Rare Exclusive Dileptonic And Radiative Decays Of Lambda Subscript B Baryons In A Quark Model
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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.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1993-04
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993-04 with Science categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Inis Atomindex
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Author :
language : en
Publisher:
Release Date : 1986
Inis Atomindex written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Nuclear energy categories.
Government Reports Annual Index
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Author :
language : en
Publisher:
Release Date : 1992
Government Reports Annual Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1992 with Government publications categories.
High Energy Physics Index
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Author :
language : en
Publisher:
Release Date : 1990
High Energy Physics Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Nuclear physics categories.
Semileptonic Decays Of Heavy Lambda Baryons In A Quark Model
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Author :
language : en
Publisher:
Release Date : 2005
Semileptonic Decays Of Heavy Lambda Baryons In A Quark Model written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005 with categories.
The semileptonic decays of [Lambda]{sub c} and [Lambda]{sub b} are treated in the framework of a constituent quark model. Both nonrelativistic and semirelativistic Hamiltonians are used to obtain the baryon wave functions from a fit to the spectra, and the wave functions are expanded in both the harmonic oscillator and Sturmian bases. The latter basis leads to form factors in which the kinematic dependence on q2 is in the form of multipoles, and the resulting form factors fall faster as a function of q2 in the available kinematic ranges. As a result, decay rates obtained in the two models using the Sturmian basis are significantly smaller than those obtained using the harmonic oscillator basis. In the case of the [Lambda]{sub c}, decay rates calculated using the Sturmian basis are closer to the experimentally reported rates. However, we find a semileptonic branching fraction for the [Lambda]{sub c} to decay to excited [Lambda]* states of 11% to 19%, in contradiction with what is assumed in available experimental analyses. Our prediction for the [Lambda]{sub b} semileptonic decays is that decays to the ground state [Lambda]{sub c} provide a little less than 70% of the total semileptonic decay rate. For the decays [Lambda]{sub b} → [Lambda]{sub c}, the analytic form factors we obtain satisfy the relations expected from heavy-quark effective theory at the non-recoil point, at leading and next-to-leading orders in the heavy-quark expansion. In addition, some features of the heavy-quark limit are shown to naturally persist as the mass of the heavy quark in the daughter baryon is decreased.
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.
Exclusive Semileptonic And Radiative Decays Of B Baryons To Light Baryons
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Author : William Alfredo Loinaz
language : en
Publisher:
Release Date : 1995
Exclusive Semileptonic And Radiative Decays Of B Baryons To Light Baryons written by William Alfredo Loinaz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with categories.
Excited Charm Baryons In Semileptonic Lambda Sub B Decay And Their Contribution To A Bjorken Sum Rule
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Author :
language : en
Publisher:
Release Date : 1991
Excited Charm Baryons In Semileptonic Lambda Sub B Decay And Their Contribution To A Bjorken Sum Rule written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with categories.
It has recently been shown that hadrons containing a single heavy quark exhibit a new flavor-spin symmetry of QCD. We exploit this symmetry to obtain model independent predictions for the form factors for the semileptonic decay of the Lambda(sub)b to the low-lying negative parity charm baryons. We discuss the connection between these results and the slope of the universal function Zeta that determines the Lambda(sub)b->Lambda(sub)c weak form factors.