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A Search For The Decay B Tau Nu Tau At Babar
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Book Synopsis A Search for the Decay B+ ---] Tau+ Nu/Tau at BaBar by : M. Datta
Download or read book A Search for the Decay B+ ---] Tau+ Nu/Tau at BaBar written by M. Datta and published by . This book was released on 2005 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on an 87-fb{sup -1} dataset collected by the Babar detector at the PEP-II asymmetric-energy B-Factory, a search for D{sup 0}-{bar D}{sup 0} mixing has been made using the semileptonic decay modes D*{sup +} {yields} {pi}{sup +}D{sup 0}, D{sup 0} {yields} Ke{nu} (+c.c.). The use of these modes allows unambiguous flavor tagging and a combined fit of the D{sup 0} decay time and D*{sup +}-D{sup 0} mass difference ({Delta}M) distributions. The high-statistics sample of unmixed semileptonic D{sup 0} decays is used to model the {Delta}M distribution and time-dependence of mixed events directly from the data. Neural networks are used to select events and reconstruct the D{sup 0}. A result consistent with no charm mixing has been obtained, R{sub mix} = 0.0023 {+-} 0.0012 {+-} 0.0004. This corresponds to an upper limit of R{sub mix}
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:
Book Synopsis The Search for B+ to Tau+ Nu? at BaBar by :
Download or read book The Search for B+ to Tau+ Nu? at BaBar written by and published by . This book was released on 2007 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the decay B →?+?{sub?} using 288 fb−1 of data collected at the?(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. A sample of events with one reconstructed semileptonic B decay (B− → D{sup o}l−{bar?}{sub {ell}}X) is selected, and in the recoil a search for B+ →?+?{sub?} signal is performed. The? is identified in the following channels:?+ → e+?{sub e}{bar?}{sub?},?+ →?+?{sub {mu}}{bar {nu}}{sub {tau}}, {tau}+ →?+?°{bar {nu}}{sub {tau}}. We measure a branching fraction of?(B+ → {tau}+{nu}{sub {tau}}) = 0.88{sub -0.67}{sup +0.68}(stat.) ± 0.11(syst.) x 10−4 and extract an upper limit on the branching fraction, at the 90% confidence level, of?(B+ → {tau}+{nu}{sub {tau}})
Book Synopsis A Search for the Rare Decay B-]tau+tau- at the BaBar Experiment by : Christopher Thomas Potter
Download or read book A Search for the Rare Decay B-]tau+tau- at the BaBar Experiment written by Christopher Thomas Potter and published by . This book was released on 2006 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model of particle physics predicts that the branching ratio for the rare decay B{sup 0} {yields} {tau}{sup +}{tau}{sup -} is 3.1 x 10{sup -8}, though untested models which could supersede it predict large enhancements. This dissertation describes the search for this rare decay in 210.4 fb{sup -1} of B{sup 0}{bar B}{sup 0} data collected at the {Upsilon}(4S) resonance in the Babar detector at the Stanford Linear Accelerator Center. In the analysis, one neutral B meson is fully reconstructed in a hadronic mode and recoil events which are consistent with each tau decaying in a mode {tau} {yields} {pi}{nu}, {rho}{nu}, or l{nu}{bar {nu}} are selected. There is no evidence for signal. The result is consistent with a downward fluctuation by 1.1 statistical standard deviations of the expected Standard Model background. Taking the expected background, the number of observed events and the expected statistical and systematic errors into account yields 2.7 x 10{sup -3} as the upper limit for B{sup 0} {yields} {tau}{sup +}{tau}{sup -} at the 90% confidence level.
Book Synopsis A Search for B+ --] Tau+ Nu Tau Recoiling Against B- --] D0 L- Nu-bar L X. by :
Download or read book A Search for B+ --] Tau+ Nu Tau Recoiling Against B- --] D0 L- Nu-bar L X. written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the decay B[sup+][yields][tau][sup+][nu][sub[tau]] in 88.9 x 10[sup 6][Upsilon](4S) decays recorded with the BABAR detector at the SLAC B-Factory. A sample of semi-exclusive, semi-leptonic B decays (B[sup -][yields] D[sup 0][ell][sup -][bar[nu]][sub[ell]]X), where X is either a photon, [pi][sup 0], or nothing, is used to identify the daughter particles that are associated with the other B meson in each event. These particles are searched for evidence of a one-prong leptonic B[sup+][yields][tau][sup+][nu][sub[tau]] decay. For this data sample we set a preliminary upper limit on the branching fraction of[Beta](B[sup+][yields][tau][sup+][nu][sub[tau]])
Book Synopsis A Search for B+ --] Tau + Nu Tau Recoiling Against B- --] D0 L- Nu-bar L X. by : Stephen J. Sekula
Download or read book A Search for B+ --] Tau + Nu Tau Recoiling Against B- --] D0 L- Nu-bar L X. written by Stephen J. Sekula and published by . This book was released on 2003 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the decay B{sup +} {yields} {tau}{sup +}{nu}{sub {tau}} in 88.9 x 10{sup 6} {Upsilon}(4S) decays recorded with the BABAR detector at the SLAC B-Factory. A sample of semi-exclusive, semi-leptonic B decays (B{sup -} {yields} D{sup 0}{ell}{sup -}{bar {nu}}{sub {ell}}X), where X is either a photon, {pi}{sup 0}, or nothing, is used to identify the daughter particles that are associated with the other B meson in each event. These particles are searched for evidence of a one-prong leptonic B{sup +} {yields} {tau}{sup +}{nu}{sub {tau}} decay. For this data sample we set a preliminary upper limit on the branching fraction of {Beta}(B{sup +} {yields} {tau}{sup +}{nu}{sub {tau}})
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 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the decay B− →?− {bar {nu}}{sub?} in a sample of 88.9 x 106 B{bar B}pairs recorded with the BABAR detector at the SLAC B-Factory. One of the two B mesons from the?(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− →?− {bar {nu}}{sub {tau}} decay. We find no evidence of a signal and set an upper limit on the branching fraction of?(B− → {tau}− {bar {nu}}{sub {tau}})
Book Synopsis A Search for B -] Tau Nu Recoiling Against B- -] D0 L- Nu X. by :
Download or read book A Search for B -] Tau Nu Recoiling Against B- -] D0 L- Nu X. written by and published by . This book was released on 2009 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a search for the decay B → l+?{sub l} (l =?,?, or e) in (458.9 ± 5.1) x 106 B{bar B} pairs recorded with the BABAR detector at the PEP-II B-Factory. They search for these B decays in a sample of B+B− events where one B-meson is reconstructed as B− → D°{ell}−{bar?}X. Using the method of Feldman and Cousins, they obtain?(B+ →?+?{sub {tau}}) = (1.7 ± 0.8 ± 0.2) x 10−4, which excludes zero at 2.3?. They interpret the central value in the context of the Standard Model and find the B meson decay constant to be f{sub B}2 = (62 ± 31) x 103 MeV2. They find no evidence for B+ → e+?{sub e} and B+ →?+?{sub?} and set upper limits at the 90% C.L.?(B+ → e+?{sub e})
Book Synopsis A Search for B --]?+?{sub {tau}} Recoiling Against B− --] D*°l−{bar {nu}}{sub {ell}} by :
Download or read book A Search for B --]?+?{sub {tau}} Recoiling Against B− --] D*°l−{bar {nu}}{sub {ell}} written by and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a search for the decay B -->?+?{sub?} in 124.1 x 106?(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− --> D*°l−{bar?}{sub {ell}}) is selected, and in the recoil a search for B+ -->?+?{sub?} signal is performed. The? is identified in the following channels:?+ --> e+?{sub e}{bar?}{sub?} -->?+?{sub {mu}}{bar?}{sub?},?+ -->?+{bar {nu}}{sub?}, {tau}+ -->?+?°{bar {nu}}{sub {tau}}, {tau}+ -->?+?−?+{bar {nu}}{sub {tau}}. The authors find no evidence of signal, and they set a preliminary upper limit on the branching fraction of B(B+ --> {tau}+{nu}{sub {tau}}) 4.3 x 10−4 at the 90% confidence level (CL). This result is then combined with a statistically independent BABAR search for B+ -- {tau}+{nu}{sub {tau}} to give a combined preliminary limit of B(B+ --> {tau}+{nu}{sub {tau}})
Book Synopsis Issues in General Physics Research: 2011 Edition by :
Download or read book Issues in General Physics Research: 2011 Edition written by and published by ScholarlyEditions. This book was released on 2012-01-09 with total page 8864 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues in General Physics Research / 2011 Edition is a ScholarlyEditions™ eBook that delivers timely, authoritative, and comprehensive information about General Physics Research. The editors have built Issues in General Physics Research: 2011 Edition on the vast information databases of ScholarlyNews.™ You can expect the information about General Physics Research in this eBook to be deeper than what you can access anywhere else, as well as consistently reliable, authoritative, informed, and relevant. The content of Issues in General Physics Research: 2011 Edition has been produced by the world’s leading scientists, engineers, analysts, research institutions, and companies. All of the content is from peer-reviewed sources, and all of it is written, assembled, and edited by the editors at ScholarlyEditions™ and available exclusively from us. You now have a source you can cite with authority, confidence, and credibility. More information is available at http://www.ScholarlyEditions.com/.
Book Synopsis Hadronic Tau Decay at BaBar by : O. Igonkina
Download or read book Hadronic Tau Decay at BaBar written by O. Igonkina and published by . This book was released on 2006 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent results on hadronic decays of tau from BaBar are reviewed. The branching fraction of {tau}{sup -} {yields} 3h{sup -} 2h{sup +}{nu}{sub {tau}} is measured to be (8.56 {+-} 0.05{sub stat} {+-} 0.42{sub sys}) x 10{sup -4}. The underlaying substructure of this decay exposes strong contribution from {rho} resonance. The decay {tau}{sup -} {yields} f{sub 1}(1285){pi}{sup -} {nu}{sub {tau}} with f{sub 1}(1285) {yields} 2{pi}{sup -}2{pi}{sup +} is observed and the corresponding branching fraction is measured to be (3.9 {+-} 0.7{sub stat} {+-} 0.5{sub sys}) x 10{sup -4}. The search for {tau}{sup -} {yields} 4{pi}{sup -}3{pi}{sup +}({pi}{sup 0}){nu}{sub {tau}} decay was performed and without evidence of the signal the upper limit of B({tau}{sup -} {yields} 4{pi}{sup -}3{pi}{sup +}({pi}{sup 0}){nu}{sub {tau}}) is estimated to be 3.0 x 10{sup -7} at 90% confidence limit. The upper limits on branching fractions for the exclusive decays {tau}{sup -} {yields} 4{pi}{sup -}3{pi}{sup +}{nu}{sub {tau}} and {tau}{sup -} {yields} 4{pi}{sup -}3{pi}{sup +}{pi}{sup 0}{nu}{sub {tau}} are found to be 4.3 x 10{sup -7} and 2.5 x 10{sup -7} at 90% confidence limit, respectively.
Book Synopsis B to K Nu Anti-Nu, B to Tau Nu, B to Mu Nu Searches at BABAR. by :
Download or read book B to K Nu Anti-Nu, B to Tau Nu, B to Mu Nu Searches at BABAR. written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Decay Tau - to Nu Tau Eta Pi- by : The ARGUS Collaboration
Download or read book Search for the Decay Tau - to Nu Tau Eta Pi- written by The ARGUS Collaboration and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Rare Multi-pion Decays of the Tau Lepton Using the BABAR Detector by : Ruben Ter-Antonyan
Download or read book Search for Rare Multi-pion Decays of the Tau Lepton Using the BABAR Detector written by Ruben Ter-Antonyan and published by . This book was released on 2006 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: A search for the decay of the tau lepton to rare multi-pion final states is performed using the BABAR detector at the PEP-II asymmetric-energy ee− collider. The analysis uses 232 fb−1 of data at center-of-mass energies on or near the Upsilon(4S) resonance. In the search for the tau− -> 5pi−2pi2pi0nu[tau] decay, we observe 10 events with an expected background of 6.5+2̇0−1.4 events. In the absence of a signal, we calculate the decay branching ratio upper limit B(tau− -> 5pi−2pi+2pi0nu[tau]) 3.4x10−6 at 90% confidence level. This is more than a factor of 30 improvement over the previously established limit. In addition, we search for the exclusive decay mode tau− - 2omega.pi−nu[tau] with the further decay of omega -> pi−pi+pi0. We observe 1 event, expecting 0.4+1̇0−0.4 background events, and calculate the upper limit B(tau− -> 2omega.pi−nu[tau])
Book Synopsis A Search for B[sup +] --] [tau][sup +][nu][sub [tau] Recoiling Against B[sup -] --] D*[sup 0][ell][sup -][bar [nu][sub [ell]]. by :
Download or read book A Search for B[sup +] --] [tau][sup +][nu][sub [tau] Recoiling Against B[sup -] --] D*[sup 0][ell][sup -][bar [nu][sub [ell]]. written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a search for the decay B[sup +] --> [tau][sup +][nu][sub [tau]] in 124.1 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 -] --> D*[sup 0][ell][sup -][bar [nu]][sub [ell]]) is selected, and in the recoil a search for B[sup +] --> [tau][sup +][nu][sub [tau]] signal is performed. The [tau] is identified in the following channels: [tau][sup +] --> e[sup +][nu][sub e][bar [nu]][sub [tau]] --> [mu][sup +][nu][sub [mu]][bar [nu]][sub [tau]], [tau][sup +] --> [pi][sup +][bar [nu]][sub [tau]], [tau][sup +] --> [pi][sup +][pi][sup 0][bar [nu]][sub [tau]], [tau][sup +] --> [pi][sup +][pi][sup -][pi][sup +][bar [nu]][sub [tau]]. The authors find no evidence of signal, and they set a preliminary upper limit on the branching fraction of B(B[sup +] --> [tau][sup +][nu][sub [tau]]) 4.3 x 10[sup -4] at the 90% confidence level (CL). This result is then combined with a statistically independent BABAR search for B[sup +] -- [tau][sup +][nu][sub [tau]] to give a combined preliminary limit of B(B[sup +] --> [tau][sup +][nu][sub [tau]])
Download or read book B Decays written by Sheldon Stone and published by World Scientific. This book was released on 1994 with total page 676 pages. Available in PDF, EPUB and Kindle. Book excerpt: This 2nd edition is an extensive update of "B Decays?. The revisions are necessary because of the extensive amount of new data and new theoretical ideas. This book reviews what is known about b-quark decays and also looks at what can be learned in the future.The importance of this research area is increasing, as evidenced by the approval of the luminosity upgrade for CESR and the asymmetric B factories at SLAC and KEK, and the possibility of experiments at hadron colliders.The key experimental observations made thus far, measurement of the lifetimes of the different B species, B0-B0 mixing, the discovery of ?Penguin? mediated decays, and the extraction of the CKM matrix elements Vub and Vcb from semileptonic decays, as well as more mundane results, are described in great detail by the experimentalists who have been closely involved with making the measurements. Theoretical progress in understanding b-quark decays using HQET and lattice gauge techniques are described by theorists who have developed and used these techniques.Synthesizing the experimental and theoretical information, several articles discuss the implications for the ?Standard Model? and how further tests can be done using measurements of CP violation in the B system.
Book Synopsis Search for the Decay $\tau^- \rightarrow 3\pi^- 2\pi^+2\pi^0 \nu_\tau$ by : B. Aubert
Download or read book Search for the Decay $\tau^- \rightarrow 3\pi^- 2\pi^+2\pi^0 \nu_\tau$ written by B. Aubert and published by . This book was released on 2006 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the decay of the {tau} lepton to five charged and two neutral pions is performed using data collected by the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider. The analysis uses 232 fb{sup -1} of data at center-of-mass energies on or near the {Upsilon}(4S) resonance. We observe 10 events with an expected background of 6.5{sub -1.4}{sup +2.0} events. In the absence of a signal, we set the limit on the branching ratio {Beta}({tau}{sup -} {yields} 3{pi}{sup -}2{pi}{sup +}2{pi}{sup 0}{nu}{sub {tau}})
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