Performance of the plugged-in ²² Na based slow positron beam facility

Abstract

CAO Xing-Zhong()

Dalitz plot analysis of the decay ω→π+π−π0

“…In this analysis, three-body decays without FSI are generated by a phase space generator (PHSP) in which events are produced with uniform distribution in their Dalitz plot. The production of the J=ψ resonance is simulated with the MC generator KKMC [13,14], while the decays are generated with EVTGEN [15] with branching fractions being set to the world average values [8] for the known decay modes, and with LUNDCHARM [16,17] for the remaining unknown decays. We use an inclusive sample of 1.2 × 10 9 simulated J=ψ events to identify background contributions.…”

Search for the decay Ds+→pp¯e+Ablikim1, Ачасов2, Adlarson3 et al. 2019Phys. Rev. D0000View full textAdd to dashboardCite

“…Additionally, the continuum process (e þ e − → qq, q ¼ u, d, and s), Bhabha scattering, μ þ μ − , τ þ τ − , as well as two-photon process are included. The open charm processes are generated using CONEXC [17] and their subsequent decays are modeled by EVTGEN [18] with the known branching fractions from the Particle Data Group [19], and the remaining unknown decay modes of the narrow cc resonances are generated using the modified LUND model [20]. The signal model is described by Eq.…”

Search for rare decay J/ψ→ϕe+e−

“…The production of the ψð3686Þ resonance is simulated by the Monte Carlo (MC) generator KKMC [6], which incorporates the effects of the energy spread of the beam and initial-state radiation. Known decays are generated by EVTGEN [7] using the branching fractions quoted by the Particle Data Group (PDG) [8], and the remaining unknown decays are generated with the LUNDCHARM model [9].…”