Observation of the Semileptonic Decays B to D*taunu and Evidence for B to D Tau Nu PDF Download
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Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
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.
Author: Publisher: ISBN: Category : Languages : en Pages : 7
Book Description
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.
Author: Publisher: ISBN: Category : Languages : en Pages : 29
Book Description
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,
Author: Publisher: ISBN: Category : Languages : en Pages : 6
Book Description
Decays of B mesons to states involving [tau] leptons can be used as a tool to search for the effects of new physics, such as those involving a charged Higgs boson. The experimental status of the decays B → [tau][nu] and B → D{sup (*)}[tau][nu] is discussed, together with limits on new physics effects from current results. Leptonic and semileptonic decays of B mesons into states involving [tau] leptons remain experimentally challenging, but can prove a useful tool for constraining Standard Model parameters, and also offer to constrain the effects of any new physics that may exist including the presence of a charged Higgs boson.
Author: Publisher: ISBN: Category : Languages : en Pages : 4
Book Description
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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Author: Neus Penalva Martínez![Measurement of the Semileptonic Decays B-]D Tau Nu and B-]D* Tau Nu PDF](https://books.google.com/books/content/images/frontcover/wlnMwQEACAAJ?fife=w80-h100)
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Author: ![Semileptonic decays of B-mesons into τντ [tau ny tau] PDF](https://books.google.com/books/content/images/frontcover/gBLLzQEACAAJ?fife=w80-h100)
Author: Patrick Heiliger
Author: Patrick Heiliger![Semileptonic decays of B-mesons into _t63_n63_1tn_t63 [tau ny tau] PDF](https://books.google.com/books/content/images/frontcover/5ydNYAAACAAJ?fife=w80-h100)
Author: Patrick Heiliger![Semileptonic decays of B-mesons into tnt [tau ny tau] PDF](https://books.google.com/books/content/images/frontcover/rK4dHQAACAAJ?fife=w80-h100)
Author: Patrick Heiliger
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