通知公告
近物所報(bào)告:Scalar form factors in semileptonic heavy-to-light transitions
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報(bào)告題目:Scalar form factors in semileptonic heavy-to-light transitions
報(bào)告人: 姚德良博士 西班牙瓦倫西亞大學(xué)
時(shí)間安排:2018年1月16日10:00
地點(diǎn):近代物理所5號(hào)樓1008會(huì)議室
報(bào)告摘要:By solving the Muskhelishvili Omnes integral equations, the scalar form factors of the semileptonic D and B meson decays are studied. As inputs, we employ the unitarized amplitudes from chiral effective theory for the energy region not far from thresholds, while, at high energies, proper asymptotic conditions are imposed. The scalar form factors are expressed in terms of the Omnes matrices multiplied by vector polynomials. The lattice QCD results both in the charm and the bottom sectors can be well described simultaneously. Based on our combined fit, the Cabibbo-Kobayashi-Maskawa (CKM) elements of of |Vcd|, |Vcs| and |Vub| are extracted. In addition, we predict the corresponding vector form factors related by chiral SU(3) symmetry, which will serve as alternatives to determine the CKM elements when experimental measurements of the corresponding differential decay rate are available.
報(bào)告人簡(jiǎn)介:姚德良博士,2008年7月本科畢業(yè)于北京師范大學(xué)物理系,同年保送進(jìn)入北京大學(xué)物理學(xué)院理論物理研究所,2013年7月獲得物理學(xué)博士學(xué)位。2013年9月至2016年12月,在德國(guó)Juelich研究中心做博士后。2016年12月—至今,在西班牙瓦倫西亞大學(xué)與皇家科學(xué)院IFIC研究所做博士后。研究方向主要是利用有效場(chǎng)論(手征微擾理論)與色散關(guān)系研究強(qiáng)子物理和核物理。在協(xié)變重子手征微擾理論方面做過(guò)重要貢獻(xiàn),成功地在單圈水平給出了介子核子散射等一些重要基本過(guò)程的最恰當(dāng)手征描述,發(fā)展了不穩(wěn)定粒子的手征動(dòng)力學(xué),提出了將重子手征微擾理論推廣到中高能區(qū)域的辦法。此外,在奇特強(qiáng)子態(tài)方面以及味物理方面也有一定的研究。