A Search for B{sup +} --> {tau}{sup +}{nu}{sub {tau}} Recoiling Against B{sup -} --> D*{sup 0}{ell}{sup -}{bar {nu}}{sub {ell}}
The authors present a search for the decay B{sup +} --> {tau}{sup +}{nu}{sub {tau}} in 124.1 x 10{sup 6} {Upsilon}(4S) decays recorded with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed exclusive semi-leptonic B decay (B{sup -} --> D*{sup 0}{ell}{sup -}{bar {nu}}{sub {ell}}) is selected, and in the recoil a search for B{sup +} --> {tau}{sup +}{nu}{sub {tau}} signal is performed. The {tau} is identified in the following channels: {tau}{sup +} --> e{sup +}{nu}{sub e}{bar {nu}}{sub {tau}} --> {mu}{sup +}{nu}{sub {mu}}{bar {nu}}{sub {tau}}, {tau}{sup +} --> {pi}{sup +}{bar {nu}}{sub {tau}}, {tau}{sup +} --> {pi}{sup +}{pi}{sup 0}{bar {nu}}{sub {tau}}, {tau}{sup +} --> {pi}{sup +}{pi}{sup -}{pi}{sup +}{bar {nu}}{sub {tau}}. The authors find no evidence of signal, and they set a preliminary upper limit on the branching fraction of B(B{sup +} --> {tau}{sup +}{nu}{sub {tau}}) < 4.3 x 10{sup -4} at the 90% confidence level (CL). This result is then combined with a statistically independent BABAR search for B{sup +} --> {tau}{sup +}{nu}{sub {tau}} to give a combined preliminary limit of B(B{sup +} --> {tau}{sup +}{nu}{sub {tau}}) < 3.3 x 10{sup -4} at 90% CL.
- Research Organization:
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (US)
- DOE Contract Number:
- AC03-76SF00515
- OSTI ID:
- 829752
- Report Number(s):
- SLAC-PUB-10611; TRN: US0405761
- Resource Relation:
- Other Information: PBD: 18 Aug 2004
- Country of Publication:
- United States
- Language:
- English
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