Search results for "PEP-II"

showing 2 items of 2 documents

Search for a Dark Leptophilic Scalar in e(+) e(-) Collisions

2020

Many scenarios of physics beyond the standard model predict the existence of new gauge singlets, which might be substantially lighter than the weak scale. The experimental constraints on additional scalars with masses in the MeV to GeV range could be significantly weakened if they interact predominantly with leptons rather than quarks. At an e+e- collider, such a leptophilic scalar (φL) would be produced predominantly through radiation from a τ lepton. We report herein a search for e+e-→τ+τ-φL, φL→ℓ+ℓ- (ℓ=e, μ) using data collected by the BABAR experiment at SLAC. No significant signal is observed, and we set limits on the φL coupling to leptons in the range 0.04<mφL<7.0 GeV. These bounds s…

:Kjerne- og elementærpartikkelfysikk: 431 [VDP]Electron–positron annihilationPhysics beyond the Standard ModelGeneral Physics and Astronomy01 natural sciencesElementary particlecurrent: constraintE+e- collider[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]HEP BaBarMathematical physicsPhysicstau: pair productionnew physics: search forSettore FIS/01 - Fisica Sperimentalescale: electroweak interactionelectron positron: colliding beamsModel estàndard (Física nuclear)Standard model (Nuclear physics)Monte Carlo method:Nuclear and elementary particle physics: 431 [VDP]The standard modelConfidence levelPEP-IIAnomalous magnetic momentleptonic decayScalar (mathematics)lepton: couplinganomalycoupling constant: upper limitelectron positron: annihilationNOMagnetic momentBABAR experimentlepton: coupling: high0103 physical sciencesParameter spaceBaBar; PEP-II; Rare decays;singlet: gauge010306 general physicsMètode de Montecarlomuon: magnetic momentHigh Energy Physics::PhenomenologyRare decaysSLAC PEP StorRare decay[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]BaBarElementary Particles and FieldsHigh Energy Physics::ExperimentLeptonexperimental results
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Measurements of the Absolute Branching Fractions of B± →k±Xc c

2020

A study of the two-body decays B±→XccK±, where Xcc refers to one charmonium state, is reported by the BABAR Collaboration using a data sample of 424 fb-1. The absolute determination of branching fractions for these decays are significantly improved compared to previous BABAR measurements. Evidence is found for the decay B+→X(3872)K+ at the 3σ level. The absolute branching fraction B[B+→X(3872)K+]=[2.1±0.6(stat)±0.3(syst)]×10-4 is measured for the first time. It follows that B[X(3872)→J/ψπ+π-]=(4.1±1.3)%, supporting the hypothesis of a molecular component for this resonance.

PhysicsParticle physics:Kjerne- og elementærpartikkelfysikk: 431 [VDP]Meson010308 nuclear & particles physicsElectron–positron annihilationGeneral Physics and AstronomyBaBar experimentBottom mesonBaBar; PEP-II; B meson; Bottom mesons;Bottom mesonsB mesonBranching (polymer chemistry)7. Clean energy01 natural sciencesLower limitHEPNO:Nuclear and elementary particle physics: 431 [VDP]0103 physical sciencesBaBarPEP-IIB meson010306 general physicsBar (unit)
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