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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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 Baryon Number And Lepton Number Violating Decays Of Lambda Hyperons Using The Clas Detector At Jefferson Laboratory
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Author :
language : en
Publisher:
Release Date : 2015
Search For Baryon Number And Lepton Number Violating Decays Of Lambda Hyperons Using The Clas Detector At Jefferson Laboratory written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
We present a search for ten baryon-number violating decay modes of $\Lambda$ hyperons using the CLAS detector at Jefferson Laboratory. Nine of these decay modes result in a single meson and single lepton in the final state ($\Lambda \rightarrow m \ell$) and conserve either the sum or the difference of baryon and lepton number ($B \pm L$). The tenth decay mode ($\Lambda \rightarrow \bar{p}\pi^+$) represents a difference in baryon number of two units and no difference in lepton number. We observe no significant signal and set upper limits on the branching fractions of these reactions in the range $(4-200)\times 10^{-7}$ at the $90\%$ confidence level.
Search For The Baryon And Lepton Number Violating Decays Tau To Lambda H
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Author : B. Aubert
language : en
Publisher:
Release Date : 2006
Search For The Baryon And Lepton Number Violating Decays Tau To Lambda H written by B. Aubert and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
The authors have searched for the violation of baryon number B and lepton number L in the (B-L)-conserving modes {tau}{sup -} {yields} {bar {Lambda}}{sup 0}{pi}{sup -} and {tau}{sup -} {yields} {bar {Lambda}}{sup 0}K{sup -} as well as the (B-L)-violating modes {tau}{sup -} {yields} {Lambda}{sup 0}{pi}{sup -} and {tau}{sup -} {yields} {Lambda}{sup 0}K{sup -} using 237 fb{sup -1} of data collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} storage ring. They do not observe any signal and determine preliminary upper limits on the branching fractions {Beta}({tau}{sup -} {yields} {bar {Lambda}}{sup 0}{pi}{sup -})
Rare Exclusive Dileptonic And Radiative Decays Of Lambda Subscript B Baryons In A Quark Model
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Author : Lonnie James Mott
language : en
Publisher:
Release Date : 2011
Rare Exclusive Dileptonic And Radiative Decays Of Lambda Subscript B Baryons In A Quark Model written by Lonnie James Mott 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.
ABSTRACT: Hadronic form factors for the rare weak transitions [Lambda][subscript b] [rightarrow] [Lambda][superscript (*)] are calculated using a nonrelativistic quark model. The form factors are extracted in two ways. An analytic extraction using single component wave functions (SCA) with the quark current being reduced to its nonrelativistic Pauli form is employed in the first method. In the second method, the form factors are extracted numerically using the full quark model wave function (MCN) with the full relativistic form of the quark current. Both sets of form factors are found to satisfy the relationships expecetd from the heavy quark effective theory (HQET). Differential decay rates, branching ratios and forward-backward asymmetries (FBAs) are calculated for the dileptonic decays [Lambda][subscript b][rightarrow] [Lambda][superscript (*)][ell]+[ell]-, for transitions to both ground state and excited daughter baryons. Inclusion of the long distance contributions from charmonium resonances significantly enhances the decay rates. It is found that in the MCN model the [Lambda](1600) mode is the dominant mode in the [mu] channel when charmonium resonances are considered; the [Lambda](1520) mode is also found to have a comparable branching ratio to that of the ground state in the [mu] channel. It has been found that the FBAs for decays to [Lambda](1115), [Lambda](1600) and [Lambda](1405) are less sensitive to the form of the form factors in certain kinematic regions.
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.
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.
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.
Lepton And Baryon Number Violation In Particle Physics Astrophysics And Cosmology
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Author : H. V. Klapdor-Kleingrothaus
language : en
Publisher: CRC Press
Release Date : 1999-01-01
Lepton And Baryon Number Violation In Particle Physics Astrophysics And Cosmology written by H. V. Klapdor-Kleingrothaus and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-01-01 with Science categories.
Bringing together leading researchers from particle physics, astrophysics, and cosmology, Lepton and Baryon Number Violation in Particle Physics, Astrophysics and Cosmology presents reviews of current theoretical ideas, experimental results, and future perspectives in this topical field. The book covers areas related to baryon number (B) and lepton number (L) violation in particle physics, nuclear physics, rare decays, and cosmology. The main topics include B and L violation and grand unified theories; B and L violation in the early universe, cosmology, and astrophysics; Lepton family number violation; and B and L violation and collider physics.
Determination Of The Branching Fraction For B Rightarrow X Sub C Ell Nu Decays And Of Verticalv Sub Cb Vertical From Hadronic Mass And Lepton Energy Moments
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Author :
language : en
Publisher:
Release Date : 2004
Determination Of The Branching Fraction For B Rightarrow X Sub C Ell Nu Decays And Of Verticalv Sub Cb Vertical From Hadronic Mass And Lepton Energy Moments 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.
We determine the inclusive B [yields] X[sub c][ell][nu] branching fraction, [Beta][sub c[ell][nu]], the CKM matrix element V[sub cb], and other heavy-quark parameters from a simultaneous fit to moments of the hadronic-mass and lepton-energy distributions in semileptonic B-meson decays, measured as a function of the lower limit on the lepton energy, using data recorded with the BABAR detector. Using Heavy Quark Expansions (HQEs) to order 1/m[sub b][sup 3], we extract [Beta][sub ce[nu]] = (10.61 [+-] 0.16[sub exp] [+-] 0.06[sub HQE])% and V[sub cb] = (41.4 [+-] 0.4[sub exp] [+-] 0.4[sub HQE] [+-] 0.6[sub th]) x 10[sup -3]. The stated errors refer to the experimental, HQE, and additional theoretical uncertainties.
Search For Lepton Flavor Violation In Tau Sup To Ell Sup Ell Sup Ell Sup
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Author : B. Aubert
language : en
Publisher:
Release Date : 2003
Search For Lepton Flavor Violation In Tau Sup To Ell Sup Ell Sup Ell Sup written by B. Aubert 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.
A search for the lepton-flavor-violating decay of the tau into three charged leptons has been performed using 91.5 fb{sup -1} of data collected at an e{sup +}e{sup -} center-of-mass energy of 10.58 GeV with the BABAR detector at the PEP-II storage ring. In all six decay modes considered, the numbers of events found in data are compatible with the background expectations. Upper limits on the branching fractions are set in the range (1-3) x 10{sup -7} at 90% confidence level.