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Monte Carlo Simulation on Measurements of Branching Fractions for Some Exclusive Semileptonic Decays of Neutral D Mesons on BES-Ⅲ

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Chinese Physics Letters 2008年第4期25卷 1231-1234页

作者：刘汇慧陈江川荣刚马海龙赵明刚刘健 Department of Physics Henan University of Science and Technology Luoyang 471003 Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049

Using the Monte Carlo samples of about 800 pb^-1 and 500 pb^-1 generated at and around 3.773 GeV with BOSS （BESⅢ Offtine Software System） 6.0.2 and BOSS 6.1.0, we have studied the branching fractions for D^0 → K^-l^＋vl and D^0 →π^- l^＋ vl （l=e, μ）. According to the simulation results, the expected precision of these measurements for 20fb^-1 ψ（3770） data which will be collected on BESⅢ are well estimated.

关键词： D mesons meson decay Monte Carlo methods semileptonic decays

Monte Carlo Simulation on Glueball Search at BESIII

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Chinese Physics Letters 2007年第7期24卷 1857-1860页

作者：秦虎沈肖雁 Institute of High Energy Physics Academy of Sciences Beijing 100049

The J/ψ radiative decays are suggested as promising modes for glueball search. A full Monte Carlo simulation of J/ψ →γηη and γηη, based on the design of BESIII detector, is performed to study the sensitivity... 详细信息

关键词： J/PSI RADIATIVE DECAYS CANDIDATE F(J)(2220) 2-PHOTON PRODUCTION LATTICE SU(3) SPECTRUM

Recent results on light hadron spectroscopy from BESⅡ

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Chinese Physics C 2008年第6期32卷 448-451页

作者：沈肖雁 Institute of High Energy Physics CAS

We reported the observation of Y（2175） in Фfo（980） mass spectrum in J/ψ → ηФfo（980） with fo（980） →π＋π^- and the observation of a broad 1^-- resonance of K^＋K^- mass in J/ψ→ K^＋K^-π^0. The results... 详细信息

关键词： J/ψ decay invariant mass spectrum resonance partial wave analysis

Role of t-channel meson exchanges in S-wave πN and KN scatterings

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Chinese Physics C 2008年第8期32卷 629-633页

作者：吴锋泉张印杰邹冰松 Institute of High Energy Physics Chinese Academy of Sciences

The low-energy S-wave πN and KN scatterings are studied by using the K-matrix approach within the meson exchange framework. The t-channel meson exchanges, especially ρ and σ exchanges, are found to play a very important role in these two processes. The t-channel p exchange determines the isospin structure of the scattering amplitudes, it gives attractive force in the low isospin state but repulsive force in the high isospin state. The t-channel σ exchange gives a very large contribution in these two processes, while it is negligible in meson-meson S-wave scatterings.

关键词： meson exchange K-matrix πK KN

Study of ■ decay parameter in J/ψ→Λ■ decay

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Chinese Physics C 2008年第9期32卷 692-696页

作者：钟彬平荣刚肖振军 Department of Physics and Institute of Theoretical Physics Nanjing Normal University Institute of High Energy Physics CASP.O.Box 918(4)

The helicity amplitudes for Jψ→ ∧∧ and the relevant background decays are presented for measuring the ∧ decay parameter α ＋（∧ → pπ^＋） in J/ψ→ ∧∧. The Monte Carlo （MC） simulations based on the helicity amplitudes information are carried out. The likelihood fit method to determine the .∧ decay parameter is presented. Based on the MC generated sample, the sensitivity of the measurement for α＋ has been estimated, which shows that the J/ψ→ ∧∧ channel can be used to measure the .∧ decay parameter α＋（∧ → pπ^＋） well.

关键词： parity asymmetry hyperon nonleptonic decays J/ψ decays

Angular Distributions for Heavy Quarkonium Decays into Baryon-Antibaryon Pairs

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Chinese Physics Letters 2007年第6期24卷 1441-1443页

作者：庞彩莹平荣刚 lnstitute of High Energy Physics Chinese Academy of Sciences PO BOX 918(1) Beijing 100049 College of Physics and Electronic Engineering Guangxi Normal University Guilin 541004

Based on the naive quark model, we calculate angular distributions for heavy quarkonium decays into pN＊（1440）, decuplet baryon pairs, and octet-decuplet baryon pairs. The general formulae of angular distributions are given explicitly. Quark mass effects on the violation of the helicity conservation and the prospect to look for them in J/ψ hadronic decays are discussed.

关键词： PSI

A new mechanism for the electromagnetic transition γ^＊N→N^＊（1535）

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Chinese Physics C 2010年第2期34卷 245-248页

作者：安春生邹冰松 Institute of High Energy Physics CAS Graduate University of Chinese Academy of Sciences Theoretical Physics Center for Science Facilities CAS

The heiicity amplitude A1/2^P for the electromagnetic transition γ^＊N→N^＊（1535） is investigated. It is found that a new mechanism γ^＊→q^-q plays an important role in order to improve the description of this transition. On one hand, the A1/2^p is decreased to fall in the data range at the photon point Q^2 = 0, while on the other hand, the new mechanism makes the function A1/2^p（Q^2） to decrease more slowly vs increasing Q^2 as required by the data.

关键词： N^*(1535) electromagnetic transition helicity amplitudes

Study a_0(980)-f_0(980) mixing in charmonium decays

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Chinese Physics C 2010年第6期34卷 848-854页

作者：吴佳俊赵强邹冰松 Institute of High Energy Physics Chinese Academy of Sciences Theoretical Physics Center for Science Facilities CAS

In this proceeding, we propose to directly measure the a0^0（980）-f0 （980） mixing in J/ψ→φf0（980）→φa0^0（980） and Xc1→π^0a0^0（980） →π^0f0（980） with the upgraded Beijing Electron Positron Collider（BEPCII） with BESIII detector. We show that a narrow peak of about 8 MeV will be produced by the a0^0（980）-f0（980） mixing, and the predominant feature makes it standing out from the background contributions. The predicted branching ratios for these two reactions are both expected to be about O（10^-6）, which is unambiguously accessible with 10^9 J/ψ and 3 × 10^8 Xc1 at BESⅢ.

关键词： a0^0(980) f0(980) mixing BES

Rare semileptonic decays of heavy mesons in the heavy quark limit

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Chinese Physics C 2010年第2期34卷 262-266页

作者：李海波杨茂志 Institute of High Energy Physics CAS School of Physics Nankai University

We study the branching ratios of D^＋ → D^0e^＋ν, Ds^＋ → D^0e^＋ν, Bs^0→B^＋e^-^-ν, Ds^＋→D^＋e^-e^＋ and Bs^0→B^0e^-e^＋ rare semileptonic decay processes, which are induced by decays of light quarks, the heavy quarks remain unchanged. The branching ratios of these decay processes are estimated in the heavy quark limit and with SU（3） flavor symmetry. We find that the decay rates are very tiny in the framework of the Standard Model. We also estimate the sensitivities of the measurements of these rare decays at the future experiments, such as BES-Ⅲ, super-B and LHC-b. Observations of these decays may shed some light on new physics beyond the standard model.

关键词： weak decay heavy quark flavor symmetry