0000000000056398

AUTHOR

H.r. Qi

showing 12 related works from this author

Measurement of the absolute branching fraction for Λc+→Λμ+νμ

2017

Abstract We report the first measurement of the absolute branching fraction for Λ c + → Λ μ + ν μ . This measurement is based on a sample of e + e − annihilation data produced at a center-of-mass energy s = 4.6  GeV , collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567  pb − 1 . The branching fraction is determined to be B ( Λ c + → Λ μ + ν μ ) = ( 3.49 ± 0.46 ( stat ) ± 0.27 ( syst ) ) % . In addition, we calculate the ratio B ( Λ c + → Λ μ + ν μ ) / B ( Λ c + → Λ e + ν e ) to be 0.96 ± 0.16 ( stat ) ± 0.04 ( syst ) .

Nuclear and High Energy PhysicsBESIII детекторElectron–positron annihilationAnalytical chemistryAstrophysics::Cosmology and Extragalactic Astrophysics01 natural sciencesLuminosityNOлептоны0103 physical sciencesAbsolute branching fraction010306 general physicsNuclear ExperimentPhysicsAnnihilation010308 nuclear & particles physicsBranching fraction?c +Absolute branching fraction; BESIII; Semi-leptonic decay; Λc+; Nuclear and High Energy PhysicsBESIIIΛc+lcsh:QC1-999BaryonBEPCII коллайдерSemi-leptonic decayHigh Energy Physics::ExperimentAstrophysics::Earth and Planetary Astrophysicslcsh:Physics
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Measurement of cross sections of the interactions e+e−→ ϕϕω and e+e−→ ϕϕϕ at center-of-mass energies from 4.008 to 4.600 GeV

2017

Abstract Using data samples collected with the BESIII detector at the BEPCII collider at six center-of-mass energies between 4.008 and 4.600 GeV, we observe the processes e + e − → ϕ ϕ ω and e + e − → ϕ ϕ ϕ . The Born cross sections are measured and the ratio of the cross sections σ ( e + e − → ϕ ϕ ω ) / σ ( e + e − → ϕ ϕ ϕ ) is estimated to be 1.75 ± 0.22 ± 0.19 averaged over six energy points, where the first uncertainty is statistical and the second is systematic. The results represent first measurements of these interactions.

Nuclear and High Energy PhysicsBESIII детекторe+e- annihilationElectron–positron annihilation01 natural sciencesNOlaw.inventionNuclear physicsCross section (physics)law0103 physical sciencesCross section; e+e−annihilation; Triple quarkonia; Nuclear and High Energy Physics010306 general physicsColliderTriple quarkoniaPhysicsAnnihilationCross section010308 nuclear & particles physicse+e−annihilatione+e− annihilationlcsh:QC1-999BEPCII коллайдерe+e? annihilationCenter of massCross section; e+e- annihilation; Triple quarkonia; Nuclear and High Energy Physicslcsh:Physics
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Measurements of Sigma(+) and Sigma(-) time-like electromagnetic form factors for center-of-mass energies from 2.3864 to 3.0200 GeV

2021

Physics letters / B 814, 136110 (2021). doi:10.1016/j.physletb.2021.136110

Nuclear and High Energy Physicselectric [form factor]Electron–positron annihilationFOS: Physical sciencesSigma hyperonannihilation [electron positron]BESIII; Cross section; Electromagnetic form factor; Σ hyperonhyperon53001 natural sciencesHigh Energy Physics - ExperimentNOSubatomär fysikHigh Energy Physics - Experiment (hep-ex)Angular distributionAstronomi astrofysik och kosmologi0103 physical sciencesSubatomic PhysicsAstronomy Astrophysics and Cosmologyddc:530angular distributionstructure010306 general physicsElectromagnetic form factorPhysics2.3864-3.0200 GeV-cmsBESelectron positron --> Sigma+ Sigma-Cross section010308 nuclear & particles physicsHyperonBESIIIBeijing Storlcsh:QC1-999Sigma HyperonBaryonΣ hyperonmagnetic [form factor]ratio [form factor]valence [quark]colliding beams [electron positron]High Energy Physics::Experimentpair production [Sigma+]Atomic physicsform factor [Sigma-]electromagnetic [form factor]lcsh:Physicsform factor [Sigma+]experimental results
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Measurement of the inclusive branching fraction for ψ(3686)→KS0+anything

2021

Abstract Using 5.9 pb−1 of e + e − annihilation data collected at center-of-mass energies from 3.640 to 3.701 GeV with the BESIII detector at the BEPCII Collider, we measure the observed cross sections of e + e − → K S 0 X (where X = anything ). From a fit to these observed cross sections with the sum of continuum and ψ ( 3686 ) and J / ψ Breit-Wigner functions and considering initial state radiation and the BEPCII beam energy spread, we obtain for the first time the product of ψ ( 3686 ) leptonic width and inclusive decay branching fraction Γ ψ ( 3686 ) e e B ( ψ ( 3686 ) → K S 0 X ) = ( 373.8 ± 6.7 ± 20.0 ) eV, and assuming Γ ψ ( 3686 ) e e is ( 2.33 ± 0.04 ) keV from PDG value, we measur…

PhysicsNuclear and High Energy PhysicsAnnihilation010308 nuclear & particles physicsBranching fractionContinuum (design consultancy)01 natural sciencesMeasure (mathematics)law.inventionNuclear physicslaw0103 physical sciences010306 general physicsColliderBeam energyPhysics Letters B
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Σ+ and Σ¯− Polarization in the J/ψ and ψ(3686) Decays

2020

From 1310.6 x 10(6) J/psi and 448.1 x 10(6) psi (3686) events collected with the BESIII experiment, we report the first observation of Sigma(+) and (Sigma) over bar (-) spin polarization in e(+)e(- ...

PhysicsSpin polarization0103 physical sciencesGeneral Physics and AstronomySigmaHigh Energy Physics::ExperimentAtomic physics010306 general physicsPolarization (waves)01 natural sciencesPhysical Review Letters
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Measurement of cross section for e+e−→Ξ0Ξ¯0 near threshold

2021

Abstract Using e + e − collision data at ten center-of-mass energies between 2.644 and 3.080 GeV collected with the BESIII detector at BEPCII and corresponding to an integrated luminosity of about 500 pb−1, we measure the cross sections and effective form factors for the process e + e − → Ξ 0 Ξ ¯ 0 utilizing a single-tag method. A fit to the cross section of e + e − → Ξ 0 Ξ ¯ 0 with a pQCD-driven power function is performed, from which no significant resonance or threshold enhancement is observed. In addition, the ratio of cross sections for the processes e + e − → Ξ − Ξ ¯ + and Ξ 0 Ξ ¯ 0 is calculated using recent BESIII measurement and is found to be compatible with expectation from isosp…

PhysicsNuclear and High Energy PhysicsLuminosity (scattering theory)010308 nuclear & particles physics01 natural sciencesMeasure (mathematics)Resonance (particle physics)Symmetry (physics)Nuclear physicsCross section (physics)Near thresholdIsospin0103 physical sciences010306 general physicsPower functionPhysics Letters B
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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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Observation of ψ(3686)→η′e+e−

2018

Abstract Using a data sample of 448.1 × 10 6 ψ ( 3686 ) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay ψ ( 3686 ) → η ′ e + e − , with significances of 7.0σ and 6.3σ when reconstructing the η ′ meson via its decay modes η ′ → γ π + π − and η ′ → π + π − η ( η → γ γ ), respectively. The weighted average branching fraction is determined to be B ( ψ ( 3686 ) → η ′ e + e − ) = ( 1.90 ± 0.25 ± 0.11 ) × 10 − 6 , where the first uncertainty is statistical and the second systematic.

Dalitz decayNuclear and High Energy PhysicsMesonElectron–positron annihilationBESIII; Charmonium; Dalitz decay; e+e− Annihilation; Nuclear and High Energy Physicse + e − Annihilation01 natural sciencesOmegaNOlaw.inventionBESIII; Charmonium; Dalitz decay; e+e−Annihilation; Nuclear and High Energy PhysicsNuclear physicslaw0103 physical sciencese+e−Annihilation010306 general physicsColliderCharmoniumPhysics010308 nuclear & particles physicsGenerator (category theory)Branching fractionBESIIIe+e− AnnihilationPseudoscalarBESIII; Charmonium; Dalitz decay; e + e − Annihilation ; Nuclear and High Energy PhysicsPhysics Letters B
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Measurement of the absolute branching fraction of Λc+→pKS0η decays

2021

Abstract Based on 586 p b − 1 of e + e − annihilation data collected at a center-of-mass energy of s = 4.6 GeV with the BESIII detector at the BEPCII collider, the absolute branching fraction of Λ c + → p K S 0 η decays is measured for the first time to be B ( Λ c + → p K S 0 η ) = ( 0.414 ± 0.084 ± 0.028 ) % , where the first uncertainty is statistical and the second is systematic. The result is compatible with a previous CLEO result on the relative branching fraction B ( Λ c + → p K S 0 η ) B ( Λ c + → p K − π + ) , and consistent with theoretical predictions of SU(3) flavor symmetry.

PhysicsNuclear and High Energy PhysicsParticle physicsAnnihilation010308 nuclear & particles physicslawBranching fraction0103 physical sciences010306 general physicsCollider01 natural sciencesSymmetry (physics)law.inventionPhysics Letters B
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Measurements of cross section of e+e−→pp¯π0 at center-of-mass energies between 4.008 and 4.600 GeV

2017

Based on e(+)e(-) annihilation data samples collected with the BESIII detector at the BEPCII collider at 13 center-of-mass energies from 4.008 to 4.600 GeV, measurements of the Born cross section o ...

PhysicsNuclear and High Energy PhysicsParticle physicsAnnihilationPhysics::Instrumentation and Detectors010308 nuclear & particles physicsPartial wave analysisElectron–positron annihilationHadronDalitz plot01 natural scienceslaw.inventionNuclear physicslaw0103 physical sciencesHigh Energy Physics::ExperimentCenter of massBorn approximation010306 general physicsColliderPhysics Letters B
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Measurements of the branching fractions for D+→KS0KS0K+, KS0KS0π+ and D0→KS0KS0, KS0KS0KS0

2017

Abstract By analyzing 2.93 fb − 1 of data taken at the ψ ( 3770 ) resonance peak with the BESIII detector, we measure the branching fractions for the hadronic decays D + → K S 0 K S 0 K + , D + → K S 0 K S 0 π + , D 0 → K S 0 K S 0 and D 0 → K S 0 K S 0 K S 0 . They are determined to be B ( D + → K S 0 K S 0 K + ) = ( 2.54 ± 0.05 s t a t . ± 0.12 s y s . ) × 10 − 3 , B ( D + → K S 0 K S 0 π + ) = ( 2.70 ± 0.05 s t a t . ± 0.12 s y s . ) × 10 − 3 , B ( D 0 → K S 0 K S 0 ) = ( 1.67 ± 0.11 s t a t . ± 0.11 s y s . ) × 10 − 4 and B ( D 0 → K S 0 K S 0 K S 0 ) = ( 7.21 ± 0.33 s t a t . ± 0.44 s y s . ) × 10 − 4 , where the second one is measured for the first time and the others are measured wit…

PhysicsNuclear and High Energy PhysicsMeson010308 nuclear & particles physicsElectron–positron annihilation0103 physical sciencesHadronAnalytical chemistryResonance010306 general physicsBranching (polymer chemistry)01 natural sciencesPhysics Letters B
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Measurement of proton electromagnetic form factors in the time-like region using initial state radiation at BESIII

2021

Physics letters / B 817, 136328 (2021). doi:10.1016/j.physletb.2021.136328

Protonannihilation [electron positron]01 natural sciencesform factor [electron]High Energy Physics - ExperimentSubatomär fysikHigh Energy Physics - Experiment (hep-ex)BESIII; Electromagnetic form factors; Initial state radiation; ProtonSubatomic Physicsangular distributionNuclear ExperimentPhysicsPhysicsForm factor (quantum field theory)initial-state interaction [radiation]Beijing Stormagnetic [form factor]ratio [form factor]electron positron --> p anti-pcolliding beams [electron positron]ProtonInitial State Radiationpair production [p]electromagnetic [form factor]Born approximationNuclear and High Energy Physicsdata analysis methodQC1-999FOS: Physical sciencesRadiation5303.773-4.600 GeV-cmsNONuclear physicsCross section (physics)Angular distributionElectromagnetic form factors0103 physical sciencesform factor [p]tree approximationddc:530010306 general physicsinitial stateBES010308 nuclear & particles physicshelicity [p]BESIIIState (functional analysis)(p anti-p) [mass spectrum]Electromagnetic form FactorsHigh Energy Physics::Experimentproduction [threshold]Initial state radiationexperimental results
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