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Title: Annihilation contributions and CP asymmetries in B{sup +}{yields}{pi}{sup +}K{sup 0}, K{sup +}K{sup 0} and B{sup 0}{yields}K{sup 0}K{sup 0}

Abstract

Recently the branching ratios for B{sup +}{yields}K{sup +}K{sup 0} and B{sup 0}{yields}K{sup 0}K{sup 0} have been measured. Data indicate that the annihilation amplitudes in these decays are not zero. A nonzero annihilation amplitude plays an important role in CP violation for B{sup +}{yields}{pi}{sup +}K{sup 0}, K{sup +}K{sup 0}. Using the measured branching ratios for these decays, we show that there is an absolute bound of 5% for the size of CP asymmetry in B{sup +}{yields}{pi}{sup +}K{sup 0} from a relation between the amplitudes of these decays. The size of CP asymmetry in B{sup +}{yields}K{sup +}K{sup 0} can, however, be as large as 90%. Future experimental data will test these predictions.

Authors:
;  [1];  [1];  [2]
  1. Department of Physics, Nankai University, Tianjin (China)
  2. (China)
Publication Date:
OSTI Identifier:
21011024
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevD.75.037501; (c) 2007 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; ANNIHILATION; ASYMMETRY; B PLUS MESONS; BRANCHING RATIO; CP INVARIANCE; DECAY AMPLITUDES; KAONS NEUTRAL; KAONS PLUS; PIONS PLUS

Citation Formats

Hao Xiqing, Li Xueqian, He Xiaogang, and Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei. Annihilation contributions and CP asymmetries in B{sup +}{yields}{pi}{sup +}K{sup 0}, K{sup +}K{sup 0} and B{sup 0}{yields}K{sup 0}K{sup 0}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.037501.
Hao Xiqing, Li Xueqian, He Xiaogang, & Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei. Annihilation contributions and CP asymmetries in B{sup +}{yields}{pi}{sup +}K{sup 0}, K{sup +}K{sup 0} and B{sup 0}{yields}K{sup 0}K{sup 0}. United States. doi:10.1103/PHYSREVD.75.037501.
Hao Xiqing, Li Xueqian, He Xiaogang, and Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei. Thu . "Annihilation contributions and CP asymmetries in B{sup +}{yields}{pi}{sup +}K{sup 0}, K{sup +}K{sup 0} and B{sup 0}{yields}K{sup 0}K{sup 0}". United States. doi:10.1103/PHYSREVD.75.037501.
@article{osti_21011024,
title = {Annihilation contributions and CP asymmetries in B{sup +}{yields}{pi}{sup +}K{sup 0}, K{sup +}K{sup 0} and B{sup 0}{yields}K{sup 0}K{sup 0}},
author = {Hao Xiqing and Li Xueqian and He Xiaogang and Department of Physics and Center for Theoretical Sciences, National Taiwan University, Taipei},
abstractNote = {Recently the branching ratios for B{sup +}{yields}K{sup +}K{sup 0} and B{sup 0}{yields}K{sup 0}K{sup 0} have been measured. Data indicate that the annihilation amplitudes in these decays are not zero. A nonzero annihilation amplitude plays an important role in CP violation for B{sup +}{yields}{pi}{sup +}K{sup 0}, K{sup +}K{sup 0}. Using the measured branching ratios for these decays, we show that there is an absolute bound of 5% for the size of CP asymmetry in B{sup +}{yields}{pi}{sup +}K{sup 0} from a relation between the amplitudes of these decays. The size of CP asymmetry in B{sup +}{yields}K{sup +}K{sup 0} can, however, be as large as 90%. Future experimental data will test these predictions.},
doi = {10.1103/PHYSREVD.75.037501},
journal = {Physical Review. D, Particles Fields},
number = 3,
volume = 75,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 2007},
month = {Thu Feb 01 00:00:00 EST 2007}
}
  • Based on a sample of 227x10{sup 6} BB pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B{sup 0}{yields}{pi}{sup 0}{pi}{sup 0})=(1.17{+-}0.32{+-}0.10)x10{sup -6}, and the asymmetry C{sub {pi}}{sub {sup 0}}{sub {pi}}{sub {sup 0}}=-0.12{+-}0.56{+-}0.06. The B{sup 0}{yields}{pi}{sup 0}{pi}{sup 0} signal has a significance of 5.0{sigma}. We also measure B(B{sup +}{yields}{pi}{sup +}{pi}{sup 0})=(5.8{+-}0.6{+-}0.4)x10{sup -6}, B(B{sup +}{yields}K{sup +}{pi}{sup 0})=(12.0{+-}0.7{+-}0.6)x10{sup -6}, and the charge asymmetries A{sub {pi}}{sub {sup +}}{sub {pi}}{sub {sup 0}}=-0.01{+-}0.10{+-}0.02 and A{sub K{sup +}}{sub {pi}}{sub {sup 0}}=0.06{+-}0.06{+-}0.01. Using isospin relations, we find an upper bound on the angle difference vertical bar {alpha}-{alpha}{sub eff}more » vertical bar of 35 deg. at the 90% C.L.« less
  • We present improved measurements of CP-violation parameters in B{sup 0}{yields}{phi}K{sup 0}, {eta}{sup '}K{sup 0}, K{sub S}{sup 0}K{sub S}{sup 0}K{sub S}{sup 0} decays based on a sample of 535x10{sup 6} BB pairs collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB energy-asymmetric e{sup +}e{sup -} collider. We obtain sin2{phi}{sub 1}{sup eff}=+0.64{+-}0.10(stat){+-}0.04(syst) for B{sup 0}{yields}{eta}{sup '}K{sup 0}, +0.50{+-}0.21(stat){+-}0.06(syst) for B{sup 0}{yields}{phi}K{sup 0}, and +0.30{+-}0.32(stat){+-}0.08(syst) for B{sup 0}{yields}K{sub S}{sup 0}K{sub S}{sup 0}K{sub S}{sup 0} decays. We have observed CP violation in the B{sup 0}{yields}{eta}{sup '}K{sup 0} decay with a significance of 5.6 standard deviations. We also perform an improved measurementmore » of CP asymmetries in B{sup 0}{yields}J/{psi}K{sup 0} decays and obtain sin2{phi}{sub 1}=+0.642{+-}0.031(stat){+-}0.017(syst)« less
  • We present a measurement of the time-dependent CP-violating asymmetries in B{sup 0}{yields}K{sub S}{sup 0}{pi}{sup 0} decays based on 383x10{sup 6} {upsilon}(4S){yields}BB events collected by the BABAR experiment at the PEP-II asymmetric-energy B Factory at the Stanford Linear Accelerator Center. We measure the direct CP-violating asymmetry C{sub K{sub S}{sup 0}}{sub {pi}{sup 0}}=0.24{+-}0.15{+-}0.03 and the CP-violating asymmetry in the interference between mixing and decay S{sub K{sub S}{sup 0}}{sub {pi}{sup 0}}=0.40{+-}0.23{+-}0.03, where the first errors are statistical and the second are systematic. On the same sample, we measure the decay branching fraction, obtaining B(B{sup 0}{yields}K{sup 0}{pi}{sup 0})=(10.3{+-}0.7{+-}0.6)x10{sup -6}.
  • We report an analysis of charmless hadronic decays of charged B mesons to the final state K{sup +}{pi}{sup 0}{pi}{sup 0}, using a data sample of (470.9{+-}2.8)x10{sup 6} BB events collected with the BABAR detector at the {Upsilon}(4S) resonance. We observe an excess of signal events, with a significance above 10 standard deviations including systematic uncertainties, and measure the branching fraction and CP asymmetry to be B(B{sup +}{yields}K{sup +}{pi}{sup 0}{pi}{sup 0})=(16.2{+-}1.2{+-}1.5)x10{sup -6} and A{sub CP}(B{sup +}{yields}K{sup +}{pi}{sup 0}{pi}{sup 0})=-0.06{+-}0.06{+-}0.04, where the uncertainties are statistical and systematic, respectively. Additionally, we study the contributions of the B{sup +}{yields}K{sup *}(892){sup +}{pi}{sup 0}, B{sup +}{yields}f{submore » 0}(980)K{sup +}, and B{sup +}{yields}{chi}{sub c0}K{sup +} quasi-two-body decays. We report the world's best measurements of the branching fraction and CP asymmetry of the B{sup +}{yields}K{sup +}{pi}{sup 0}{pi}{sup 0} and B{sup +}{yields}K{sup *}(892){sup +}{pi}{sup 0} channels.« less
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