The principle of the method for the BESⅢ TOF calibration using cosmic ray data without magnetic field are reported in this paper. After applying calibration constants, the single-end readout time resolution could reach about 150 ps, and the time resolution for one layer is achieved to be about 110 ps. The paper also described the extraction scheme for the event start time of cosmic events.
The rate of high energy photons produced from energetic jets during their propagation through the QGP at RHIC and LHC is studied by taking into account the contribution of jet quenching in the medium. It is shown that the jet quenching effect reduces the rate of jet-photon conversion at large transverse momemtum by about 40% at RHIC with √s=200 AGeV, and by about 80% at LHC with √s=5500 AGeV.
The short-range correlation between nucleons in finite nuclei is investigated in high energy proton- nucleus andα-nuclens elastic scattering in the framework of Glauber multiple scattering theory without any free parameters.The effects on the p-~4He and ~4He-^(12)C elastic scattering,and in particular on the proton elastic scattering off hallo-like nuclei,^(6,8)He,are estimated.Our calculations show that the short-range correlations play an important role in reproducing experimental data and could be also thought of as being possible origin and nature of halo-like phenomena in the nuclear structure.More accurate calculations along this line are needed.
