The Measurement of CP Asymmetries And Branching Fractions in Neutral B Meson Decays to Charged Rhos And Pions (Kaons) With the BaBar Detector

Liu, Ran

Stanford Linear Accelerator Center

关键词: Maximum-Likelihood Fit;    B Mesons;    Luminosity;    Hepex;    Time Dependence Hepex;   

DOI  :  10.2172/878443
RP-ID  :  SLAC-R-779
RP-ID  :  AC02-76SF00515
RP-ID  :  878443

美国|英语

来源: UNT Digital Library

【 摘 要 】

The authors present measurements of branching ratios and CP-violating asymmetries for neutral B decays into quasi two-body 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 1999-2002 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 off-peak. From a time-dependent 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)) x 10{sup -6}. For the CP violation parameters, they measure: {Alpha}{sub CP}{sup pK} = 0.28 {+-} 0.17(stat) {+-} 0.080(syst), {Alpha}{sub CP}{sup pk} = -0.18 {+-} 0.08(stat) {+-} 0.029(syst), C{sub pk} = 0.36 {+-} 0.18(stat) {+-} 0.041(syst), S{sub pt} = 0.19 {+-} 0.24(stat) {+-} 0.031(syst), and for the remaining parameters, required to fully describe the time dependence of the B{sup 0}({bar B}{sup 0} {yields} {rho}{sup {+-}}{pi}{sup {-+}}) decays, they obtain {Delta}C{sub pn} = 0.28{sub -0.19}{sup +0.18}(stat) {+-} 0.043(syst), {Delta}S{sub pk} = 0.15 {+-} 0.25(stat) {+-} 0.025(syst).