Search results for "electron positron: colliding beams"

showing 4 items of 4 documents

Search for a Stable Six-Quark State at BABAR

2019

Recent investigations have suggested that the six-quark combination uuddss could be a deeply bound state (S) that has eluded detection so far, and a potential dark matter candidate. We report the first search for a stable, doubly strange six-quark state in Upsilon -> S anti-Lambda anti-Lambda decays based on a sample of 90 million Upsilon(2S) and 110 million Upsilon(3S) decays collected by the BABAR experiment. No signal is observed, and 90% confidence level limits on the combined Upsilon(2S,3S) -> S anti-Lambda anti-Lambda branching fraction in the range (1.2-1.4)x10^-7 are derived for m_S < 2.05 GeV. These bounds set stringent limits on the existence of such exotic particles.

:Kjerne- og elementærpartikkelfysikk: 431 [VDP]branching ratio: upper limitElectron–positron annihilationBound stateGeneral Physics and AstronomyBaBar experimentQuarksUpsilon(10355): rare decayUpsilon(10355): electroproductionUpsilon(10020): branching ratioparticle: exoticupsilon mesons: hadronic decay01 natural sciencesdecayHigh Energy Physics - ExperimentHigh Energy Physics - Experiment (hep-ex)Upsilon(10020): electroproductionBound state[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]PhysicQCQBExotic particlesPhysicsnew physics: search forSettore FIS/01 - Fisica Sperimentaleelectron positron: colliding beamsdetector limits decay:Nuclear and elementary particle physics: 431 [VDP]ParticlesDark matter (Astronomy)Confidence levelbaryon: dark matterUpsilon(10020): rare decayBranching fractionMatèria fosca (Astronomia)QuarkParticle physicsDark matterFOS: Physical sciencesLambda: pair productionelectron positron: annihilationPartícules (Matèria)NOPhysics and Astronomy (all)BABAR experiment0103 physical sciencesAtomic physicUpsilon(10355): branching ratio010306 general physicsdetectorBranching fractiondark matter: massState (functional analysis)stabilitySLAC PEP StorHEPA-stableBaBarElementary Particles and FieldsHigh Energy Physics::Experimentlimitsexperimental results

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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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Observation of e + e − → ηψ(2S) at center-of-mass energies from 4.236 to 4.600 GeV

2021

Journal of high energy physics 2021(10), 177 (2021). doi:10.1007/JHEP10(2021)177

ExoticsNuclear and High Energy Physicsmeasured [channel cross section]e+-e− ExperimentsQuarkoniumannihilation [electron positron]QC770-798electron positron: annihilationetaParticle and resonance productionMeasure (mathematics)530Standard deviationNONuclear physicsSubatomär fysikCross section (physics)e+-e�� Experimentsenergy dependence: measured [cross section]Astronomi astrofysik och kosmologiNuclear and particle physics. Atomic energy. RadioactivitySubatomic PhysicsAstronomy Astrophysics and Cosmologyddc:530e+-e− Experiments Exotics Particle and resonance production Quarkoniumpsi(3685)PhysicsBESe(+)-e(-) ExperimentsDetectorstatistical [error]electron positron --> eta psi(3685)e +-e − Experimentselectron positron: colliding beamsBeijing Stor4.236-4.600 GeV-cmsCollisionerror: statisticalYield (chemistry)e-e Experimentselectron positron --> eta psi(3685)colliding beams [electron positron]High Energy Physics::ExperimentCenter of masscross section: energy dependence: measuredchannel cross section: measuredStorage ringexperimental results

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The Belle II Physics Book

2019

cd. autorów: L. Cao48,‡, G. Caria145,‡, G. Casarosa57,‡, C. Cecchi56,‡,D. Cˇ ervenkov10,‡,M.-C. Chang22,‡, P. Chang92,‡, R. Cheaib146,‡, V. Chekelian83,‡, Y. Chen154,‡, B. G. Cheon28,‡, K. Chilikin77,‡, K. Cho70,‡, J. Choi14,‡, S.-K. Choi27,‡, S. Choudhury35,‡, D. Cinabro170,‡, L. M. Cremaldi146,‡, D. Cuesta47,‡, S. Cunliffe16,‡, N. Dash33,‡, E. de la Cruz Burelo9,‡, E. de Lucia52,‡, G. De Nardo54,‡, †Editor. ‡Belle II Collaborator. §Theory or external contributing author. M. De Nuccio16,‡, G. De Pietro59,‡, A. De Yta Hernandez9,‡, B. Deschamps129,‡, M. Destefanis60,‡, S. Dey116,‡, F.Di Capua54,‡, S.Di Carlo75,‡, J. Dingfelder129,‡, Z. Doležal10,‡, I. Domínguez Jiménez125,‡, T.V. Dong30,26,…

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