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1. chinaXiv:201703.00621 [pdf]

On two cryogenic systems of high purity germanium detector

Zhang Jian-Yong; Cai Xiao; MO Xiao-Hu
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties

Two cryogenic systems of high purity germanium detector, liquid nitrogen and mechanical coolers, are expound, together with explanations of merits and demerits for each kind of cooling methods. The resolutions of detector to the characteristic lines of 152Eu under different cooling conditions are studied. The laboratory results indicate that the mechanical cooler (X-Cooler II) is an ideal replacement candidate for the liquid nitrogen cooler that is being utilized by BEMS at BEPC-II.

submitted time 2017-03-26 Hits13177Downloads1332 Comment 0

2. chinaXiv:201703.00607 [pdf]

Study of the ρπ Puzzle in Charmonium Decays

MO Xiao-Hu; YUAN Chang-Zheng; WANG Pingz
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties

The theoretical explanations about the "ρπ puzzle" in charmonium decays are reviewed exten-sively, and the comparison of theoretical predications with experimental data is made whenever possible. Three methods to estimate the ratio of the branching fractions of J/ψ and ψ′decays are also discussed. It is pointed out that in order to understand the ρπ puzzle, and the dynamics of charmonium decays, systematic studies should be made in theory, phenomenology and experiment aspects.

submitted time 2017-03-26 Hits13231Downloads722 Comment 0

3. chinaXiv:201703.00600 [pdf]

Determination of ψ(2S) Total Number by Inclusive Hadronic Decay

MO Xiao-Hu; ZHU Yong-Sheng; YUAN Chang-Zheng; FU Cheng-Dong; Li Gang
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties

On the basis of the study of inclusive hadronic events, two methods are adopted to determine the number of produced ψ(2S) events collected by BES in 2001-2002 run, which is 14:0 ? 106 with the uncertainty of 4%.

submitted time 2017-03-26 Hits1155Downloads618 Comment 0

4. chinaXiv:201703.00592 [pdf]

The Contribution of One-photon Annihilation at ψ(2S) in e+e- Experiment

Wang Ping; Yuan Chang-Zheng; Mo Xiao-Hu
Subjects: Physics >> Condensed Matter: Structural, Mechanical and Thermal Properties

The continuum one-photon annihilation at ψ(2S) in e+e-?experiment is studied. Such contributions to the measured final state ωπ0 and π+π- at ψ(2S) mass are estimated by phenomenological models. It is found that these contributions must be taken into account in the determination of branching ratios of ψ(2S) →ωπ0 and ψ(2S) → π+π- , as well as other electromagnetic decay modes. The study eaches the conclusion that in order for BES to obtain the correct branching ratios on these decay modes, at least 10pb-1 of data below the ψ(2S) peak is needed.

submitted time 2017-03-26 Hits1019Downloads571 Comment 0

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