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Title: A study of time-dependent CP-violating asymmetries in B0->J/psiK0S and B0->psi(2S)K0S decays

Abstract

We present a preliminary measurement of time-dependent CP-violating asymmetries in B{sup 0} {yields} J/{psi} K{sub S}{sup 0} and B{sup 0} {yields} {psi}(2S)K{sub S}{sup 0} decays recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The data sample consists of 9.0 fb{sup -1} collected at the {Upsilon}(4S) resonance and 0.8 fb{sup -1} off-resonance. One of the neutral B mesons, produced in pairs at the {Upsilon}(4S), is fully reconstructed. The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural network tagging algorithm is used to recover events without a clear lepton or kaon tag. The time difference between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities and the time resolution function are measured with samples of fully-reconstructed semileptonic and hadronic neutral B final states. The value of the asymmetry amplitude, sin2{beta}, is determined from a maximum likelihood fit to the time distribution of 120 tagged B{sup 0} {yields} J/{psi} K{sub S}{sup 0} and B{sup 0} {yields} {psi}(2S) K{sub S}{sup 0} candidates to be sin2{beta} = 0.12 {+-} 0.37(stat) {+-} 0.09(syst) (preliminary).

Authors:
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Energy Research (ER) (US)
OSTI Identifier:
784717
Report Number(s):
SLAC-PUB-8540
TRN: US0108538
DOE Contract Number:  
AC03-76SF00515
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 16 Oct 2000
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ALGORITHMS; ASYMMETRY; B NEUTRAL MESONS; PARTICLE DECAY; DISTRIBUTION; KAONS; LEPTONS; MAXIMUM-LIKELIHOOD FIT; NEURAL NETWORKS; RESONANCE; TIME RESOLUTION; CP INVARIANCE; VECTOR MESONS; PEP STORAGE RINGS; QUANTUM FLAVORDYNAMICS

Citation Formats

Barrera, Barbara. A study of time-dependent CP-violating asymmetries in B0->J/psiK0S and B0->psi(2S)K0S decays. United States: N. p., 2000. Web. doi:10.2172/784717.
Barrera, Barbara. A study of time-dependent CP-violating asymmetries in B0->J/psiK0S and B0->psi(2S)K0S decays. United States. https://doi.org/10.2172/784717
Barrera, Barbara. 2000. "A study of time-dependent CP-violating asymmetries in B0->J/psiK0S and B0->psi(2S)K0S decays". United States. https://doi.org/10.2172/784717. https://www.osti.gov/servlets/purl/784717.
@article{osti_784717,
title = {A study of time-dependent CP-violating asymmetries in B0->J/psiK0S and B0->psi(2S)K0S decays},
author = {Barrera, Barbara},
abstractNote = {We present a preliminary measurement of time-dependent CP-violating asymmetries in B{sup 0} {yields} J/{psi} K{sub S}{sup 0} and B{sup 0} {yields} {psi}(2S)K{sub S}{sup 0} decays recorded by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC. The data sample consists of 9.0 fb{sup -1} collected at the {Upsilon}(4S) resonance and 0.8 fb{sup -1} off-resonance. One of the neutral B mesons, produced in pairs at the {Upsilon}(4S), is fully reconstructed. The flavor of the other neutral B meson is tagged at the time of its decay, mainly with the charge of identified leptons and kaons. A neural network tagging algorithm is used to recover events without a clear lepton or kaon tag. The time difference between the decays is determined by measuring the distance between the decay vertices. Wrong-tag probabilities and the time resolution function are measured with samples of fully-reconstructed semileptonic and hadronic neutral B final states. The value of the asymmetry amplitude, sin2{beta}, is determined from a maximum likelihood fit to the time distribution of 120 tagged B{sup 0} {yields} J/{psi} K{sub S}{sup 0} and B{sup 0} {yields} {psi}(2S) K{sub S}{sup 0} candidates to be sin2{beta} = 0.12 {+-} 0.37(stat) {+-} 0.09(syst) (preliminary).},
doi = {10.2172/784717},
url = {https://www.osti.gov/biblio/784717}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Oct 16 00:00:00 EDT 2000},
month = {Mon Oct 16 00:00:00 EDT 2000}
}