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Spin-dependent Breit-Wigner and Fano resonances in photon-assisted electron transport through a semiconductor heterostructure
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作者 胡丽云 周斌 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第6期384-391,共8页
We theoretically investigate the electron transmission through a seven-layer semiconductor heterostructure with the Dresselhaus spin-orbit coupling under two applied oscillating fields. Numerical results show that bot... We theoretically investigate the electron transmission through a seven-layer semiconductor heterostructure with the Dresselhaus spin-orbit coupling under two applied oscillating fields. Numerical results show that both of the spindependent symmetric Breit-Wigner and the asymmetric Fano resonances appear and that the properties of these two types of resonance peaks are dependent on the amplitudc and the relative phases of the two applicd oscillating fields. The modulation of the spin-polarization efficiency of transmitted electrons by the relative phase is also discussed. 展开更多
关键词 spin orbit coupling Breit Wigner resonance Fano resonance
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结构材料重点核素^(60)Ni的共振参数评价 被引量:1
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作者 刘晓东 吕国雄 《江汉大学学报(社会科学版)》 2002年第2期26-29,共4页
利用多能级Breit-Wigner公式对60Ni的全截面进行了计算,并将计算结果与BNL-325(四版)进行比较.利用实验核数据库EXFOR提供的全截面数据及实验条件,对60Ni的可分辩区实验全截面进行了评价,推荐出一套可用于校验共振参数的实验全截面数... 利用多能级Breit-Wigner公式对60Ni的全截面进行了计算,并将计算结果与BNL-325(四版)进行比较.利用实验核数据库EXFOR提供的全截面数据及实验条件,对60Ni的可分辩区实验全截面进行了评价,推荐出一套可用于校验共振参数的实验全截面数据并与计算结果进行了比较. 展开更多
关键词 ^60Ni 参数评价 多能级breit-wigner公式 全截面 共振参数 结构材料 中子共振反应截面
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J/ψ→ωπ^+π^-衰变道中σ粒子存在的证据(英文) 被引量:1
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作者 BES合作组 《高能物理与核物理》 CSCD 北大核心 2004年第3期215-221,共7页
基于BESⅠ的 7 8× 10 6的J ψ数据样本 ,研究了J ψ→ωπ+ π-衰变 .在反冲ω粒子的π+ π-的不变质量谱中清楚地观察到了一个低质量端的突起 ,此突起既不来自相空间效应 ,又不来自本底 .根据分波分析 ,此低质量端的突起是一个 0 ... 基于BESⅠ的 7 8× 10 6的J ψ数据样本 ,研究了J ψ→ωπ+ π-衰变 .在反冲ω粒子的π+ π-的不变质量谱中清楚地观察到了一个低质量端的突起 ,此突起既不来自相空间效应 ,又不来自本底 .根据分波分析 ,此低质量端的突起是一个 0 + + 的共振态 ,即σ粒子 .如果用常数宽度的Breit Wigner函数来拟合σ粒子 ,其质量和宽度分别为 384± 6 6MeV和 4 5 8± 10 0MeV ,与其对应的极点位置是 (4 34± 78) -i(2 0 2± 4 3)MeV . 展开更多
关键词 σ粒子 手征粒子 共振态 J/Ψ衰变 反冲ω粒子 分波分析 breit-wigner函数 高能物理学
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Study of K*(892) mass and width splitting caused by model difference
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作者 李秀荣 苑长征 《Chinese Physics C》 SCIE CAS CSCD 2009年第5期321-326,共6页
According to the new K^*(892)^0 and K^*(892)^- masses reported by the BELLE experiment and the K^*(892)^0 mass reported by the FOCUS experiment, mass splitting between neutral and charged K^*(892) becomes ... According to the new K^*(892)^0 and K^*(892)^- masses reported by the BELLE experiment and the K^*(892)^0 mass reported by the FOCUS experiment, mass splitting between neutral and charged K^*(892) becomes very small. This is significantly different from the current world average values given by the Particle Data Group 2008. We find that there are differences between models used to fit the K^*(892) decay invariant mass spectra in different measurements and study the model dependence in the measurement of K^*(892) parameters. We refit the K^*(892)^0 mass spectra of the BELLE and FOCUS experiments with the formula used by BELLE in fitting K^*(892)^- to get new mass and width. After refitting, the K^*(892)^0 mass of the BELLE experiment becomes 1.4 MeV/c^2 larger than the initial value and that of the FOCUS experiment is 1 MeV/c^2 smaller than the initial value. We also fit the spectra of some other experiments to extract the K^* (892) parameters using the BELLE K^* (892)^- parametrization. 展开更多
关键词 K^* resonance parameters breit-wigner function
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