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A Search For The Rare Leptonic B To Tau Anti Neutrino Recoiling Against B To Decays To Anti D0 L Lepton Neutrino
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Book Synopsis A Search for the Rare Leptonic B- to Tau- Anti-neutrino Recoiling Against B+ to Decays to Anti-D*0 L+ Lepton-neutrino by : Mousumi Datta
Download or read book A Search for the Rare Leptonic B- to Tau- Anti-neutrino Recoiling Against B+ to Decays to Anti-D*0 L+ Lepton-neutrino written by Mousumi Datta and published by . This book was released on 2006 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes a search for the decay B{sup -} {yields} {tau}{sup -}{bar {nu}}{sub {tau}} in 231.8 x 10{sup 6} {Upsilon}(4S) decays recorded with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed exclusive semi-leptonic B decay (B{sup +} {yields} {bar D}*{sup 0} {ell}{sup +}{nu}{sub {ell}}) is selected, and in the recoil a search for B{sup -} {yields} {tau}{sup -} {bar {nu}}{sub {tau}} signal is performed in the following {tau} decay modes: {tau}{sup -} {yields} e{sup -}{bar {nu}}{sub e}{nu}{sub {tau}}, {tau}{sup -} {yields} {mu}{sup -}{bar {nu}}{sub {mu}}{nu}{sub {tau}}, {tau}{sup -} {yields} {pi}{sup -}{nu}{sub {tau}}, {tau}{sup -} {yields} {pi}{sup -}{pi}{sup 0}{nu}{sub {tau}}, and {tau}{sup -} {yields} {pi}{sup -}{pi}{sup +}{pi}{sup -}{nu}{sub {tau}}. They find no evidence of signal, and they set a preliminary upper limit on the branching fraction of {beta}(B{sup -} {yields} {tau}{sup -}{bar {nu}}{sub {tau}})
Book Synopsis A Search for Positive B Mesons Decaying to Positive Tau Leptons-tau Neutrinos Recoiling Against Negative B Mesons Decaying to Neutral D Mesons-negative Leptons-antilepton Neutrinos-X Mesons by : Stephen Jacob Sekula
Download or read book A Search for Positive B Mesons Decaying to Positive Tau Leptons-tau Neutrinos Recoiling Against Negative B Mesons Decaying to Neutral D Mesons-negative Leptons-antilepton Neutrinos-X Mesons written by Stephen Jacob Sekula and published by . This book was released on 2004 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for B+ ---] Tau+ Neutrino(tau) Recoiling Against B- ---] D0 L- Anti-nu(l) X. by : Stephen Jacob Sekula
Download or read book A Search for B+ ---] Tau+ Neutrino(tau) Recoiling Against B- ---] D0 L- Anti-nu(l) X. written by Stephen Jacob Sekula and published by . This book was released on 2005 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The fundamental pursuit of physics has always been a deeper understanding of nature's workings. In the last fifty years this pursuit has culminated in a view of the universe as a complex tapestry woven from only a few fundamental particles and interactions. This description of the universe, the Standard Model of Particle Physics, has been highly successful at predicting the behavior of these particles and interactions. However, the model leaves many questions unanswered and the hope is that many precise tests of its predictions will yield inconsistencies, windows into new physical principles. The search for processes that are allowed by the Standard Model but inherently rare provides fruitful ground for such a test. The large sample of B mesons available from the PEP-II/BABAR B-factory furnishes an opportunity to test Standard Model predictions via rare B meson decay modes.
Book Synopsis A Search for the Rare Leptonic B Decay B to Tau Nu Recoiling Against B to Dstar-zero 1 Nu by : Mousumi Datta
Download or read book A Search for the Rare Leptonic B Decay B to Tau Nu Recoiling Against B to Dstar-zero 1 Nu written by Mousumi Datta and published by . This book was released on 2005 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book High Energy Physics Index written by and published by . This book was released on 1993 with total page 640 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Leptonic Decays of the Charged B Meson by : Luke Andrew Corwin
Download or read book Leptonic Decays of the Charged B Meson written by Luke Andrew Corwin and published by . This book was released on 2008 with total page 148 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Search for the Rare Leptonic Decay B- -] Tau- Nubar by :
Download or read book Search for the Rare Leptonic Decay B- -] Tau- Nubar written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: 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]])
Book Synopsis Rare Leptonic Decays of the D Meson and Tau Lepton by : Ilya Narsky
Download or read book Rare Leptonic Decays of the D Meson and Tau Lepton written by Ilya Narsky and published by . This book was released on 2001 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis B to Tau Leptonic and Semileptonic Decays by :
Download or read book B to Tau Leptonic and Semileptonic Decays written by and published by . This book was released on 2011 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Leptonic Decays of the Charged B Meson by :
Download or read book Leptonic Decays of the Charged B Meson written by and published by . This book was released on 2008 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the decay B+ 2!l+[nu] (= [tau], [mu], or e) in (458.9±5.1)×106 [Upsilon](4S) decays recorded with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed exclusive semi-leptonic B decay (B- 2!D0l -$\bar{v}$X) is selected, and in the recoil a search for B+ 2! +[nu]l signal is performed. The [tau] is identified in the following channels: [tau]+ 2!e+[nu]e$\bar{v}$[tau], [tau]+ 2![mu]+[nu][mu]$\bar{v}$[tau], [tau]+ 2![pi]+$\bar{v}$[tau], and [tau]+ 2![pi]+[pi]0$\bar{v}$[tau] . The analysis strategy and the statistical procedure is set up for branching fraction extraction or upper limit determination. We determine from the dataset a preliminary measurement of B(B+ 2![tau]+[nu][tau]) = (1.8 ± 0.8 ± 0.1) × 10-4, which excludes zero at 2.4[sigma], and fB = 255 ± 58 MeV. Combination with the hadronically tagged measurement yields B(B+ 2![tau]+[nu][tau]) = (1.8 ± 0.6) × 10-4. We also set preliminary limits on the branching fractions at B(B+ 2!e+[nu]e)
Book Synopsis Searches for Leptonic B-Decays and B to D(*) Tau Nu/Tau at the B-Factories by :
Download or read book Searches for Leptonic B-Decays and B to D(*) Tau Nu/Tau at the B-Factories written by and published by . This book was released on 2013 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for the Rare Decay of a Charged B Meson Into a Charged K Meson, a Neutrino and an Anti-neutrino / by : Joachim Harnois-Déraps
Download or read book A Search for the Rare Decay of a Charged B Meson Into a Charged K Meson, a Neutrino and an Anti-neutrino / written by Joachim Harnois-Déraps and published by . This book was released on 2006 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: "The document describes a search for the rare decay B[bar] [right arrow] K[bar]vv̄ in a data set of about 230 millions of BB[bar] pairs recorded by the BABAR detector at the PEP-II B Factory, via the process e+e- [right arrow] [Upsilon](4S) [right arrow] BB[bar]. The method used selects events in which the B+ meson is fully reconstructed, and looks for a K[bar] in the rest of the event. This is accomplished by applying kinematical and topological restrictions that select B[bar] [right arrow] K[bar]vv̄ events with the largest possible efficiency, while rejecting a maximum amount of background events. The number of background events is estimated from data and from simulated events, while the value of the selection efficiency relies solely on the simulation of B[bar] [right arrow] K[bar]vv̄ decays in the BABAR detector. These two numbers are required in order to set an upper limit on the branching ratio. We analyze a subset of the data sample and provide an interpretation of the result." --
Book Synopsis Search for B Minus Going to Rho Lepton Anti-neutrino at ARGUS by : Patrick Richard Behrendt Saull
Download or read book Search for B Minus Going to Rho Lepton Anti-neutrino at ARGUS written by Patrick Richard Behrendt Saull and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Data taken with the ARGUS detector at DESY, Hamburg, specifically BB pairs produced from $e sp+e sp-$ collisions at the energy of the $ Upsilon$(4S) resonance, are used to investigate the decay channel $B sp- to rho sp0 ell sp- bar nu.$ Observation of a signal would be conclusive evidence that the CKM matrix element $V sb{ub}$ is non-zero, a necessary condition for the validity of the Kobayashi-Maskawa explanation for CP violation. The recoil mass technique is employed to try to isolate signal events. Monte Carlo data are used to model the signal background, which is dominated by reasonably well understood $b to c$ decays. Using the model of Wirbel, Stech, and Bauer, a model-dependent upper limit of 1.6 $ times$ 10$ sp{-2}$ is placed on the value of $ vert V sb{ub} vert$ at 90% confidence. The results, however, suggest that further study of the $b to c$ background is warranted. In particular, B meson transitions to states with higher mass than the $D sp*$ may contribute significantly." --
Download or read book Physics Briefs written by and published by . This book was released on 1990 with total page 1266 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis First Observation of Lepton Tau Decays to Neutrino, K and Eta by : Guoheng Wei
Download or read book First Observation of Lepton Tau Decays to Neutrino, K and Eta written by Guoheng Wei and published by . This book was released on 1995 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Tau Decays Into Three Charged Leptons and Two Neutrinos by :
Download or read book Tau Decays Into Three Charged Leptons and Two Neutrinos written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have searched for the radiative leptonic tau decays[tau][yields] ee[sup+]e[sup -][nu][sub[tau]][nu][sub e] and[tau][yields][mu]e[sup+]e[sup -][nu][sub[tau]][nu][sub[mu]] using 3.60 fb[sup -1] of data collected by the CLEO-II experiment at CESR. We present a first observation of the[tau][yields] ee[sup+]e[sup -][nu][sub[tau]][nu][sub e] process. For this channel we measure the branching fraction B([tau][yields] ee[sup+]e[sup -][nu][sub[tau]][nu][sub e])= (2.8[+-] 1.4[+-] 0.4) x 10[sup -5]. An upper limit is established for the second channel: B([tau][yields][mu]e[sup+][nu][sub[tau]][nu][sub[mu]])
Book Synopsis A Search for the Decay B+ to Tau+ Nu_tau by :
Download or read book A Search for the Decay B+ to Tau+ Nu_tau written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We search for the rare leptonic decay B →?+?{sub?} in a sample of 232 x 106 B{bar B} pairs collected with the BABAR detector at the SLAC PEP-II B-Factory. Signal events are selected by examining the properties of the B meson recoiling against the semileptonic decay B− → D*°l{bar?}{sub {ell}}. We find no evidence for a signal and set an upper limit on the branching fraction of?(B+ →?+?{sub?})
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