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Leptonic Decays of the Charged B Meson
| Title: | Leptonic Decays of the Charged B Meson |
| Author: | Corwin, Luke Andrew |
| Description: | We present a search for the decay of the charged B meson into a charged lepton and a neutrino 458.9 million Upsilon(4S) decays recorded with the Babar detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed exclusive semileptonic B decay is selected, and in the recoil a search for the signal decay is performed. The tau lepton is identified in decays to an electron and two neutrinos; a muon and two neutrinos; a charged pion and a neutrino; or a charged pion, a neutral pion, and a neutrino. The analysis strategy and the statistical procedure is set up for branching fraction extraction or upper limit determination. We determine from the data set a preliminary measurement of the branching fraction a charged B decaying to a tau lepton and a neutrino = (1.8 ± 0.8 ± 0.1)E-4, which excludes zero at 2.4 standard deviations. We extract the B meson decay constant = 255 ± 58 MeV. Combination with the hadronically tagged measurement yields (1.8 ± 0.6)E-4. We also set preliminary limits on the branching fraction of charged B decaying to an electron and a neutrino at 7.7E-6 and the charged B decaying to a muon and a neutrino at 11E-6. The limits are at the 90% confidence level. |
| Permanent Link: |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1228320450
http://hdl.handle.net/2374.OX/106491 |
| Date: | 2008 |
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