Search for the Lepton Number Violating Decay (tau)(yields)(mu)(gamma).

[摘要] Using data collected with the BABAR detector between 1999 and 2001, we describe a preliminary search for the neutrinoless decay gamma yields micro gamma. This data sample includes data collected both on and of the Gamma(4S) resonance and corresponds to 56 x 10 the the sixth power produced tau pair events. The search has an efficiency of 5.2 plus or minus 0:1(MCstat) plus or minus 0:5(sys)% and an expected background rate of 7.8 plus or minus 1.4 events. We select 13 events in the final sample. As there is no evidence for a signal in this data, we set a preliminary upper limit of B(gamma yields micro gamma) less than 2:0 X10 to the minus 6th power at 90% CL.

[发布机构] Technical Information Center Oak Ridge Tennessee

[学科分类] 工程和技术（综合）

[关键词] BABAR detectors;Neutrinoless decay;Mass determination;Energy determination;Systematics