Measurement Of The Semileptonic Anti B To D Tau Anti Nu Tau Decays At Babar PDF Download
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Total Pages | : 4 |
Release | : 2011 |
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Download Measurement of the Semileptonic Anti-B to D(*) Tau Anti-Nu/Tau Decays at BaBar Book in PDF, ePub and Kindle
Semileptonic B meson decays into final states containing the [tau] lepton are of interesting as they provide information on the Standard Model as well as a window on new physics effects. We present results on {bar B} → D{sup (*)} [tau]{bar {nu}}{sub {tau}} decays where the second B in the event is fully reconstructed.
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Total Pages | : 29 |
Release | : 2009 |
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Download Measurement of the Semileptonic Decays B-]D Tau Nu and B-]D* Tau Nu Book in PDF, ePub and Kindle
The authors present measurements of the semileptonic decays B− → D°?− {bar?}{sub?}, B− → D*°?−{bar {nu}}{sub?}, {bar B}° → D?− {bar {nu}}{sub?}, and {bar B}° → D*+?−{bar {nu}}{sub?}, which are sensitive to non-Standard Model amplitudes in certain scenarios. The data sample consists of 232 x 106?(4S) → B{bar B} decays collected with the BABAR detector at the PEP-II e+e− collider. They select events with a D or D* meson and a light lepton (l = e or?) recoiling against a fully reconstructed B meson. They perform a fit to the joint distribution of lepton momentum and missing mass squared to distinguish signal B → D{sup (*)}?− {bar {nu}}{sub?} ({tau}− → l− {bar {nu}}{sub l}{nu}{sub {tau}}) events from the backgrounds, predominantly B → D{sup (*)} l−{bar {nu}}{sub l}. They measure the branching-fraction ratios R(D) {triple_bond}?(B → D{tau}− {bar {nu}}{sub {tau}})/?(B → Dl− {bar {nu}}{sub {ell}}) and R(D*) {triple_bond}?(B → D*{tau}− {bar {nu}}{sub {tau}})/?(B → D* {ell}− {bar {nu}}{sub {ell}}) and, from a combined fit to B− and {bar B}° channels, obtain the results R(D) = (41.6 ± 11.7 ± 5.2)% and R(D*) = (29.7 ± 5.6 ± 1.8)%, where the uncertainties are statistical and systematic. Normalizing to measured B− → D{sup (*)0} {ell}− {bar {nu}}{sub {ell}} branching fractions, they obtain?(B → D{tau}− {bar {nu}}{sub {tau}}) = (0.86 ± 0.24 ± 0.11 ± 0.06)% and?(B → D*{tau}− {bar {nu}}{sub {tau}}) = (1.62 ± 0.31 ± 0.10 ± 0.05)%, where the additional third uncertainty is from the normalization mode. They also present, for the first time, distributions of the lepton momentum,
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Total Pages | : 7 |
Release | : 2007 |
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Download Observation of the Semileptonic Decays B to D*taunu and Evidence for B to D Tau Nu Book in PDF, ePub and Kindle
We present measurements of the semileptonic decays B− → D°?−{bar {nu}}{sub?}, B− → D{sup *0}?−{bar {nu}}{sub?}, B− → D?−{bar {nu}}{sub {tau}}, and B− → D{sup *+}{tau}−{bar {nu}}{sub {tau}}, which are potentially sensitive to non-Standard Model amplitudes, The data sample comprises 232 x 106?(4s) → B{bar B} decays collected with the BABAR detector. From a combined fit to B− and {bar B}° channels, we obtain the branching fractions?(B → D{sub {tau}}−{bar {nu}}{sub {tau}}) = (0:86 ± 0:24 ± 0:11 ± 0:06)% and?(B → D*{tau}−{bar {nu}}{sub {tau}}) = (1:62 ± 0:31 ± 0:10 ± 0:05)% (normalized for the {bar B}°), where the uncertainties are statistical, systematic, and normalization-mode-related.
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Total Pages | : 4 |
Release | : 2015 |
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Download Measurement of Radiative Tau Decays Tau -] L Gamma Nu Anti-nu at BaBar Book in PDF, ePub and Kindle
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Total Pages | : 14 |
Release | : 2005 |
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Download A Study of Semileptonic B Decays And of Lepton Flavor Violating Tau Decays at BaBar Book in PDF, ePub and Kindle
The study of the semileptonic B decays at BABAR is presented. The results shown include measurements of the moments of hadronic-mass and electron-energy of the decay B → X{sub c}l[nu]; a determination of the.
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Release | : 2006 |
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Download Measurement of B -] D Form Factors in the Semileptonic Decay B -] D* L Nu at BaBar Book in PDF, ePub and Kindle
Abstract Not Provided.
Author | : Patrick Heiliger |
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Total Pages | : 16 |
Release | : 1989 |
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Download Semileptonic decays of B-mesons into tau ny tau Book in PDF, ePub and Kindle
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Release | : 2004 |
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Download Search for the Rare Leptonic Decay B- -] Tau- Nubar Book in PDF, ePub and Kindle
We present a search for the decay B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]] in a sample of 88.9 x 10[sup 6] B[bar B]pairs recorded with the BABAR detector at the SLAC B-Factory. One of the two B mesons from the [Upsilon](4S) is reconstructed in a hadronic or a semileptonic final state and the decay products of the other B in the event are analyzed for consistency with a B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]] decay. We find no evidence of a signal and set an upper limit on the branching fraction of [Beta](B[sup -] [yields] [tau][sup -] [bar [nu]][sub [tau]])
Author | : Mandeep Singh Gill |
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Total Pages | : 690 |
Release | : 2004 |
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Download Measurement of B-->D Form Factors in the Semileptonic Decay B0-->D*lv at BaBar Book in PDF, ePub and Kindle
Author | : Michael A. Mazur |
Publisher | : ProQuest |
Total Pages | : 674 |
Release | : 2007 |
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ISBN | : 9780549268611 |
Download Study of Exclusive Semileptonic B Meson Decays to Tau Leptons Book in PDF, ePub and Kindle
We present the results of a search for four exclusive semileptonic decays B & rarr; D(*)tau -nutau in 209 fb -1 of data collected with the BABAR detector, corresponding to 232 million e+e - & rarr; Upsilon(4S) & rarr; B B events. We select events with a D (*) meson and a light lepton (e or mu) recoiling against a fully-reconstructed B meson. We perform a fit to the lepton spectrum and missing mass squared to discriminate signal events from backgrounds, predominantly B & rarr; D (*) & ell;-nu & ell; . A control sample of identified D** & ell;- nu & ell; events is included in the fit to estimate the background contribution from these decays. We measure B (B & rarr; Dtaunu) = (0.86+/-0.24+/-0.11+/-0.06)% and B (B & rarr; D*taunu) = (1.62+/-0.31+/-0.10+/-0.05)%, where the errors are statistical, systematic, and normalization-mode related, respectively, and where the results are expressed for the B0 lifetime.