A Search for the Decays B^+ to e^+\nu_e and B^+ to \mu^+\nu_\mu Using Hadronic-tag Reconstruction
Conference
·
OSTI ID:892642
The authors report on a search for the rare decay modes B{sup +} {yields} e{sup +}{nu}{sub e} and B{sup +} {yields} {mu}{sup +}{nu}{sub {mu}} with data collected from the BABAR detector at the PEP-II e{sup +}e{sup -} storage ring. This search utilizes a new technique in which they fully reconstruct the accompanying B{sup -} in {Upsilon}(4S) {yields} B{sup +}B{sup -} events, and look for a mono-energetic lepton in B{sup +} rest frame. No signal candidates observed in either of the channels, consistent with the expected background, in a data sample of approximately 229 million B{bar B} pairs. The branching-fraction upper limits are set at {Beta}(B{sup +} {yields} e{sup +}{nu}{sub e}) < 7.9 x 10{sup -6} and {Beta}(B{sup +} {yields} {mu}{sup +}{nu}{sub {mu}}) < 6.2 x 10{sup -6} at the 90% confidence level.
- Research Organization:
- Stanford Linear Accelerator Center (SLAC)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-76SF00515;
- OSTI ID:
- 892642
- Report Number(s):
- SLAC-PUB-12026; hep-ex/0607110
- Conference Information:
- Contributed to 33rd International Conference on High Energy Physics (ICHEP 06), Moscow, Russia, 26 Jul - 2 Aug 2006
- Country of Publication:
- United States
- Language:
- English
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