Semileptonic decays of B-mesons into tnt [tau ny tau]
Author | : Patrick Heiliger |
Publisher | : |
Total Pages | : 14 |
Release | : 1989 |
Genre | : |
ISBN | : |
Download Semileptonic decays of B-mesons into tnt [tau ny tau] Book in PDF, ePub and Kindle
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download Semileptonic Decays Of B Mesons Into Tnt Tau Ny Tau PDF full book. Access full book title Semileptonic Decays Of B Mesons Into Tnt Tau Ny Tau.
Author | : Patrick Heiliger |
Publisher | : |
Total Pages | : 14 |
Release | : 1989 |
Genre | : |
ISBN | : |
Author | : Patrick Heiliger |
Publisher | : |
Total Pages | : 16 |
Release | : 1989 |
Genre | : |
ISBN | : |
Author | : Patrick Heiliger |
Publisher | : |
Total Pages | : 14 |
Release | : 1989 |
Genre | : |
ISBN | : |
Author | : Patrick Heiliger |
Publisher | : |
Total Pages | : 14 |
Release | : 1989 |
Genre | : |
ISBN | : |
Author | : |
Publisher | : |
Total Pages | : 6 |
Release | : 2011 |
Genre | : |
ISBN | : |
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 | : Michael A. Mazur |
Publisher | : ProQuest |
Total Pages | : 674 |
Release | : 2007 |
Genre | : |
ISBN | : 9780549268611 |
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.
Author | : |
Publisher | : |
Total Pages | : 359 |
Release | : 2007 |
Genre | : |
ISBN | : |
We present the results of a search for four exclusive semileptonic decays B → D{sup (*)}[tau]−{bar [nu]}{sub [tau]} in 209 fb−1 of data collected with the BABAR detector, corresponding to 232 million e+e- → [Upsilon](4S) → B{bar B} events. We select events with a D{sup (*)} 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 → D{sup (*)}{tau}−{bar [nu]}{sub {tau}}. A control sample of identified D**l−{bar {nu}}{sub {ell}} events is included in the fit to estimate the background contribution from these decays. We measure [beta](B → D{sub {tau}{nu}}) = (0.86±0.24±0.11±0.06)% and [beta](B → D*{sub {tau}{nu}}) = (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 {bar B}° lifetime.
Author | : |
Publisher | : |
Total Pages | : 29 |
Release | : 2009 |
Genre | : |
ISBN | : |
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 | : |
Total Pages | : 4 |
Release | : 2011 |
Genre | : |
ISBN | : |
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.
Author | : Jan Hasenbusch |
Publisher | : |
Total Pages | : |
Release | : 2018 |
Genre | : Bosons |
ISBN | : |