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Title: Measurement of the B+- to rho pi0 Branching Fraction and Direct CP Asymmetry

Abstract

The authors present improved measurements of the branching fraction and CP asymmetry for the process B{sup {+-}} {yields} {rho}{sup {+-}}{pi}{sup 0}. The data sample corresponding to 211 fb{sup -1} comprises 232 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. The yield and CP asymmetry are measured using an extended maximum likelihood fitting method. The branching fraction and Cp asymmetry are found to be {Beta}(B{sup {+-}} {yields} {rho}{sup {+-}}{pi}{sup 0}) = [10.2 {+-} 1.4(stat) {+-} 0.9(syst)] x 10{sup -6} and {Alpha}{sub CP}(B{sup {+-}} {yields} {rho}{sup {+-}}{pi}{sup 0}) = -0.01 {+-} 0.13(stat) {+-} 0.02(syst).

Authors:
Publication Date:
Research Org.:
Stanford Linear Accelerator Center (SLAC)
Sponsoring Org.:
USDOE
OSTI Identifier:
897730
Report Number(s):
SLAC-PUB-12285
hep-ex/0701035; TRN: US0701505
DOE Contract Number:
AC02-76SF00515
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review D - Rapid Communications
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; ASYMMETRY; STANFORD LINEAR ACCELERATOR CENTER; PHYSICS; Experiment-HEP,HEPEX

Citation Formats

Aubert, B. Measurement of the B+- to rho pi0 Branching Fraction and Direct CP Asymmetry. United States: N. p., 2007. Web. doi:10.1103/PhysRevD.76.011103.
Aubert, B. Measurement of the B+- to rho pi0 Branching Fraction and Direct CP Asymmetry. United States. doi:10.1103/PhysRevD.76.011103.
Aubert, B. Thu . "Measurement of the B+- to rho pi0 Branching Fraction and Direct CP Asymmetry". United States. doi:10.1103/PhysRevD.76.011103. https://www.osti.gov/servlets/purl/897730.
@article{osti_897730,
title = {Measurement of the B+- to rho pi0 Branching Fraction and Direct CP Asymmetry},
author = {Aubert, B.},
abstractNote = {The authors present improved measurements of the branching fraction and CP asymmetry for the process B{sup {+-}} {yields} {rho}{sup {+-}}{pi}{sup 0}. The data sample corresponding to 211 fb{sup -1} comprises 232 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. The yield and CP asymmetry are measured using an extended maximum likelihood fitting method. The branching fraction and Cp asymmetry are found to be {Beta}(B{sup {+-}} {yields} {rho}{sup {+-}}{pi}{sup 0}) = [10.2 {+-} 1.4(stat) {+-} 0.9(syst)] x 10{sup -6} and {Alpha}{sub CP}(B{sup {+-}} {yields} {rho}{sup {+-}}{pi}{sup 0}) = -0.01 {+-} 0.13(stat) {+-} 0.02(syst).},
doi = {10.1103/PhysRevD.76.011103},
journal = {Physical Review D - Rapid Communications},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 25 00:00:00 EST 2007},
month = {Thu Jan 25 00:00:00 EST 2007}
}
  • No abstract prepared.
  • An improved measurement of the process B{sup {+-}} {yields} {rho}{sup {+-}}{pi}{sup 0} is presented. The data sample of 211 fb{sup -1} comprises 232 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. The yield and CP asymmetry are calculated using an extended maximum likelihood fitting method. The branching fraction and asymmetry are found to be {Beta}(B{sup {+-}} {yields} {rho}{sup {+-}}{pi}{sup 0}) = [10.0 {+-} 1.4 (Stat.) {+-} 0.9 (Syst.)] x 10{sup -6} and {Alpha}{sub CP}(B{sup {+-}} {yields} {rho}{sup {+-}}{pi}{sup 0}) = -0.01 {+-} 0.13 (Stat.) {+-} 0.02 (Syst.), superseding previousmore » measurements. The statistical significance of the signal is calculated to be 8.7{sigma}.« less
  • We report a measurement of the branching fraction of the decay B{sup 0}{yields}{rho}{sup 0}{pi}{sup 0}, using 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 detect 51{sub -13}{sup +14} signal events with a significance of 4.2 standard deviations, including systematic uncertainties, and measure the branching fraction to be B(B{sup 0}{yields}{rho}{sup 0}{pi}{sup 0})=(3.12{sub -0.82}{sup +0.88}(stat){+-}0.33(syst){sub -0.6=} 8{sup +0.50}(model))x10{sup -6}. We also perform the first measurement of direct CP violating asymmetry in this mode.
  • We present improved measurements of the branching fraction and CP asymmetry for the process B{sup {+-}}{yields}{rho}{sup {+-}}{pi}{sup 0}. The data sample corresponding to 211 fb{sup -1} comprises 232x10{sup 6} {upsilon}(4S){yields}BB decays collected with the BABAR detector at the PEP-II asymmetric B Factory at SLAC. The yield and CP asymmetry are measured using an extended maximum likelihood fitting method. The branching fraction and CP asymmetry are found to be B(B{sup {+-}}{yields}{rho}{sup {+-}}{pi}{sup 0})=[10.2{+-}1.4(stat){+-}0.9(syst)]x10{sup -6} and A{sub CP}(B{sup {+-}}{yields}{rho}{sup {+-}}{pi}{sup 0})=-0.01{+-}0.13(stat){+-}0.02(syst)
  • We have measured the branching fraction B, longitudinal polarization fraction f{sub L}, and CP asymmetry coefficients A and S for B{sup 0}{yields}{rho}{sup +}{rho}{sup -} decays with the Belle detector at the KEKB e{sup +}e{sup -} collider using 253 fb{sup -1} of data. We obtain B=[22.8{+-}3.8(stat){sub -2.6}{sup +2.3}(syst)]x10{sup -6}, f{sub L}=0.941{sub -0.040}{sup +0.034}(stat){+-}0.030(syst), A=0.00{+-}0.30(stat){+-}0.09(syst), and S=0.08{+-}0.41(stat){+-}0.09(syst). These values are used to constrain the Cabibbo-Kobayashi-Maskawa phase {phi}{sub 2}; the solution consistent with the standard model is {phi}{sub 2}=(88{+-}17) deg. or 59 deg. <{phi}{sub 2}<115 deg. at 90% C.L.