CCD camera system design for the beam diagnostic by using OTR

Abstract

Ying( ) 1,2 YANG Ke-Hu() 2 DAI Jian-Ping( ) 2;1)

Measurement of the e+e−→π+π− cross section between 600 and 900 MeV using initial state radiation

“…Inclusive MC samples at √ s = 3.773 and 4.178 GeV are used to investigate possible background contamination. They consist of inclusive hadronic processes (e + e − → q q, q = u, d, s) modeled with the LUARLW [35] at √ s = 3.773 GeV and KKMC [36,37] at √ s = 4.178 GeV, and the ISR production of vector charmonium states (e + e − → γJ/ψ, γψ(2S), γψ(3773)) generated with BESEVTGEN [38] using the VECTORISR model [39,40]. In addition, several exclusive MC samples are generated to study the background, with different event generators and models.…”

Observation of the decay $D^+_s\to ωπ^+η$

“…The samples include the production of open charm processes, the initial-state radiation production of vector charmonium(-like) states and the continuum processes incorporated in kkmc [16,17]. All particle decays are modelled with evtgen [18,19] using BFs either reported by the PDG [5], when available, or otherwise estimated with lundcharm [20,21]. Final state radiation from charged final state particles is incorporated using photos [22].…”

“…The signal decay D + s → ωπ + η is generated with a phase-space distribution. The MC samples of the decays D + s → ωa 0 (980) + and D + s → ηb 1 (1235) + , used to estimate the systematic uncertainty of MC models, are generated with the SVS model, which describes the decay of a scalar meson to vector plus scalar mesons [18,19].…”

Measurement of the Branching Fraction for the Decay $ψ(3686) \rightarrow ϕK_{S}^{0} K_{S}^{0}$

“…inclusive MC sample includes the production of the ψ(3686) resonance, the initial state radiation production of the J/ψ, and the continuum processes incorporated in kkmc [20]. All particle decays are modelled with evtgen [21,22] using BFs either taken from the Particle Data Group (PDG) [7], when available, or otherwise estimated with lundcharm [23,24]. Final state radiation from charged final state particles is incorporated using the photos package [25].…”