Search For Bbar To Lambda C X L Nu Decays In Events With A Fully Reconstructed B Meson
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Search For Bbar To Lambda C X L Nu Decays In Events With A Fully Reconstructed B Meson
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Author :
language : en
Publisher:
Release Date : 2012
Search For Bbar To Lambda C X L Nu Decays In Events With A Fully Reconstructed B Meson written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
We present a search for semileptonic B decays to the charmed baryon [Lambda]{sub c} based on 420 fb−1 of data collected at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II e+e− storage rings. By fully reconstructing the recoiling B in a hadronic decay mode, we reduce non-B backgrounds and determine the flavor of the signal B. We statistically correct the flavor for the effect of the B° mixing. We obtain a 90% confidence level upper limit of [Beta]({bar B} 2![Lambda]{sub c}+ Xl− {bar [nu]}{sub l})/[Beta]({bar B} 2![Lambda]{sub c}+ X)
Search For The Rare Decay Of A B Meson Into A Lambda Baryon Proton And Neutrino Antineutrino Pair At The Babar And Belle Ii Experiments
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Author : Robert Seddon
language : en
Publisher:
Release Date : 2019
Search For The Rare Decay Of A B Meson Into A Lambda Baryon Proton And Neutrino Antineutrino Pair At The Babar And Belle Ii Experiments written by Robert Seddon and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
"We present two analyses of the rare B- -> Lambda pbar nu nubar decay. Within the Standard Model, the process B- -> Lambda pbar nu nubar is permitted but highly suppressed, with an expected branching fraction of (7.9 +/- 1.9) x 10^-7. This rarity makes it a sensitive probe for the existence of new physics, which may be discoverable in the form of a higher than predicted branching fraction.The first analysis is conducted on data collected at the BABAR experiment, which ran from 1999-2008. BABAR collected 433 fb^-1 of integrated luminosity at the Upsilon(4S) resonance; Upsilon(4S) decays almost exclusively into B-Bbar pairs, and this analysis uses hadronic tag reconstruction to fully reconstruct one of the B-mesons in this pair. The search for B- -> Lambda pbar nu nubar is then conducted among the decay products of the second, unreconstructed B-meson. Using both real data and Monte Carlo simulations, we develop and implement a signal selection that selects candidates conforming to the expected characteristics of B- -> Lambda pbar nu nubar decays. The result of the analysis is an upper limit on the branching fraction at the 90% confidence level of 3.02 x 10^-5. This is the world's first experimental result in the search for B- -> Lambda pbar nu nubar decays.The second analysis is conducted on Monte Carlo simulations of data that will be collected at Belle II, the world's only next-generation B-meson facility. Over its lifetime Belle II will collect 50 ab^-1 of data, approximately 100 times that of BABAR. This increase in data, along with more capable hardware and software, should allow Belle II to search for B- -> Lambda pbar nu nubar decays with greater sensitivity than BABAR. Using a simulated dataset equivalent in size to that used in our BABAR study, we employ Full Event Interpretation to fully reconstruct the decay of one B-meson in each B-Bbar pair, and conduct our signal selection in the remainder of the data. The result of the analysis is a predicted upper limit on the branching fraction at the 90% confidence level of 1.2 x 10^-4. A comparison of the Belle II and BABAR results highlights several areas where Belle II will need to improve in order to make best use of its projected dataset"--
Measurement Of The Branching Fractions Of Bbar D L Nubar L Decays In Events Tagged By A Fully Reconstructed B Meson
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Author :
language : en
Publisher:
Release Date : 2008
Measurement Of The Branching Fractions Of Bbar D L Nubar L Decays In Events Tagged By A Fully Reconstructed B Meson written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
We report a measurement of the branching fractions of {bar B} 2!D** l−{bar {nu}}{sub l} decays based on 417 fb−1 of data collected at the [Upsilon](4S) resonance with the BABAR detector at the PEP-II ee− storage rings. Events are selected by fully reconstructing one of the B mesons in a hadronic decay mode. A fit to the invariant mass differences m(D{sup (*)})-m(D{sup (*)}) is performed to extract the signal yields of the different D** states. We observe the {bar B} 2!D**{ell}−{bar {nu}}{sub {ell}} decay modes corresponding to the four D** states predicted by Heavy Quark Symmetry with a significance greater than six standard deviations including systematic uncertainties.
Measurement Of The Relative Branching Fractions Of Bbar To D D D L Nubar L Decays In Events With A Fully Reconstructed B Meson
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Author :
language : en
Publisher:
Release Date : 2007
Measurement Of The Relative Branching Fractions Of Bbar To D D D L Nubar L Decays In Events With A Fully Reconstructed B Meson written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
We determine the relative branching fractions of semileptonic B decays to charmed final states. The measurement is performed on the recoil from a fully reconstructed B meson in a sample of 362 million B{bar B} pairs collected at the [Upsilon](4S) resonance with the BABAR detector. A simultaneous fit to a set of discriminating variables is performed on a sample of {bar B} → DXl−{bar {nu}}{sub {ell}} decays to determine the contributions from the different channels.
Study Of Bbar To Xu L Nubar Decays In Bbbar Events Tagged By A Fully Reconstructed B Meson Decay And Determination Of
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Author :
language : en
Publisher:
Release Date : 2012
Study Of Bbar To Xu L Nubar Decays In Bbbar Events Tagged By A Fully Reconstructed B Meson Decay And Determination Of written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
We report measurements of partial branching fractions for inclusive charmless semileptonic B decays {bar B} → X{sub u}l{bar {nu}}, and the determination of the CKM matrix element.
Search For Semileptonic Decays In The B Meson Into The Lambda Subscript C Baryon
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Author : Tomohiko Tanabe
language : en
Publisher:
Release Date : 2009
Search For Semileptonic Decays In The B Meson Into The Lambda Subscript C Baryon written by Tomohiko Tanabe and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
The Search For Rare Non Hadronic B Meson Decays With Final State Neutrinos Using The Babar Detector
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Author : Dana Lindemann
language : en
Publisher:
Release Date : 2012
The Search For Rare Non Hadronic B Meson Decays With Final State Neutrinos Using The Babar Detector written by Dana Lindemann and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
"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." --
Model Independent Results For The Decay B To L Nu L Gamma At Babar
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Author :
language : en
Publisher:
Release Date : 2012
Model Independent Results For The Decay B To L Nu L Gamma At Babar written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
We present a search for the radiative leptonic decays B+ → e?{sub e}? and B+ →?+?{sub?}? using data collected by the BABAR detector at the PEP-II B factory. We fully reconstruct the hadronic decay of one of the B mesons in?(4S) → B+B− and then search for evidence of the signal decay within the rest of the event. This method provides clean kinematic information on the signal's missing energy and high momentum photon and lepton, and allows for a model-independent analysis of this decay. Using a data sample of 465 million B-meson pairs, we obtain sensitivity to branching fractions of the same order as predicted by the Standard Model. We report a model-independent branching fraction upper limit of?(B+ → l+?{sub l}?)
Search For B K Nu Anti Nu Decays
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Author :
language : en
Publisher:
Release Date : 2008
Search For B K Nu Anti Nu Decays written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
We present a search for the decays B → K*?{bar?} using 454 x 106 B{bar B} pairs collected at the?(4S) resonance with the BABAR detector at the SLAC PEP-II B-Factory. We first select an event sample where one B is reconstructed in a semileptonic or hadronic mode with one charmed meson. The remaining particles in the event are then examined to search for a B → K*?{bar?} decay. The charged K* is reconstructed as K* → K{sub S}°?+ or K*+ → K+?°; the neutral K* is identified in K*° → K+?− mode. We establish upper limits at 90% confidence level of?(B+ → K*+?{bar {nu}})
A Search For The Decays B Arrow L Nu And B Degree Arrow L Tau L
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Author : Miika A. Klemetti
language : en
Publisher:
Release Date : 2007
A Search For The Decays B Arrow L Nu And B Degree Arrow L Tau L written by Miika A. Klemetti and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.
"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])