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Title: Direct CP Violation in B{sup {+-}}{yields}ppK{sup (*){+-}}

Abstract

We study the direct CP violation in B{sup {+-}}{yields}ppK{sup (*){+-}} decays in the standard model. We point out that these three-body baryonic B decays can be important tools for detecting the direct CP violation in the charged B system, in which there are no conclusive signatures yet. In particular, we show that the direct CP-violating asymmetry in B{sup {+-}}{yields}ppK*{sup {+-}} is around 22%, which supports the recent data by the BABAR Collaboration.

Authors:
;  [1];  [2];  [3]
  1. Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 300 (China)
  2. (Canada)
  3. Theory Group, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3 (Canada)
Publication Date:
OSTI Identifier:
20861574
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review Letters; Journal Volume: 98; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevLett.98.011801; (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; ASYMMETRY; B MINUS MESONS; B PLUS MESONS; CP INVARIANCE; KAONS MINUS; KAONS PLUS; PAIR PRODUCTION; PARTICLE DECAY; PROTONS; STANDARD MODEL; THREE-BODY PROBLEM

Citation Formats

Geng, C. Q., Hsiao, Y. K., Theory Group, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, and Ng, J. N.. Direct CP Violation in B{sup {+-}}{yields}ppK{sup (*){+-}}. United States: N. p., 2007. Web. doi:10.1103/PHYSREVLETT.98.011801.
Geng, C. Q., Hsiao, Y. K., Theory Group, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, & Ng, J. N.. Direct CP Violation in B{sup {+-}}{yields}ppK{sup (*){+-}}. United States. doi:10.1103/PHYSREVLETT.98.011801.
Geng, C. Q., Hsiao, Y. K., Theory Group, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, and Ng, J. N.. Fri . "Direct CP Violation in B{sup {+-}}{yields}ppK{sup (*){+-}}". United States. doi:10.1103/PHYSREVLETT.98.011801.
@article{osti_20861574,
title = {Direct CP Violation in B{sup {+-}}{yields}ppK{sup (*){+-}}},
author = {Geng, C. Q. and Hsiao, Y. K. and Theory Group, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3 and Ng, J. N.},
abstractNote = {We study the direct CP violation in B{sup {+-}}{yields}ppK{sup (*){+-}} decays in the standard model. We point out that these three-body baryonic B decays can be important tools for detecting the direct CP violation in the charged B system, in which there are no conclusive signatures yet. In particular, we show that the direct CP-violating asymmetry in B{sup {+-}}{yields}ppK*{sup {+-}} is around 22%, which supports the recent data by the BABAR Collaboration.},
doi = {10.1103/PHYSREVLETT.98.011801},
journal = {Physical Review Letters},
number = 1,
volume = 98,
place = {United States},
year = {Fri Jan 05 00:00:00 EST 2007},
month = {Fri Jan 05 00:00:00 EST 2007}
}
  • We present evidence for the b{yields}d penguin-dominated decays B{sup +}{yields}K{sup 0}K{sup +} and B{sup 0}{yields}K{sup 0}K{sup 0} in 227x10{sup 6} {upsilon}(4S){yields}BB decays collected with the BABAR detector. We measure the branching fractions B(B{sup +}{yields}K{sup 0}K{sup +})=(1.5{+-}0.5{+-}0.1)x10{sup -6}(<2.4x10{sup -6}) and B(B{sup 0}{yields}K{sup 0}K{sup 0})=(1.19{sub -0.35}{sup +0.40}{+-}0.13)x10{sup -6}, where the uncertainties are statistical and systematic, respectively. We also present improved measurements of the charge-averaged branching fraction B(B{sup +}{yields}K{sup 0}{pi}{sup +})=(26.0{+-}1.3{+-}1.0)x10{sup -6} and CP-violating charge asymmetry A{sub CP}(K{sup 0}{pi}{sup +})=-0.09{+-}0.05{+-}0.01, where the uncertainties are statistical and systematic, respectively.
  • We report results on a Dalitz analysis of three-body charmless B{sup {+-}}{yields}K{sup {+-}}{pi}{sup {+-}}{pi}{sup {+-}} decay including searches for direct CP violation. We report the first observation of the decay B{sup {+-}}{yields}f{sub 2}(1270)K{sup {+-}} with a statistical significance above 6{sigma}. We also observe first evidence for large direct CP violation in the B{sup {+-}}{yields}{rho}(770){sup 0}K{sup {+-}} channel. The results are obtained with a data sample that contains 386x10{sup 6} BB pairs collected at the {upsilon}(4S) resonance with the Belle detector at the KEKB asymmetric-energy e{sup +}e{sup -} collider.
  • We present measurements of the branching fractions, longitudinal polarization, and direct CP-violation asymmetries for the decays B{sup +}{yields}{rho}{sup 0}K*{sup +} and B{sup +}{yields}f{sub 0}(980)K*{sup +} with a sample of (467{+-}5)x10{sup 6}BB pairs collected with the BABAR detector at the PEP-II asymmetric-energy e{sup +}e{sup -} collider at the SLAC National Accelerator Laboratory. We observe B{sup +}{yields}{rho}{sup 0}K{sup *+} with a significance of 5.3{sigma} and measure the branching fraction B(B{sup +}{yields}{rho}{sup 0}K{sup *+})=(4.6{+-}1.0{+-}0.4)x10{sup -6}, the longitudinal polarization f{sub L}=0.78{+-}0.12{+-}0.03, and the CP-violation asymmetry A{sub CP}=0.31{+-}0.13{+-}0.03. We observe B{sup +}{yields}f{sub 0}(980)K*{sup +} and measure the branching fraction B(B{sup +}{yields}f{sub 0}(980)K*{sup +})xB(f{sub 0}(980){yields}{pi}{sup +}{pi}{supmore » -})=(4.2{+-}0.6{+-}0.3)x10{sup -6} and the CP-violation asymmetry A{sub CP}=-0.15{+-}0.12{+-}0.03. The first uncertainty quoted is statistical and the second is systematic.« less
  • We study the direct CP violation in B{sup 0}{yields}{rho}{sup 0}({omega}){rho}{sup 0}({omega}){yields}{pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -} [with unpolarized {rho}{sup 0}({omega})] via the {rho}-{omega} mixing mechanism which causes a large strong phase difference and consequently a large CP violating asymmetry when the masses of the {pi}{sup +}{pi}{sup -} pairs are in the vicinity of the {omega} resonance. Since there are two {rho}({omega}) mesons in the intermediate state {rho}-{omega} mixing contributes twice to the first order of isospin violation, leading to an even larger CP violating asymmetry (it could be 30%-50% larger) than in the case where only one {rho}({omega}) meson is involved.more » The CP violating asymmetry depends on the Cabibbo-Kobayashi-Maskawa (CKM) matrix elements and the hadronic matrix elements. The factorization approach is applied in the calculation of the hadronic matrix elements with the nonfactorizable effects being included effectively in an effective parameter, N{sub c}. We give the constraint on the range of N{sub c} from the latest experimental data for the branching ratios for B{sup 0}{yields}{rho}{sup 0}{rho}{sup 0} and B{sup 0}{yields}{rho}{sup +}{rho}{sup -}. We find that the CP violating asymmetry could be very large (even more than 90% for some values of N{sub c}). It is shown that the sensitivity of the CP violating asymmetry to N{sub c} is large compared with its smaller sensitivity to the CKM matrix elements. We also discuss the possibility to remove the mod ({pi}) ambiguity in the determination of the CP violating phase angle {alpha} through the measurement of the CP violating asymmetry in the decay B{sup 0}{yields}{rho}{sup 0}({omega}){rho}{sup 0}({omega}){yields}{pi}{sup +}{pi}{sup -}{pi}{sup +}{pi}{sup -}.« 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