x 10-8 [13] and 1(r -- e y) <
1.1 x 10-7 [14] at the 90% C.L. Using the results from r -- p y one can constrain the
parameter space in tan P - mA plane, where tan P is the ratio of vacuum expectation values
of the two Higgs doublets and the mA is the CP conserving Higgs boson mass, and the current
result excludes the higher tan region.
Belle searched for the lepton flavor violating decays '- -> l-KS (l = p, e) using 281
fb-I data and set the UL to be less than 4.9 x 10-8 and 5.6 x 10-8 at the 90% C.L, for
muon and electron modes, respectively [15]. For r -> lhh or r - lV modes [16], with
158 fb-I data, Belle set 90% C.L upper limits for the branching fractions in the range of
(1.6 - 8.0) x 10-7 at the 90% C.L. For r -> lhh decay, using 221 fb-I data, BABAR set
upper limits in the range of (0.7 - 4.8) x 10-7 at 90% C.L [17].
ACKNOWLEDGMENTS
This work is supported Department of Energy (US). I thank experts from BABAR and Belle
collaboration for the useful discussion and providing the results used in this review.
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Swain, Sanjay K. Searches for D0 - Anti-D0 Mixing, Rare Charm And Tau Decays, report, January 25, 2007; [Menlo Park, California]. (https://digital.library.unt.edu/ark:/67531/metadc882516/m1/4/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.