0000000000405101

AUTHOR

Z.q. Zhang

showing 2 related works from this author

Branching Ratios and Spectral Functions of $\tau$ Decays: final ALEPH measurements and physics implications

2005

The full LEP-1 data set collected with the ALEPH detector at the $Z$ pole during 1991-1995 is analysed in order to measure the $\tau$ decay branching fractions. Extensive systematic studies are performed, in order to match the large statistics of the data sample corresponding to over 300 000 measured and identified $\tau$ decays. Branching fractions are obtained for the two leptonic channels and eleven hadronic channels defined by their respective numbers of charged particles and $\pi^0$'s. Using previously published ALEPH results on final states with charged and neutral kaons, corrections are applied to the hadronic channels to derive branching ratios for exclusive final states without kao…

tau; branching fractions; Z poleParticle physicsbranching fractionElectron–positron annihilationHadronFOS: Physical sciencesGeneral Physics and AstronomyStrangeness01 natural sciencesAsymptotic freedomhadronicHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)tau decay; PION FORM-FACTOR; ELECTROWEAK RADIATIVE-CORRECTIONSquantum chromodynamictau decay0103 physical sciences[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]tau010306 general physicsMinimal subtraction schemeQuantum chromodynamicsPhysics010308 nuclear & particles physicsZ poleHigh Energy Physics::PhenomenologyCharged particle3. Good healthsum rulebranching fractionsIsospinHigh Energy Physics::ExperimentELECTROWEAK RADIATIVE-CORRECTIONSParticle Physics - ExperimentPION FORM-FACTOR
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Observation of the doubly radiative decay η′→γγπ0

2017

Based on a sample of 1.31 billion J/psi events collected with the BESIII detector, we report the study of the doubly radiative decay eta' -> gamma gamma pi(0) for the first time, where the eta' meson is produced via the J/psi -> gamma eta' decay. The branching fraction of eta' -> gamma gamma pi(0) inclusive decay is measured to be B(eta' -> gamma gamma pi(0))(Incl) = (3.20 +/- 0.07(stat) +/- 0.23(sys)) x 10(-3), while the branching fractions of the dominant process eta' -> gamma omega and the non-resonant component are determined to be B(eta' -> gamma omega) x B(omega -> gamma pi(0)) = (23.7 +/- 1.4(stat) +/- 1.8(sys)) x 10(-4) and B(eta' -> gamma gamma pi(0))(NR) = (6.16 +/- 0.64(stat) +/-…

PhysicsMeson010308 nuclear & particles physicsBranching fractionAstrophysics::High Energy Astrophysical PhenomenaElectron–positron annihilationRadiative decay01 natural sciencesOmegaGamma gammaNuclear physics0103 physical sciencesPiHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsPhysical Review D
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