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Title: Branching ratio and CP asymmetry of B{sub s}{yields}{pi}{sup 0}{eta}{sup (')} decays in the perturbative QCD approach

Abstract

We calculate the branching ratios and CP-violating asymmetries for B{sub s}{sup 0}{yields}{pi}{sup 0}{eta}{sup (')} decays in the perturbative QCD (pQCD) factorization approach here. We not only calculate the usual factorizable contributions, but also evaluate the nonfactorizable and annihilation type contributions. The pQCD predictions for the CP-averaged branching ratios are BR(B{sub s}{sup 0}{yields}{pi}{sup 0}{eta}){approx_equal}0.86x10{sup -7} and BR(B{sub s}{sup 0}{yields}{pi}{sup 0}{eta}{sup '}){approx_equal}1.86x10{sup -7}. The pQCD predictions for the CP-violating asymmetries are A{sub CP}{sup dir}({pi}{sup 0}{eta}){approx}-4.5%, A{sub CP}{sup dir}({pi}{sup 0}{eta}{sup '}){approx}-9.1%, A{sub CP}{sup mix}({pi}{sup 0}{eta}){approx}-0.2%, and A{sub CP}{sup mix}({pi}{sup 0}{eta}{sup '}){approx}27% but with large errors. The above pQCD predictions can be tested in the forthcoming LHC-b experiments at CERN.

Authors:
;  [1];  [1];  [2]
  1. Department of Physics and Institute of Theoretical Physics, Nanjing Normal University, Nanjing, Jiangsu 210097 (China)
  2. (China)
Publication Date:
OSTI Identifier:
21010993
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.75.034017; (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 S MESONS; BRANCHING RATIO; CERN LHC; CP INVARIANCE; ERRORS; ETA MESONS; ETA PRIME-958 MESONS; FACTORIZATION; PARTICLE DECAY; PERTURBATION THEORY; PIONS NEUTRAL; QUANTUM CHROMODYNAMICS

Citation Formats

Xiao Zhenjun, Wang Huisheng, Liu Xin, and Department of Physics, Zhejiang Ocean University, Zhoushan, Zhejiang 316004. Branching ratio and CP asymmetry of B{sub s}{yields}{pi}{sup 0}{eta}{sup (')} decays in the perturbative QCD approach. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.034017.
Xiao Zhenjun, Wang Huisheng, Liu Xin, & Department of Physics, Zhejiang Ocean University, Zhoushan, Zhejiang 316004. Branching ratio and CP asymmetry of B{sub s}{yields}{pi}{sup 0}{eta}{sup (')} decays in the perturbative QCD approach. United States. doi:10.1103/PHYSREVD.75.034017.
Xiao Zhenjun, Wang Huisheng, Liu Xin, and Department of Physics, Zhejiang Ocean University, Zhoushan, Zhejiang 316004. Thu . "Branching ratio and CP asymmetry of B{sub s}{yields}{pi}{sup 0}{eta}{sup (')} decays in the perturbative QCD approach". United States. doi:10.1103/PHYSREVD.75.034017.
@article{osti_21010993,
title = {Branching ratio and CP asymmetry of B{sub s}{yields}{pi}{sup 0}{eta}{sup (')} decays in the perturbative QCD approach},
author = {Xiao Zhenjun and Wang Huisheng and Liu Xin and Department of Physics, Zhejiang Ocean University, Zhoushan, Zhejiang 316004},
abstractNote = {We calculate the branching ratios and CP-violating asymmetries for B{sub s}{sup 0}{yields}{pi}{sup 0}{eta}{sup (')} decays in the perturbative QCD (pQCD) factorization approach here. We not only calculate the usual factorizable contributions, but also evaluate the nonfactorizable and annihilation type contributions. The pQCD predictions for the CP-averaged branching ratios are BR(B{sub s}{sup 0}{yields}{pi}{sup 0}{eta}){approx_equal}0.86x10{sup -7} and BR(B{sub s}{sup 0}{yields}{pi}{sup 0}{eta}{sup '}){approx_equal}1.86x10{sup -7}. The pQCD predictions for the CP-violating asymmetries are A{sub CP}{sup dir}({pi}{sup 0}{eta}){approx}-4.5%, A{sub CP}{sup dir}({pi}{sup 0}{eta}{sup '}){approx}-9.1%, A{sub CP}{sup mix}({pi}{sup 0}{eta}){approx}-0.2%, and A{sub CP}{sup mix}({pi}{sup 0}{eta}{sup '}){approx}27% but with large errors. The above pQCD predictions can be tested in the forthcoming LHC-b experiments at CERN.},
doi = {10.1103/PHYSREVD.75.034017},
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}
}
  • We calculate the CP-averaged branching ratios and CP-violating asymmetries for B{sup 0}{yields}{eta}{eta}, {eta}{eta}{sup '} and {eta}{sup '}{eta}{sup '} decays by employing the perturbative QCD (pQCD) factorization approach. The pQCD predictions for the CP-averaged branching ratios are Br(B{sup 0}{yields}{eta}{eta}){approx_equal}0.67x10{sup -7}, Br(B{sup 0}{yields}{eta}{eta}{sup '}){approx_equal}0.18x10{sup -7}, and Br(B{sup 0}{yields}{eta}{sup '}{eta}{sup '}){approx_equal}0.11x10{sup -7}, which are consistent with currently available experimental upper limits. We also predict large CP-violating asymmetries for the considered three decay modes, which can be tested by the future B meson experiments.
  • In this paper, we calculate the branching ratios and CP-violating asymmetries for B{sup 0}{yields}{rho}{sup 0}{eta}{sup (')} and B{sup +}{yields}{rho}{sup +}{eta}{sup (')} decays in the perturbative QCD factorization approach. In this approach, we not only calculate the usual factorizable contributions, but also evaluate the nonfactorizable and annihilation type contributions. Besides the current-current operators, the contributions from the QCD and electroweak penguin operators are also taken into account. The theoretical predictions for the branching ratios are Br(B{sup +}{yields}{rho}{sup +}{eta}{sup (')}){approx_equal}9x10{sup -6} and Br(B{sup 0}{yields}{rho}{sup 0}{eta}{sup (')}){approx_equal}5x10{sup -8}, which agree well with the measured values and currently available experimental upper limits. We alsomore » predict large CP-violating asymmetries in these decays: A{sub CP}{sup dir}({rho}{sup {+-}}{eta}){approx_equal}-13%, A{sub CP}{sup dir}({rho}{sup {+-}}{eta}{sup '}){approx_equal}-18%, A{sub CP}{sup dir}({rho}{sup 0}{eta}){approx_equal}-41%, A{sub CP}{sup dir}({rho}{sup 0}{eta}{sup '}){approx_equal}-27%, A{sub CP}{sup mix}({rho}{sup 0}{eta}){approx_equal}+25%, and A{sub CP}{sup mix}({rho}{sup 0}{eta}{sup '}){approx_equal}+11%, which can be tested by the current or future B factory experiments.« less
  • In the framework of perturbative QCD approach, we calculate the branching ratio and CP asymmetry for B{sub s}{sup 0}(B{sub s}){yields}{pi}{sup {+-}}K{sup {+-}} and B{sub s}(B{sub s}){yields}{pi}{sup 0}K{sup 0}(K{sup 0}) decays. Besides the usual factorizable diagrams, both nonfactorizable and annihilation type contributions are taken into account. We find that (a) the branching ratio of B{sub s}{sup 0}(B{sub s}){yields}{pi}{sup {+-}}K{sup {+-}} is about (6-10)x10{sup -6}; Br(B{sub s}(B{sub s}){yields}{pi}{sup 0}K{sup 0}(K{sup 0})) about (1-3)x10{sup -7}; and (b) there are large CP asymmetries in the two processes, which can be tested in the near future LHC-b experiments at CERN and BTeV experiments at Fermilab.
  • No abstract prepared.
  • We study the decays B{sup -}{yields}D{sup 0}{pi}{sup -} and B{sup -}{yields}D{sup 0}K{sup -}, where the D{sup 0} decays into D{sup 0}{pi}{sup 0}, with the D{sup 0} reconstructed in the CP-even (CP+) eigenstates K{sup -}K{sup +} and {pi}{sup -}{pi}{sup +} and in the (non-CP) channels K{sup -}{pi}{sup +}, K{sup -}{pi}{sup +}{pi}{sup +}{pi}{sup -}, and K{sup -}{pi}{sup +}{pi}{sup 0}. Using a sample of about 123x10{sup 6} BB pairs, we measure the ratios of decay rates R{sub non-CP}{sup {identical_to}}(B(B{sup -}{yields}D{sub non-CP}{sup 0}K{sup -})/B(B{sup -}{yields}D{sub non-CP}{sup 0}{pi}{sup -}))=0.0813{+-}= 0.0040(stat){sub -0.0031} {sup +0.0042}(syst), and provide the first measurements of R{sub CP+}{sup {identical_to}}(B(B{sup -}{yields}D{sub CP+}{sup 0}K{supmore » -})/B(B{sup -}{yields}D{sub CP+}{sup 0}{pi}{sup -}))=0.086{+-}0.021(stat){+-}0.007(syst), and of the CP asymmetry A{sub CP+}{sup {identical_to}}(B(B{sup -}{yields}D{sub CP+}{sup 0}K{sup -})-B(B{sup +}{yields}D{sub CP+}{sup 0}K{sup +})/B(B{sup -}{yields}D{sub CP+}{sup 0}K{sup -})+B(= B{sup +}{yields}D{sub CP+}{sup 0}K{sup +}))=-0.10{+-}0.23 (stat){sub -0.04}{sup +0.03}(syst)« less