0000000000072638

AUTHOR

A. Hücker

showing 2 related works from this author

Measurements of the Mass and Width of theηcMeson and of anηc(2S)Candidate

2004

The mass m(eta(c)) and total width Gamma(eta(c))(tot) of the eta(c) meson have been measured in two-photon interactions at the SLAC e(+)e(-) asymmetric B Factory with the BABAR detector. With a sample of approximately 2500 reconstructed eta(c)-->K(0)(S)K+/-pi(-/+) decays in 88 fb(-1) of data, the results are m(eta(c))=2982.5+/-1.1(stat)+/-0.9(syst) MeV/c(2) and Gamma(eta(c))(tot)=34.3+/-2.3(stat)+/-0.9(syst) MeV/c(2). Using the same decay mode, a second resonance with 112+/-24 events is observed with a mass of 3630.8+/-3.4(stat)+/-1.0(syst) MeV/c(2) and width of 17.0+/-8.3(stat)+/-2.5(syst) MeV/c(2). This observation is consistent with expectations for the eta(c)(2S) state.

Quantum chromodynamicsPhysicsMeson010308 nuclear & particles physicsAnalytical chemistryGeneral Physics and AstronomyResonance01 natural sciencesB-factoryNuclear physics0103 physical sciencesHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsPhysical Review Letters
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Search for the decayB0→J/ψγ

2004

We present the results of a search for the radiative decay B0 --> J/psi gamma in a data set containing 123 million Y(4S)--> B B-bar decays, collected by the BABAR detector at the PEP-II asymmetric-energy e+e- storage ring at SLAC. We find no evidence for a signal and place an upper limit of B(B0 --> J/psi gamma) < 1.6 x 10^-6 at 90% confidence level.

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsBranching fractionRadiative decay01 natural sciencesEngineering physicsParticle identificationParticle decay0103 physical sciencesHigh Energy Physics::Experiment010306 general physicsStorage ringPhysical Review D
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