Soft Pion Emission in Semileptonic B-meson Decays PDF Download
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Author: Jose L. Goity
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Jose L. Goity
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :
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An analysis of semileptonic decays of B mesons with the emission of a single soft pion is presented in the framework of the heavy-quark limit using an effective Lagrangian which implements chiral and heavy-quark symmetries. The analysis is performed at leading order of the chiral and inverse heavy mass expansions. In addition to the ground state heavy mesons some of their resonances are included. The estimates of the various coupling constants and form factors needed in the analysis are obtained using a chiral quark model. As the main result, a clear indication is found that the 0 and 1+ resonances substantially affect the decay mode with a D{sup *} in the final state, and a less dramatic effect is also noticed in the D mode. An analysis of the decay spectrum in the D{sup *}-?2 invariant mass is carried out, showing the main effects of including the resonances. The obtained rates show promising prospects for studies of soft pion emission in semileptonic B-meson decays in a B-meson factory where, module experimental cuts, about 105 such decays in the D meson mode and 104 in the D{sup *} mode could be observed per year.
Author: Mauricio Garcia-Sciveres
Publisher:
ISBN:
Category :
Languages : en
Pages : 338
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Author: Suzanne Lorraine Jones
Publisher:
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Category :
Languages : en
Pages : 216
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Author:
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Category :
Languages : en
Pages : 58
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Author: Leo Bellantoni
Publisher:
ISBN:
Category :
Languages : en
Pages : 280
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Author: Kenneth Arthur Bloom
Publisher:
ISBN:
Category :
Languages : en
Pages : 584
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Author: Anders Ryd
Publisher: American Institute of Physics
ISBN:
Category : Science
Languages : en
Pages : 508
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The conference covered both the experimental and theoretical progress in the field of heavy quark physics and is of interest to readers who wish to stay current with the forefront of research in this field.
Author: Luke Andrew Corwin
Publisher:
ISBN:
Category : B mesons
Languages : en
Pages : 148
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Abstract: 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.
Author: Mark Owen Battle
Publisher:
ISBN:
Category :
Languages : en
Pages : 408
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