Tuning Fermilab Heavy Quarks in 2+1 Flavor Lattice QCD with Application to Hyperfine Splittings
C. Bernard, C. DeTar, M. Di Pierro, A. X. El-Khadra, R. T. Evans, E. D. Freeland, E. Gámiz, Steven Gottlieb, U. M. Heller, J. E. Hetrick, A. S. Kronfeld, J. Lai… 展开作者
C. Bernard, C. DeTar, M. Di Pierro, A. X. El-Khadra, R. T. Evans, E. D. Freeland, E. Gámiz, Steven Gottlieb, U. M. Heller, J. E. Hetrick, A. S. Kronfeld, J. Laiho, L. Levkova, P. B. Mackenzie, J. N. Simone, R. Sugar, D. Toussaint, R. S. Van de Water
备注:
34 pages, 8 figures, 26 tables; some sections rearranged for clarity; conclusions unchanged; version accepted by Phys. Rev.D
We report the non-perturbative tuning of parameters--- kappa_c, kappa_b, and kappa_crit ---that determine the heavy-quark mass in the Fermilab action. This requires the computation of the masses of Ds^(*) and Bs^(*) mesons comprised of a Fermilab heavy quark and a staggered light quark. Additionally, we report the hyperfine splittings for Ds and Bs mesons as a cross-check of our simulation and analysis methods. We find a splitting of 145 +/- 15 MeV for the Ds system and 40 +/- 9 MeV for the Bs system. These are in good agreement with the Particle Data Group average values of 143.9 +/- 0.4 MeV and 46.1 +/- 1.5 MeV, respectively. The calculations are carried out with the MILC 2+1 flavor gauge configurations at three lattice spacings $a$ approximately 0.15, 0.12, and 0.09 fm.
Untangling the heavy-flavor mess: status of the Fermilab-MILC calculation of the $B_{(s)}\to D^{(\ast)}_{(s)}\ellν$ form factors
Universidad de Zaragoza(萨拉戈萨大学);University of Utah(犹他大学);University of Illinois Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);Illinois Center for Advanced Studies of the Universe, University of Illinois Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校宇宙高级研究中心);Indiana University(印第安纳大学);Colorado State University(科罗拉多州立大学);Fermi National Accelerator Laboratory(费米国家加速器实验室)
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。
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。
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%。
Colorado State University(科罗拉多州立大学);University of Illinois Urbana-Champaign(伊利诺伊大学厄巴纳-香槟分校);University of Illinois(伊利诺伊大学);University of Utah(犹他大学);Indiana University(印第安纳大学);Fermi National Accelerator Laboratory(费米国家加速器实验室);Syracuse University(雪城大学);Universidad de Zaragoza(萨拉戈萨大学)
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。