Search For Semileptonic Decays In The B Meson Into The Lambda Subscript C Baryon
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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.
Evidence For B Semileptonic Decays Into The Lambda C Charm Baryon
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Author :
language : en
Publisher:
Release Date : 2008
Evidence For B Semileptonic Decays Into The Lambda C Charm Baryon 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 the first evidence for B semileptonic decays into 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 ee− storage rings. Events are tagged by fully reconstructing one of the B mesons in a hadronic decay mode. We measure the relative branching fraction [Beta]({bar B} 2![Lambda]{sub c}+ Xl−{bar {nu}}{sub {ell}})/[Beta]({bar B} 2![Lambda]{sub c}+/{bar {Lambda}}{sub c}−X) = (3.2 ± 0.9{sub stat.} ± 0.9{sub syst.})%. The significance of the signal including the systematic uncertainty is 4.9 standard deviations.
Searches For The Baryon And Lepton Number Violating Decays B 0 Rightarrow Lambda C Ell B Rightarrow Lambda Ell And B Rightarrow Bar Lambda Ell
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Author :
language : en
Publisher:
Release Date : 2011
Searches For The Baryon And Lepton Number Violating Decays B 0 Rightarrow Lambda C Ell B Rightarrow Lambda Ell And B Rightarrow Bar Lambda Ell written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Searches for B mesons decaying to final states containing a baryon and a lepton are performed, where the baryon is either [Lambda]{sub c} or [Lambda] and the lepton is a muon or an electron. These decays violate both baryon and lepton number and would be a signature of physics beyond the standard model. No significant signal is observed in any of the decay modes, and upper limits in the range (3.2 - 520) x 10−8 are set on the branching fractions at the 90% confidence level.
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)
Study Of Semileptonic Decays Of B Mesons To Charmed Baryons
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Author :
language : en
Publisher:
Release Date : 2003
Study Of Semileptonic Decays Of B Mesons To Charmed Baryons written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Using data collected by the CLEO II detector at a center-of-mass energy on or near the[Upsilon](4S) resonance, we have determined the 90% confidence level upper limit[Beta]([bar B][yields][Lambda][sub c][sup+]e[sup -] X)/[Beta]([bar B][yields] ([Lambda][sub c][sup+] or[bar[Lambda]][sub c][sup -])X)
A Measurement Of The Lambda C Baryon Decays To Proton Kaon Pion Absolute Branching Fraction With The Babar Detector
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Author :
language : en
Publisher:
Release Date : 2004
A Measurement Of The Lambda C Baryon Decays To Proton Kaon Pion Absolute Branching Fraction With The Babar Detector written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with categories.
A measurement of [Beta]([Lambda][sub c][sup +] [yields] pK[sup -] [pi][sup +]) is presented based on data collected with the BaBar detector at the Stanford Linear Accelerator Center. Branching fraction measurements represent a large portion of what is known about short-lived particles, the strong force that binds them, and the weak force that causes them to decay. While the majority of branching fraction measurements are done as ratios between two decay modes, it is the absolute measurements of a few particular decay modes that set the scale for these relative measurements. The [Lambda][sub c][sup +] particle is one of the four weakly decaying hadrons into which more than 90% of the known heavy quark hadrons will eventually decay. Thus, an absolute measurement of the branching fraction for [Lambda][sub c][sup +] [yields] pK[sup -][pi][sup +] is important for many studies of the heavy quark sector, from spectroscopy to B meson decays. The number of produced [Lambda][sub c][sup +]'s is inferred from the number of events reconstructed with an antiproton and an accompanying D meson. The final result of [Beta]([Lambda][sub c][sup +] [yields] pK[sup -] [pi][sup +]) = [6.12 [+-] 0.31(stat.) [+-] 0.42(syst.)]% represents more than a two-fold improvement in precision over the world average. The dominant source of systematic uncertainty is the irreducible background of [Xi][sub c] baryons.
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"--
Semileptonic Decays Of The B Subscript C Meson In The Quark Meson Effective Theory Microform
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Author : Matthew A. (Matthew Alton) Nobes
language : en
Publisher: National Library of Canada = Bibliothèque nationale du Canada
Release Date : 1999
Semileptonic Decays Of The B Subscript C Meson In The Quark Meson Effective Theory Microform written by Matthew A. (Matthew Alton) Nobes and has been published by National Library of Canada = Bibliothèque nationale du Canada this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Lepton interactions categories.
Search For Decays Of The Lambda B Baryon
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Author :
language : en
Publisher:
Release Date : 2011
Search For Decays Of The Lambda B Baryon written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Observation And Study Of B Meson Decays With Lambda C Baryons With The Babar Detector
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Author :
language : en
Publisher:
Release Date : 2013
Observation And Study Of B Meson Decays With Lambda C Baryons With The Babar Detector written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.