Measurement of sin2beta with Hadronic and Previously Unused Muonic J/psi Decays

Details Measurement of sin2beta with Hadronic and Previously Unused Muonic J/psi Decays Measurement of sin2beta with Hadronic and Previously Unused Muonic J/psi Decays

2003-09-10

arxiv.org/abs/hep-ex/0309039v2

Phys.Rev.D69:052001,2004

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, three figures, submitted to Physical Review D

Scientific paper

10.1103/PhysRevD.69.052001

We report a measurement of the CP-violation parameter sin2beta with B^0 -> J/psi K^0_S decays in which the J/psi decays to hadrons or to muons that do not satisfy our standard identification criteria. With a sample of 88 million BBbar events collected by the BaBar detector at the PEP-II asymmetric-energy $B$ factory at SLAC, we reconstruct 100 +/- 17 such events, with J/psi -> pi^+ pi^- pi^0 being the most prevalent, and measure sin2beta = 1.56 +/- 0.42 (stat.) +/- 0.21 (syst.).

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