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Title: CP asymmetry in B{sup 0}(t){yields}K{sub S}{pi}{sup 0}{gamma} in the standard model

Abstract

The time-dependent CP asymmetry in exclusive B{sup 0}(t){yields}K*{sup 0}{gamma} decays has been proposed as a probe of new physics in B decays. Recently, this method was extended to radiative decays into multibody hadronic final states such as B{sup 0}(t){yields}K{sub S}{pi}{sup 0}{gamma} and B{sup 0}(t){yields}{pi}{sup +}{pi}{sup -}{gamma}. The CP asymmetry in these decays vanishes to the extent that the photon is completely polarized. In the standard model, the photon emitted in b{yields}s{gamma} has high left-handed polarization, but right-handed contamination enters already at leading order in {lambda}/m{sub b} even for vanishing light quark masses. We compute here the magnitude of this effect and the time-dependent CP asymmetry parameter S{sub K{sub S}}{sub {pi}}{sub {sup 0}}{sub {gamma}}. We find that the standard model can easily accommodate values of S as large as 10%, but a precise value cannot be obtained at present because of strong interactions uncertainties.

Authors:
;  [1];  [2]
  1. Department of Physics, University of California at San Diego, La Jolla, California 92093 (United States)
  2. (United States)
Publication Date:
OSTI Identifier:
20774598
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevD.73.014013; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ASYMMETRY; B NEUTRAL MESONS; B QUARKS; CP INVARIANCE; D QUARKS; HADRONIC PARTICLE DECAY; PHOTONS; PIONS MINUS; PIONS PLUS; POLARIZATION; RADIATIVE DECAY; REST MASS; S QUARKS; STANDARD MODEL; STRONG INTERACTIONS; TIME DEPENDENCE; U QUARKS

Citation Formats

Grinstein, Benjamin, Pirjol, Dan, and Center for Theoretical Physics, Massachusetts Institute for Technology, Cambridge, Massachusetts 02139. CP asymmetry in B{sup 0}(t){yields}K{sub S}{pi}{sup 0}{gamma} in the standard model. United States: N. p., 2006. Web. doi:10.1103/PhysRevD.73.014013.
Grinstein, Benjamin, Pirjol, Dan, & Center for Theoretical Physics, Massachusetts Institute for Technology, Cambridge, Massachusetts 02139. CP asymmetry in B{sup 0}(t){yields}K{sub S}{pi}{sup 0}{gamma} in the standard model. United States. doi:10.1103/PhysRevD.73.014013.
Grinstein, Benjamin, Pirjol, Dan, and Center for Theoretical Physics, Massachusetts Institute for Technology, Cambridge, Massachusetts 02139. Sun . "CP asymmetry in B{sup 0}(t){yields}K{sub S}{pi}{sup 0}{gamma} in the standard model". United States. doi:10.1103/PhysRevD.73.014013.
@article{osti_20774598,
title = {CP asymmetry in B{sup 0}(t){yields}K{sub S}{pi}{sup 0}{gamma} in the standard model},
author = {Grinstein, Benjamin and Pirjol, Dan and Center for Theoretical Physics, Massachusetts Institute for Technology, Cambridge, Massachusetts 02139},
abstractNote = {The time-dependent CP asymmetry in exclusive B{sup 0}(t){yields}K*{sup 0}{gamma} decays has been proposed as a probe of new physics in B decays. Recently, this method was extended to radiative decays into multibody hadronic final states such as B{sup 0}(t){yields}K{sub S}{pi}{sup 0}{gamma} and B{sup 0}(t){yields}{pi}{sup +}{pi}{sup -}{gamma}. The CP asymmetry in these decays vanishes to the extent that the photon is completely polarized. In the standard model, the photon emitted in b{yields}s{gamma} has high left-handed polarization, but right-handed contamination enters already at leading order in {lambda}/m{sub b} even for vanishing light quark masses. We compute here the magnitude of this effect and the time-dependent CP asymmetry parameter S{sub K{sub S}}{sub {pi}}{sub {sup 0}}{sub {gamma}}. We find that the standard model can easily accommodate values of S as large as 10%, but a precise value cannot be obtained at present because of strong interactions uncertainties.},
doi = {10.1103/PhysRevD.73.014013},
journal = {Physical Review. D, Particles Fields},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 2006},
month = {Sun Jan 01 00:00:00 EST 2006}
}