Study of Inclusive $B^-$ and $\bar{B}^0$ Decays toFlavor-Tagged $D$, $D_s$ and $\Lambda_c$

Aubert, B.

Stanford Linear Accelerator Center

关键词: Decay;    Resonance Hepex;    Hepex;    Mesons;    72 Physics Of Elementary Particles And Fields;   

DOI  :  10.2172/883704
RP-ID  :  SLAC-PUB-11898
RP-ID  :  AC02-76SF00515
RP-ID  :  883704

美国|英语

来源: UNT Digital Library

【 摘 要 】

We report on a study of inclusive B{sup -} and {bar B}{sup 0} meson decays to D{sup 0}X, {bar D}{sup 0}X, D{sup +}X, D{sup -}X, D{sub s}{sup +}X, D{sub s}{sup -}X, {Lambda}{sub c}{sup +}X, {bar {Lambda}}{sub c}{sup -}X, based on a sample of 231 million B{bar B} events recorded with the BABAR detector at the {Upsilon}(4S) resonance. Events are selected by completely reconstructing one B and searching for a reconstructed charm particle in the rest of the event. From the measured branching fractions of these decays, we infer the number of charm and anti-charm particles per {bar B} decay, separately for charged and neutral parents. We derive the total charm yield per B{sup -} decay, n{sub c}{sup -} = 1.202 {+-} 0.023 {+-} 0.040{sub -0.029}{sup +0.035}, and per {bar B}{sup 0} decay, n = 1.193 {+-} 0.030 {+-} 0.034{sub -0.035}{sup +0.044} where the first uncertainty is statistical, the second is systematic, and the third reflects the charm branching-fraction uncertainties. We also present the charm momentum distributions measured in the {bar B} rest frame.