Study of Branching Fractions and CPViolating Asymmetries in B Meson Decays to Rho And Pion Final State with the BABAR Detector
Abstract
We present measurements of branching fractions and CPviolating asymmetries in Bmeson decays to {rho}{sup +}{pi}{sup 0}, {rho}{sup 0}{pi}{sup +} and {rho}{sup 0}{pi}{sup 0}. The data sample comprises 89 x 10{sup 6} {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEPII asymmetricenergy B Factory at SLAC. We find the chargeaveraged branching fractions {Beta}(B{sup +} {yields} {rho}{sup +}{pi}{sup 0}) = (10.9 {+} 1.9(stat) {+} 1.9(syst)) x 10{sup 6} and {Beta}(B{sup 0} {yields} {rho}{sup 0}{pi}{sup +}) = (9.5 {+} 1.1 {+} 0.9) x 10{sup 6}, and we set a 90% confidencelevel upper limit {Beta}(B{sup 0} {yields} {rho}{sup 0}{pi}{sup 0}) < 2.9 x 10{sup 6}. We measure the charge asymmetries A{sub CP}{rho}{sup +}{pi}{sup 0} = 0.24 {+} 0.16 {+} 0.06 and {Alpha}{sub CP}{sup {rho}{sup 0}{pi}{sup +}} = 0.19 {+} 0.11 {+} 0.02. We also present the preliminary measurement of CPviolating asymmetries in B{sup 0} {yields} ({rho}{pi}){sup 0} {yields} {pi}{sup +}{pi}{sup }{pi}{sup 0} decays using a timedependent Dalitz plot analysis. The results are obtained from a data sample of 213 million {Upsilon}(4S) {yields} B{bar B} decays, collected by the BABAR detector at the PEPII asymmetricenergy B Factory at SLAC. This analysis extends the narrow{rho} quasitwobody approximation used in the previous analysis,more »
 Authors:
 Publication Date:
 Research Org.:
 Stanford Linear Accelerator Center (SLAC)
 Sponsoring Org.:
 USDOE
 OSTI Identifier:
 877968
 Report Number(s):
 SLACR811
TRN: US200611%%153
 DOE Contract Number:
 AC0276SF00515
 Resource Type:
 Technical Report
 Country of Publication:
 United States
 Language:
 English
 Subject:
 43 PARTICLE ACCELERATORS; B MESONS; DALITZ PLOT; DECAY; DILUTION; FORM FACTORS; MAXIMUMLIKELIHOOD FIT; MESONS; PHASE SHIFT; PIONS; STANFORD LINEAR ACCELERATOR CENTER; UNITARITY; ExperimentHEP,HEPEX
Citation Formats
Wu, Jinwei, and /Wisconsin U., Madison. Study of Branching Fractions and CPViolating Asymmetries in B Meson Decays to Rho And Pion Final State with the BABAR Detector. United States: N. p., 2006.
Web. doi:10.2172/877968.
Wu, Jinwei, & /Wisconsin U., Madison. Study of Branching Fractions and CPViolating Asymmetries in B Meson Decays to Rho And Pion Final State with the BABAR Detector. United States. doi:10.2172/877968.
Wu, Jinwei, and /Wisconsin U., Madison. Wed .
"Study of Branching Fractions and CPViolating Asymmetries in B Meson Decays to Rho And Pion Final State with the BABAR Detector". United States.
doi:10.2172/877968. https://www.osti.gov/servlets/purl/877968.
@article{osti_877968,
title = {Study of Branching Fractions and CPViolating Asymmetries in B Meson Decays to Rho And Pion Final State with the BABAR Detector},
author = {Wu, Jinwei and /Wisconsin U., Madison},
abstractNote = {We present measurements of branching fractions and CPviolating asymmetries in Bmeson decays to {rho}{sup +}{pi}{sup 0}, {rho}{sup 0}{pi}{sup +} and {rho}{sup 0}{pi}{sup 0}. The data sample comprises 89 x 10{sup 6} {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEPII asymmetricenergy B Factory at SLAC. We find the chargeaveraged branching fractions {Beta}(B{sup +} {yields} {rho}{sup +}{pi}{sup 0}) = (10.9 {+} 1.9(stat) {+} 1.9(syst)) x 10{sup 6} and {Beta}(B{sup 0} {yields} {rho}{sup 0}{pi}{sup +}) = (9.5 {+} 1.1 {+} 0.9) x 10{sup 6}, and we set a 90% confidencelevel upper limit {Beta}(B{sup 0} {yields} {rho}{sup 0}{pi}{sup 0}) < 2.9 x 10{sup 6}. We measure the charge asymmetries A{sub CP}{rho}{sup +}{pi}{sup 0} = 0.24 {+} 0.16 {+} 0.06 and {Alpha}{sub CP}{sup {rho}{sup 0}{pi}{sup +}} = 0.19 {+} 0.11 {+} 0.02. We also present the preliminary measurement of CPviolating asymmetries in B{sup 0} {yields} ({rho}{pi}){sup 0} {yields} {pi}{sup +}{pi}{sup }{pi}{sup 0} decays using a timedependent Dalitz plot analysis. The results are obtained from a data sample of 213 million {Upsilon}(4S) {yields} B{bar B} decays, collected by the BABAR detector at the PEPII asymmetricenergy B Factory at SLAC. This analysis extends the narrow{rho} quasitwobody approximation used in the previous analysis, by taking into account the interference between the {rho} resonances of the three charges. We measure 16 coefficients of the bilinear form factor terms occurring in the timedependent decay rate of the B{sup 0} meson with the use of a maximumlikelihood fit. We derive the physically relevant quantities from these coefficients. We measure the direct CPviolation parameters {Alpha}{sub {rho}{pi}} = 0.088 {+} 0.049 {+} 0.013 and C = 0.34 {+} 0.11 {+} 0.05, where the first errors are statistical and the second systematic. For the mixinginduced CPviolation parameter we find S = 0.10 {+} 0.14 {+} 0.04, and for the dilution and strong phase shift parameters respectively, we obtain {Delta}C = 0.15 {+} 0.11 {+} 0.03 and {Delta}S = 0.22 {+} 0.15 {+} 0.03. For the angle {alpha} of the Unitarity Triangle we measure (113{sub 17}{sup +27} {+} 6){sup o}; only a weak constraint is achieved at the significance level of more than two standard deviations. Finally, for the relative strong phase {delta}{sub +} between the B{sup 0} {yields} {rho}{sup }{pi}{sup +} and B{sup 0} {yields} {rho}{sup +}{pi}{sup } transitions we find (67{sub 31}{sup +28} {+} 7){sup o}, with a similarly weak constraint at two standard deviations and beyond.},
doi = {10.2172/877968},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Mar 22 00:00:00 EST 2006},
month = {Wed Mar 22 00:00:00 EST 2006}
}

This dissertation describes the measurement of branching fractions and CP asymmetries in neutral B meson decays to charmless twobody final states of charged pions and kaons. CP violation is a poorlyconstrained phenomenon in the Standard model (SM) of particle physics and had been studied only in the kaon system before the Babar and Belle experiments. The decay of the neutral B meson to charged pions and kaons is particularly useful for the study of CP violation because they can be related to the Unitarity Triangle angle {alpha}.

Measurement of CP Asymmetries and Branching Fractions in Neutral B Meson Decays to Charged Pions and Kaons with the BABAR Detector
This dissertation presents a measurement of CP asymmetries and branching fractions for neutral B meson decays to twobody final states of charged pions and kaons. The results are obtained from a data sample of about 88 million {Upsilon}(4S) {yields} B{bar B} decays collected between 1999 and 2002 with the BABAR detector at the PEPII asymmetricenergy B factory located at the Stanford Linear Accelerator Center. A fit to kinematic, topological, and particle identification information measures the chargeaveraged branching fractions {Beta}(B{sup 0} {yields} {pi}{sup +}{pi}{sup }) = (4.7 {+} 0.6 {+} 0.2) x 10{sup 6} and {Beta}(B{sup 0} {yields} K{sup +}{pi}{sup })more » 
The Measurement of CP Asymmetries And Branching Fractions in Neutral B Meson Decays to Charged Rhos And Pions (Kaons) With the BaBar Detector
The authors present measurements of branching ratios and CPviolating asymmetries for neutral B decays into quasi twobody final states dominated by the modes {rho}{sup {+}}{pi}{sup {+}} and {rho}{sup {+}}K{sup {+}}. The data set used for these measurements was recorded during the 19992002 period, and corresponds to a total integrated luminosity of 81.9 fb{sup 1} taken on the {Upsilon}(4S) peak, and 9.5 fb{sup 1} taken 40 MeV offpeak. From a timedependent maximum likelihood fit they find for the branching fractions {Beta}({rho}{sup 2}{pi}{sup {+}}) = (22.6 {+} 1.8(stat) {+} 2.2(syst)) x 10{sup 6}, {Beta}({rho}{sup {+}}K{sup {+}}) = (7.3{sub 1.2}{sup +1.3}(stat) {+} 1.3(syst))more » 
Measurement of Branching Fractions and CPviolating Charge Asymmetries in B{sup +} {yields} {rho}{sup +}{pi}{sup 0} and B{sup +} {yields} {rho}{sup 0}{pi}{sup +} decays, and search for B{sup 0} {yields} {rho}{sup 0}{pi}{sup 0}
The authors present preliminary measurements of branching fractions and CPviolating charge asymmetries in Bmeson decays to {rho}{pi}. The data sample comprises 89 million {Upsilon}(4S) {yields} B{bar B} decays collected with the BABAR detector at the PEPII asymmetricenergy B Factor at SLAC. They find the chargeaveraged branching fractions {Beta}(B{sup +} {yields} {rho}{sup +}{pi}{sup 0}) = (11.0 {+} 1.9(stat.) {+} 1.9(syst.)) x 10{sup 6} and {Beta}(B{sup +} {yields} {rho}{sup 0}{pi}{sup +}) = (9.3 {+} 1.0(stat.) {+} 0.8(syst.)) x 10{sup 6}; they set a 90% confidencelevel upper limit of {Beta}(B{sup 0} {yields} {rho}{sup 0}{pi}{sup 0}) < 2.5 x 10{sup 6}. They measure themore » 
Measurement of the Branching Fractions and CP Asymmetries of B{sup } > D{sup 0}{sub (CP)}K{sup } Decays with the BABAR Detector
The authors have reconstructed B{sup } > D{sup 0}K{sup } decays with D{sup 0} mesons decaying to nonCP (K{sup }{pi}{sup +}), CDeven (K{sup }K{sup +}, {pi}{sup }{pi}{sup +}) and CPodd (K{sup 0}{sub s}{pi}{sup 0}) eigenstates. They have measured the CP asymmetries A{sub CP{sup +}} = 0.40 {+} 0.15(stat) {+} 0.08(syst), A{sup CP{sup }} = 0.21 {+} 0.17(stat) {+} 0.07(syst), and the double ratio of branching fractions R{sub +} = 0.87 {+} 0.14(stat) {+} 0.06(syst), R{sub } = 0.80 {+} 0.14(stat) {+} 0.08(syst). These results improve the previous existing measurements from BABAR. All results presented in this document are preliminary.