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国家自然科学基金(10575052)

作品数:5 被引量:3H指数:1
相关作者:吕林霞肖振军更多>>
相关机构:南京师范大学更多>>
发文基金:国家自然科学基金国家教育部博士点基金更多>>
相关领域:理学更多>>

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B→f_0(980)(π,η^((')) decays in the PQCD approach被引量:1
2009年
Based on the assumption of a two-quark structure of the scalar meson f0(980) ,we calculate the branching ratios and CP-violating asymmetries for the four B → f0(980) π and B → f0(980) η^(') decays by employing the perturbative QCD(pQCD) factorization approach. The leading order pQCD predictions for branching ratios are,Br(B^-→ f0(980) π^-) ~ 2.5×10^-6,Br(Bˉ^0 → f0(980) π^0) ~ 2.6×10^-7,Br(Bˉ^0 → f0(980) η) ~ 2.5×10^-7 and Br(Bˉ^0 → f0(980) η ) ~ 6.7×10^-7,which are consistent with both the QCD factorization predictions and the experimental upper limits.
张志清肖振军
B→πη('),η(')η(') decays and NLO contributions in the pQCD approach被引量:1
2009年
By employing the perturbative QCD (pQCD) factorization approach, we calculate the full leading and the partial next-to-leading order (NLO) contributions to the seven B →πη(′) and η(′)η(′) decays. For B^+→ π+η(′) decays, the pQCD predictions for their decay rates agree very well with the data after the inclusion of the small NLO contributions. For neutral decays, the pQCD predictions are also consistent with the experimental upper limits and can be tested by the LHC experiments. The measured value of dir .Acp^dir(π+η)= 19±7% can also be accommodated by the pQCD approach.
张志清刘新肖振军
Study of scalar meson a_0(980) from B→a_0(980)π decays
2010年
In this paper, we calculate the branching ratios and the direct CP-violating asymmetries for decays B^0 → a0^0(980)π^0, a0^+ (980)π^-, a0^-(980)π^+ and B^- → a0^0 (980)π^-, a0^- (980)π^0 by employing the perturbative QCD (pQCD) factorization approach at the leading order. We found that (a) the pQCD predictions for the branching ratios are around (0.4-2.8) × 10^-6, consistent with currently available experimental upper limits; (b) the CP asymmetries of B^0→ a0^0(980)π^0 and B^- → a0^- (980)π^0 decays can be large, about (70-80)% for α= 100°.
张志清肖振军
在T2HDM模型中中性希格斯粒子对B→X_s1+1-衰变过程的影响(英文)被引量:2
2007年
在T2HDM模型中计算了中性希格斯粒子圈图对稀有衰变过程B→X_s1+1-的贡献.通过计算发现:(a)中性希格斯粒子对衰变过程B→X_s1+1-的修正能够增强其标准模型的预言,但增幅很小;(b)在中性希格斯玻色子的质量大于100GeV和tanβ<40的情况下,中性希格斯粒子对稀有衰变过程B→X_s1+1-的分支比的贡献可忽略.
吕林霞肖振军
关键词:分支比
B→K_0~*(1430)η^(') decays in the pQCD approach
2010年
Based on the assumption of two-quark structure of the scalar meson K0^*(1430), we calculate the CP-averaged branching ratios for B→K0^*(1430)η(') decays in the framework of the perturbative QCD (pQCD) approach here. We perform the evaluations in two scenarios for the scalar meson spectrum. We find that: (a) the pQCD predictions for Br(B→K0^*(1430)η(')) which are about 10^-5 10^-6, basically agree with the data within large theoretical uncertainty; (b) the agreement between the pQCD predictions and the data in Scenario Ⅰ is better than that in Scenario Ⅱ, which can be tested by the forthcoming LHC experiments; (c) the annihilation contributions play an important role for these considered decays.
刘新张志清肖振军
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