0000000000636982

AUTHOR

X.y. Shan

showing 4 related works from this author

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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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 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 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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