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Rare B-decays in the standard model

Technical Report:

Abstract

We review theoretical work done in studies of the Flavour Changing Neutral Current (FCNC) B-decays in the context of the Standard Model. Making use of the QCD-improved effective Hamiltonian describing the so-called vertical stroke {Delta}Bvertical stroke =1 and vertical stroke {Delta}Bvertical stroke =2, vertical stroke {Delta}Qvertical stroke =0 transitions, we calculate the rates and differential distributions in a large number of B-decays. The FCNC processes discussed here include the radiative decays B {yields} X{sub s} + {gamma}, B {yields} X{sub d} + {gamma}, and the semileptonic decays B {yields} X{sub s} l{sup +}l{sup -}, B {yields} X{sub d}l{sup +}l{sup -}, B {yields} X{sub s} {nu}{sub l} anti {nu}{sub l}, and B {yields} X{sub d} {nu}{sub l} anti {nu}{sub l}. We also discuss the inclusive photon energy spectrum calculated from the Charged Current (CC) decays B {yields} X{sub c} + {gamma} and B {yields} X{sub u} + {gamma} and the mentioned FCNC radiative decays. The importance of carrying out measurements of the inclusive photon energy spectrum in B-decays is emphasized. Using phenomenological potential models and the Heavy Quark Effective Theory (HQET) we estimate decay branching ratios in a number of exclusive FCNC B-decays. Purely leptonic and photonic decays (B{sub d}, B{sub  More>>
Authors:
Ali, A; [1]  Greub, C; [2]  Mannel, T [3] 
  1. Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
  2. Zurich Univ. (Switzerland)
  3. Technische Hochschule Darmstadt (Germany)
Publication Date:
Feb 01, 1993
Product Type:
Technical Report
Report Number:
DESY-93-016; ZU-TH-4/93; IKDA-93/5
Reference Number:
SCA: 662350; 662390; PA: DEN-94:0FQ033; EDB-95:025857; SN: 95001315020
Resource Relation:
Other Information: PBD: Feb 1993
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; STANDARD MODEL; WEAK PARTICLE DECAY; RADIATIVE DECAY; B MESONS; SYMMETRY BREAKING; FLAVOR MODEL; QUANTUM CHROMODYNAMICS; LEPTONIC DECAY; SEMILEPTONIC DECAY; NEUTRAL-CURRENT INTERACTIONS; GAMMA SPECTRA; ENERGY SPECTRA; HAMILTONIANS; CHARGED-CURRENT INTERACTIONS; EXCLUSIVE INTERACTIONS; INCLUSIVE INTERACTIONS; BRANCHING RATIO; MATRIX ELEMENTS; KOBAYASHI-MASKAWA MATRIX; REST MASS; QUARKS; TOP PARTICLES; FERMI INTERACTIONS; PARTICLE WIDTHS; THEORETICAL DATA; EFFECTIVE MASS; MASS SPECTRA; E1-TRANSITIONS; M1-TRANSITIONS; BEAUTY PARTICLES; B NEUTRAL MESONS; B PLUS MESONS; STRANGE MESONS; 662350; 662390; DECAYS OF MESONS; ELECTROMAGNETIC PROCESSES AND PROPERTIES
OSTI ID:
10108294
Research Organizations:
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany)
Country of Origin:
Germany
Language:
English
Other Identifying Numbers:
Other: ON: DE95733431; TRN: DE94FQ033
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
36 p.
Announcement Date:
Jun 30, 2005

Technical Report:

Citation Formats

Ali, A, Greub, C, and Mannel, T. Rare B-decays in the standard model. Germany: N. p., 1993. Web.
Ali, A, Greub, C, & Mannel, T. Rare B-decays in the standard model. Germany.
Ali, A, Greub, C, and Mannel, T. 1993. "Rare B-decays in the standard model." Germany.
@misc{etde_10108294,
title = {Rare B-decays in the standard model}
author = {Ali, A, Greub, C, and Mannel, T}
abstractNote = {We review theoretical work done in studies of the Flavour Changing Neutral Current (FCNC) B-decays in the context of the Standard Model. Making use of the QCD-improved effective Hamiltonian describing the so-called vertical stroke {Delta}Bvertical stroke =1 and vertical stroke {Delta}Bvertical stroke =2, vertical stroke {Delta}Qvertical stroke =0 transitions, we calculate the rates and differential distributions in a large number of B-decays. The FCNC processes discussed here include the radiative decays B {yields} X{sub s} + {gamma}, B {yields} X{sub d} + {gamma}, and the semileptonic decays B {yields} X{sub s} l{sup +}l{sup -}, B {yields} X{sub d}l{sup +}l{sup -}, B {yields} X{sub s} {nu}{sub l} anti {nu}{sub l}, and B {yields} X{sub d} {nu}{sub l} anti {nu}{sub l}. We also discuss the inclusive photon energy spectrum calculated from the Charged Current (CC) decays B {yields} X{sub c} + {gamma} and B {yields} X{sub u} + {gamma} and the mentioned FCNC radiative decays. The importance of carrying out measurements of the inclusive photon energy spectrum in B-decays is emphasized. Using phenomenological potential models and the Heavy Quark Effective Theory (HQET) we estimate decay branching ratios in a number of exclusive FCNC B-decays. Purely leptonic and photonic decays (B{sub d}, B{sub s}) {yields} l{sup +}l{sup -} and (B{sub d}, B{sub s}) {yields} {gamma}{gamma} are also estimated. The principal interest in the studies of FCNC B-decays lies in their use in determining the parameters of the standard Model, in particular the CKM matrix elements and the top quark mass. The parametric dependence of these and other QCD-specific parameters on the rates and distributions is worked out numerically. (orig.)}
place = {Germany}
year = {1993}
month = {Feb}
}