The B -> pi l nu semileptonic form factor from three-flavor lattice QCD: A model-independent determination of |V(ub)|
Jon A. Bailey, C. Bernard, C. DeTar, M. Di Pierro, A. X. El-Khadra, R. T. Evans, E. D. Freeland, E. Gamiz, Steven Gottlieb, U. M. Heller, J. E. Hetrick, A. S. K… 展开作者
Jon A. Bailey, C. Bernard, C. DeTar, M. Di Pierro, A. X. El-Khadra, R. T. Evans, E. D. Freeland, E. Gamiz, Steven Gottlieb, U. M. Heller, J. E. Hetrick, A. S. Kronfeld, J. Laiho, L. Levkova, P. B. Mackenzie, M. Okamoto, J. N. Simone, R. Sugar, D. Toussaint, R. S. Van de Water
备注:
59 pages, 11 figures v2: Added table with form factor covariance matrix. Added references. v3: Fixed typos. Corrected heavy-quark discretization errors and subsequent determination of Vub. Central value of Vub unchanged, but error in Vub changed in last decimal place. Version submitted to Phys. Rev. D
We calculate the form factor f_+(q^2) for B-meson semileptonic decay in unquenched lattice QCD with 2+1 flavors of light sea quarks. We use Asqtad-improved staggered light quarks and a Fermilab bottom quark on gauge configurations generated by the MILC Collaboration. We simulate with several light quark masses and at two lattice spacings, and extrapolate to the physical quark mass and continuum limit using heavy-light meson staggered chiral perturbation theory. We then fit the lattice result for f_+(q^2) simultaneously with that measured by the BABAR experiment using a parameterization of the form factor shape in q^2 which relies only on analyticity and unitarity in order to determine the CKM matrix element |V(ub)|. This approach reduces the total uncertainty in |V(ub)| by combining the lattice and experimental information in an optimal, model-independent manner. We find a value of |V(ub)| x 10^3 = 3.38 +/- 0.36.
The form factors for B -> pi l nu semileptonic decay from 2+1 flavors of domain-wall fermions
本文计算了晶格上畴壁轻夸克和相对论b夸克的B -> pi l nu形状因子。我们的工作与2+1味畴壁费米子和岩崎规范场合奏产生的RBC和UKQCD合作。手征连续谱外推采用SU(2)硬π手征微扰理论。为了将晶格形状因子外推到整个运动学范围,我们使用模型无关的z参数化,并在零动量转移处施加运动学约束f_+(0)= f_0(0)。
Semileptonic B to D decays at nonzero recoil with 2+1 flavors of improved staggered quarks. An update
费米实验室晶格和MILC合作正在完成一个关于MILC(2+1)风格asqtad合奏的综合性重光物理计划,晶格间距小至0.045 fm,光与奇异夸克质量比低至1/20。我们使用费米实验室的三叶草行动的重价夸克和asqtad行动的轻价夸克的解释。该计划的中心目标是提供CKM矩阵的酉性的更精确的测试。我们目前的初步结果的程序的一部分,即在非零反冲的半轻子衰变B -> D l nu的分析。
Semileptonic decays of K and D mesons in 2+1 flavor QCD
实验测量的半轻子衰变速率K -> pi l nu和D -> K(pi)l nu可以与相关形状因子的晶格计算相结合,以精确地提取CKM矩阵元|V_{us}|和|V_{cs(d)}|.本文报道了费米实验室用粲夸克和交错轻夸克在2+1味asqtad交错MILC系综上计算形状因子的情况。通过与CLEO数据的比较,对D -> pil nu形状因子的数据分析提供了对我们的方法的非平凡测试。本文讨论了用HISQ价夸克计算K -> pi l nu形状因子f_+^{K pi}(0)的方法,并描述了我们方法的检验。
$D$-meson semileptonic form factors at zero momentum transfer in (2+1+1)-flavor lattice QCD
我们提出了一个计算的$D\to K \ell ν$和$D\toπ\ell ν$半轻子形状因子在$q^2=0$,这使得确定的CKM矩阵元素$\lvert{V_{cs}}\rvert$和$\lvert{V_{cd}}\rvert$,分别。我们使用的规范场配置产生的MILC合作与四种口味的高度改进的交错(HISQ)夸克,分析几个合奏,包括那些物理介子质量和近似的晶格间距范围从0.12~fm到0.042~fm。对于价夸克,我们也使用了HISQ作用量。我们采用扭曲边界条件直接计算零动量转移时的形状因子。我们使用重轻介子手征微扰理论修正了高能π介子和K介子,并补充了描述晶格间距依赖性的项,得到了物理点和连续极限的初步结果.
Progress on charm semileptonic form factors from 2+1 flavor lattice QCD
对粲半轻子衰变D到K l nu和D到pi l nu的形状因子的格点计算为直接确定CKM矩阵元提供了输入|V(cs)|和|V(cd)|并且可以被设计为验证底部半轻子衰变B到pi l nu和B到Kl l-bar的形状因子的计算。我们在2+1味asqtad MILC系综上使用费米实验室的粲(底)夸克和asqtad交错轻夸克来计算粲(底)形状因子。我们概述了对以前计算魅力形状因子的改进,并详细说明了我们的进展。我们希望我们目前这一轮的数据生产,使我们能够减少理论上的不确定性,|V(cs)|和|V(cd)|分别从10.5%和11%降至约7%。
Puzzles in charmed baryon semileptonic decays with $SU(3)_F$ flavor symmetry and lattice inputs
School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, UCAS(杭州高等研究院基础物理与数学学院);Institute of Theoretical Physics, UCAS(理论物理研究所);University of Chinese Academy of Sciences(中国科学院大学)
Charm semileptonic decays and |V_{cs(d)}| from heavy clover quarks and 2+1 flavor asqtad staggered ensembles
将半轻子衰变D到K l nu和D到pi l nu的实验测量的部分分支分数与形状因子f_+^{D到K}(q^2)和f_+^{D到pi}(q^2)的晶格计算相结合,可以提取CKM矩阵元|V_{cs}|和|V_{cd}|.我们利用Fermilab的魅力和由MILC协作组产生的2+1味交错态的交错态光和奇异夸克计算了它们的形状因子。我们将轻价夸克质量从0.4m_s变化到0.05m_s(m_s是奇异海夸克质量),晶格间距从0.12fm变化到0.045fm。我们利用关于SU(2)和SU(3)极限的重轻介子交错手征微扰理论,外推到物理轻夸克质量和连续极限,将得到的(初步)形状因子形状与实验进行比较,并讨论了我们的误差。
Form factors of the $D_s \to ϕ\ell ν_\ell$ semileptonic decay with (2+1)-flavor lattice QCD
The CLQCD Collaboration(量子物质协同创新中心);School of Physics, Nanjing University(南京大学物理学院);Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所);School of Physics, Zhengzhou University(郑州大学物理学院);School of Physics, Peking University(北京大学物理学院);Center for High Energy Physics, Peking University(北京大学高能物理中心);Collaborative Innovation Center of Quantum Matter(量子物质协同创新中心);School of Physical Sciences, University of Chinese Academy of Sciences(中国科学院大学物理科学学院)
Study of the $D_s \to ϕ\ell ν_\ell$ semileptonic decay with (2+1)-flavor lattice QCD
Institute of High Energy Physics, Chinese Academy of Sciences(中国科学院高能物理研究所);School of Physics, Nanjing University(南京大学物理学院);School of Physics, Zhengzhou University(郑州大学物理学院);School of Physics, Peking University(北京大学物理学院);Center for High Energy Physics, Peking University(北京大学高能物理中心);Collaborative Innovation Center of Quantum Matter(量子物质协同创新中心);School of Physical Sciences, University of Chinese Academy of Sciences(中国科学院大学物理科学学院)