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Title: B Decays Involving Light Mesons

Abstract

Recent BABAR results for decays of B-mesons to combinations of non-charm mesons are presented. This includes B decays to two vector mesons, B {yields} {eta}{prime}({pi}, K, {rho}) modes, and a comprehensive Dalitz Plot analysis of B {yields} KKK decays.

Authors:
;
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
897441
Report Number(s):
SLAC-PUB-12280
TRN: US0701508
DOE Contract Number:
AC02-76SF00515
Resource Type:
Conference
Resource Relation:
Conference: Invited talk at 9th International Workshop on Meson Production, Properties and Interaction (MESON 2006), Cracow, Poland, 9-13 Jun 2006
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B MESONS; DALITZ PLOT; MESONS; PRODUCTION; VECTOR MESONS; Experiment-HEP,HEPEX

Citation Formats

Eschrich, Ivo Gough, and /UC, Irvine. B Decays Involving Light Mesons. United States: N. p., 2007. Web.
Eschrich, Ivo Gough, & /UC, Irvine. B Decays Involving Light Mesons. United States.
Eschrich, Ivo Gough, and /UC, Irvine. Tue . "B Decays Involving Light Mesons". United States. doi:. https://www.osti.gov/servlets/purl/897441.
@article{osti_897441,
title = {B Decays Involving Light Mesons},
author = {Eschrich, Ivo Gough and /UC, Irvine},
abstractNote = {Recent BABAR results for decays of B-mesons to combinations of non-charm mesons are presented. This includes B decays to two vector mesons, B {yields} {eta}{prime}({pi}, K, {rho}) modes, and a comprehensive Dalitz Plot analysis of B {yields} KKK decays.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Jan 09 00:00:00 EST 2007},
month = {Tue Jan 09 00:00:00 EST 2007}
}

Conference:
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  • The hadronic charmless B decays into a scalar meson and a pseudoscalar meson are studied within the framework of QCD factorization. Based on the QCD sum rule method, we have derived the leading-twist light-cone distribution amplitudes of scalar mesons and their decay constants. Although the light scalar mesons f{sub 0}(980) and a{sub 0}(980) are widely perceived as primarily the four-quark bound states, in practice it is difficult to make quantitative predictions based on the four-quark picture for light scalars. Hence, predictions are made in the 2-quark model for the scalar mesons. The short-distance approach suffices to explain the observed largemore » rates of f{sub 0}(980)K{sup -} and f{sub 0}(980)K{sup 0} that receive major penguin contributions from the b{yields}sss process. When f{sub 0}(980) is assigned as a four-quark bound state, there exist extra diagrams contributing to B{yields}f{sub 0}(980)K. Therefore, a priori the f{sub 0}(980)K rate is not necessarily suppressed for a four-quark state f{sub 0}(980). The predicted B{sup 0}{yields}a{sub 0}{sup {+-}}(980){pi}{sup {+-}} and a{sub 0}{sup +}(980)K{sup -} rates exceed the current experimental limits, favoring a four-quark nature for a{sub 0}(980). The penguin-dominated modes a{sub 0}(980)K and a{sub 0}(1450)K receive predominant weak annihilation contributions. There exists a twofold experimental ambiguity in extracting the branching ratio of B{sup -}{yields}K{sub 0}*{sup 0}(1430){pi}{sup -}, which can be resolved by measuring other K{sub 0}*(1430){pi} modes in conjunction with the isospin symmetry consideration. Large weak annihilation contributions are needed to explain the K{sub 0}*(1430){pi} data. The decay B{sup 0}{yields}{kappa}{sup +}K{sup -} provides a nice ground for testing the 4-quark and 2-quark nature of the {kappa} meson. It can proceed through W-exchange and hence is quite suppressed if {kappa} is made of two quarks, while it receives a tree contribution if {kappa} is predominately a four-quark state. Hence, an observation of this channel at the level of > or approx. 10{sup -7} may imply a four-quark assignment for the {kappa}. Mixing-induced CP asymmetries in penguin-dominated modes are studied and their deviations from sin2{beta} are found to be tiny.« less
  • We present a vector dominance model to describe radiative decays involving the light scalar mesons. Assuming that the light scalar mesons form a nonet this model gives relations among various decay amplitudes of the form S--> gamma gamma, V-->Sgamma and S--> Vgamma, where S and V denote scalar and vector mesons. By comparing with experimental radiative decay rates, including those recently measured for phi--> PP'gamma, we obtain various predictions. We discuss briefly ongoing extensions of the present work in an attempt to describe the radiative phi decay measurements in detail.
  • We summarize some features of the vector meson dominance model which was recently proposed for studying radiative decays involving the scalar mesons. Using the experimental values of {Gamma}(a{sub 0} {yields} {gamma}{gamma}), {Gamma}(f{sub 0} {yields} {gamma}{gamma}) and {Gamma}({phi} {yields} a{sub 0}{gamma}) as inputs, we show that the model predicts a large hierarchy between {Gamma}(a{sub 0} {yields} {omega}{gamma}) and {Gamma}(a{sub 0} {yields} {rho}{gamma}) as well as between {Gamma}(f{sub 0} {yields} {omega}{gamma}) and {Gamma}(f{sub 0} {yields} {rho}{gamma}).
  • The author calculates the form factors describing semileptonic and penguin induced decays of B mesons into light pseudoscalar and vector mesons. The form factors are calculated from QCD sum rules on the light-cone including contributions up to twist 4, radiative corrections to the leading twist contribution and SU(3) breaking effects. The theoretical uncertainty is estimated to be tilde (15--20)%.
  • No abstract prepared.