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Search For The Rare Leptonic Decays B To L Nu L L
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Book Synopsis Search for the Rare Leptonic Decay B+ -] Mu+ Nu[sub Mu]. by :
Download or read book Search for the Rare Leptonic Decay B+ -] Mu+ Nu[sub Mu]. written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have performed a search for the rare leptonic decay B[sup +] [yields] [mu][sup +][nu][sub [mu]] with data collected at the [Upsilon](4S) resonance by the BABAR experiment at the PEP-II storage ring. In a sample of 88.4 million B[bar B] pairs, we find no significant evidence for a signal and set an upper limit on the branching fraction [Beta](B[sup +] [yields] [mu][sup +] [nu][sub [mu]])
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 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 A Search for the Rare and Forbidden Decays D0 2!V L+ L- by :
Download or read book A Search for the Rare and Forbidden Decays D0 2!V L+ L- written by and published by . This book was released on 2003 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: I report the results of a search for flavor-changing neutral current, leptonflavor, and lepton-number violating decays of the 3 and 4-body decay modes of the D0 (and its antiparticle) containing muons and electrons. Using data from Fermilab charm hadroproduction experiment E791, I examine modes with two leptons and either a [rho]0, $\bar{K}$0, or [Phi] vector meson or a non-resonant [pi][pi], K[pi], or KK pair of pseudoscalar mesons. No evidence for any of these decays is found. Therefore, branching-fraction upper limits, typically at the 10-4 level, are presented at the 90% confidence level for the 27 decay modes examined. Of these searches, 18 are investigations of decays without previous published results; several others have significantly improved sensitivity over previous results.
Book Synopsis Search for the Rare Leptonic Decays B+̂ \to L+̂ \nu_l (l by :
Download or read book Search for the Rare Leptonic Decays B+̂ \to L+̂ \nu_l (l written by and published by . This book was released on 2009 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have performed a search for the rare leptonic decays B → l+?{sub l}({ell} = e,?), using data collected at the?(4S) resonance by the BABAR detector at the PEP-II storage ring. In a sample of 468 x 106 B{bar B} pairs we find no evidence for a signal and set an upper limit on the branching fractions B(B+ → e+?{sub e})
Book Synopsis The Search for Rare Non-hadronic B-meson Decays with Final-state Neutrinos Using the BaBar Detector by : Dana Lindemann
Download or read book The Search for Rare Non-hadronic B-meson Decays with Final-state Neutrinos Using the BaBar Detector written by Dana Lindemann and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis presents the searches for two rare B meson decays: the radiative leptonic decay B+ -> l+ nu gamma (l = e, mu) and the flavor-changing neutral current B -> K(*) nu nubar. These searches use the full dataset collected by the BaBar experiment, which corresponds to almost 500 million BB pairs. After fully reconstructing the hadronic decay of one of the B mesons in Upsilon(4S) -> BB decays, evidence of B+ -> l+ nu gamma or B -> K(*) nu nubar is looked for in the rest of the event. No significant evidence of either signal decay is observed. Model-independent branching-fraction upper limits are set at BR(B ->e nu gamma)17 x10 {-6}, BR(B -mu nu gamma)24 x10 {-6}, and BR(B -l nu gamma)15.6 x10 {-6}, all at the 90% confidence level. These are currently the most stringent published upper limits for B+ - l+ nu gamma. In addition, branching-fraction upper limits are set at BR(B -> K+ nu nubar)3.7 x10 {-5}, BR(B - K0 nu nubar)8.0 x10 {-5}, BR(B - K*+ nu nubar)11.5 x10 {-5}, and BR(B - K*0 nu nubar)9.2 x10 {-5}, all at the 90% confidence level. For additional sensitivity to New Physics contributions, partial B - K(*) nu nubar branching-fraction upper limits are also determined over the full kinematic range." --
Book Synopsis Search for the Rare Decay B -] K Nu Nubar by :
Download or read book Search for the Rare Decay B -] K Nu Nubar written by and published by . This book was released on 2010 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the rare decays B → K+?{bar?} and B° → K°?{bar?} using 459 million B{bar B} pairs collected with the BABAR detector at the SLAC National Accelerator Laboratory. Flavor-changing neutral-current decays such as these are forbidden at tree level but can occur through one-loop diagrams in the Standard Model (SM), with possible contributions from new physics at the same order. The presence of two neutrinos in the final state makes identification of signal events challenging, so reconstruction in the semileptonic decay channels B → D{sup (*)}l? of the B meson recoiling from the signal B is used to suppress backgrounds. We set an upper limit at the 90% confidence level of 1.3 x 10−5 on the total branching fraction for B+ → K+?{bar {nu}}, and 5.6 x 10−5 for B° → K°{nu}{bar {nu}}. We additionally report partial branching fractions in two ranges of di-neutrino mass squared for B+ → K+{nu}{bar {nu}}.
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 A Search for the Decays B+ Arrow] L+nu and B[degree]arrow L+ Tau- (l by : Miika A. Klemetti
Download or read book A Search for the Decays B+ Arrow] L+nu and B[degree]arrow L+ Tau- (l written by Miika A. Klemetti and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "We present searches for the leptonic decays B + [arrow] l+nu and the lepton flavor violating decays B[degree][arrow] l[symbol][tau][symbol], where l = e, [mu], with data collected by the BABAR experiment at SLAC. These searches utilize a technique in which we fully reconstruct the accompanying B̄ in [Upsilon](4S)[arrow] BB̄ events, and look for a monoenergetic lepton in the signal B frame. The signal yield in the data is extracted from a fit to the signal lepton candidate momentum distribution in the signal B rest frame. Using a data sample of approximately 378 million BB̄ pairs (342 fb-1), we find no evidence of signal in any of the decay modes. Branching fraction upper limits of B (B+[arrow] e +[nu])
Book Synopsis Searches for the Decays B0 to L+- Tau-+ and B+ to L+ Nu(L by :
Download or read book Searches for the Decays B0 to L+- Tau-+ and B+ to L+ Nu(L written by and published by . This book was released on 2008 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present searches for the leptonic decays B → l+? and the lepton flavor violating decays B° → l{sup {+-}}?{sup {-+}}, where l = e,?, with data collected by the BABAR experiment at SLAC. This search demonstrates a novel technique in which we fully reconstruct the accompanying {bar B} in?(4S) → B{bar B} events, and look for a monoenergetic lepton from the signal B decay. The signal yield is extracted from a fit to the signal lepton candidate momentum distribution in the signal B rest frame. Using a data sample of approximately 378 million B{bar B} pairs (342 fb−1), we find no evidence of signal in any of the decay modes. Branching fraction upper limits of?(B+ → e+?)
Download or read book Leptonic B Decays at BaBar written by and published by . This book was released on 2003 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present results on searches for the rare B decays B° → ll− (l = e or?) and B+ → K+?{bar?} in?(4S) decays. The data used in these analyses were collected with the BABAR detector at the PEP-II e+e− storage ring during the years 2000 and 2001. The B° → l+l− search was performed using an integrated luminosity of 54.4 fb−1 accumulated at the?(4S) resonance (about 60 million B{bar B} pairs) while the B+ → K+?{bar?} search was performed with 50.7 fb−1 (about 56 million B{bar B} pairs). Both analyses use an additional 6.4 fb−1 of data accumulated about 40 MeV below resonance. They see no evidence for a signal in either the B → l+l− or B → K+{nu}{bar {nu}} decay modes and set the following upper limits at the 90% CL:?(B° → e+e−)
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 Search for the Rare Decays $B\to H\nu\bar\nu}$ With Semileptonic Tag at the Belle Experiment by : Johannes Grygier
Download or read book Search for the Rare Decays $B\to H\nu\bar\nu}$ With Semileptonic Tag at the Belle Experiment written by Johannes Grygier and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Rare Decay B to Pi L+ L- by : B. Aubert
Download or read book Search for the Rare Decay B to Pi L+ L- written by B. Aubert and published by . This book was released on 2006 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present results of a search for the rare flavor-changing neutral-current decay B {yields} {pi}{ell}{sup +}{ell}{sup -}, based on a data sample corresponding to 209 fb{sup -1} of integrated luminosity collected with the BABAR detector at the PEP-II B Factory. They reconstruct the four exclusive B decay modes B{sup +} {yields} {pi}{sup +}{ell}{sup +}{ell}{sup -} and B{sup 0} {yields} {pi}{sup 0}{ell}{sup +}{ell}{sup -}, where {ell} is either an e or {mu}. They find no evidence for a signal, and they obtain the upper limit at 90% confidence level on the lepton-flavor-averaged branching fraction to be {Beta}(B{sup +} {yields} {pi}{sup +}{ell}{sup +}{ell}{sup -}) = 2 x {tau}B{sup +}/{tau}B{sup 0} {Beta}(B{sup 0} {yields} {pi}{sup 0}{ell}{sup +}{ell}{sup -})
Book Synopsis Rare Semi-leptonic B Meson Decays by : James David Lyon
Download or read book Rare Semi-leptonic B Meson Decays written by James David Lyon and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book חדושי רבי שמואל written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for the Rare and Forbidden Decays D0 {u2192} V L+ L-. by :
Download or read book A Search for the Rare and Forbidden Decays D0 {u2192} V L+ L-. written by and published by . This book was released on 2003 with total page 105 pages. Available in PDF, EPUB and Kindle. Book excerpt: I report the results of a search for flavor-changing neutral current, leptonflavor, and lepton-number violating decays of the 3 and 4-body decay modes of the D0 (and its antiparticle) containing muons and electrons. Using data from Fermilab charm hadroproduction experiment E791, I examine modes with two leptons and either a ?0, $\bar{K}$0, or ? vector meson or a non-resonant ?? , K? , or KK pair of pseudoscalar mesons. No evidence for any of these decays is found. Therefore, branching-fraction upper limits, typically at the 10-4 level, are presented at the 90% confidence level for the 27 decay modes examined. Of these searches, 18 are investigations of decays without previous published results; several others have significantly improved sensitivity over previous results.
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