منابع مشابه
BESII Detector Simulation
A Monte Carlo program based on Geant3 has been developed for BESII detector simulation. The organization of the program is outlined, and the digitization procedure for simulating the response of various sub-detectors is described. Comparisons with data show that the performance of the program is generally satisfactory.
متن کامل2 00 4 A Study of J / ψ → γγV ( ρ , φ ) Decays with the BESII Detector
Using a sample of 58× 106 J/ψ events collected with the BESII detector, radiative decays J/ψ → γγV , where V = ρ or φ, are studied. A resonance around 1420 MeV/c2 (X(1424)) is observed in the γρ mass spectrum. Its mass and width are measured to be 1424 ± 10 (stat) ± 11 (sys) MeV/c2 and 101.0 ± 8.8 ± 8.8 MeV/c2, respectively, and its branching ratio B(J/ψ → γX(1424) → γγρ) is determined to be (1...
متن کاملA Study of J / ψ → γγV ( ρ , φ ) Decays with the BESII Detector
Using a sample of 58× 106 J/ψ events collected with the BESII detector, radiative decays J/ψ → γγV , where V = ρ or φ, are studied. A resonance around 1420 MeV/c2 (X(1424)) is observed in the γρ mass spectrum. Its mass and width are measured to be 1424 ± 10 (stat) ± 11 (sys) MeV/c2 and 101.0 ± 8.8 ± 8.8 MeV/c2, respectively, and its branching ratio B(J/ψ → γX(1424) → γγρ) is determined to be (1...
متن کاملSimulation of a Neutron Detector for Real Time Imaging Applications
Monte Carlo Method is used to simulate a double layer gadolinium-amorphous silicon thermal neutron detector. The detector fabricated in pixel array configuration has various applications including neutron imaging. According to the simulation results, a detector consisting of a gadolinium (Gd) film with thickness of 2-4 ~m, sandwiched properly with two layers of sufficiently thick (-30 ?µm) hydr...
متن کاملRecent J/ψ Results from BESII
There is an accumulation of evidence for anomalous behavior in the pp̄ system near 2mp mass threshold. We analyze J/ψ → γpp̄ with BESII J/ψ data 2. Fig. 1 shows the pp̄ invariant mass distribution for selected events. Except for a peak near Mpp̄ = 2.98 GeV/c 2 that is consistent in mass, width, and yield with expectations for J/ψ → γηc, ηc → pp̄ 3 and a broad enhancement around Mpp̄ ∼ 2.2 GeV/c, ther...
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ژورنال
عنوان ژورنال: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
سال: 2005
ISSN: 0168-9002
DOI: 10.1016/j.nima.2005.06.079