Computation of the HVP contribution to the muon anomaly with precise lattice spacing determination

by Dr Gen Wang (Aix-Marseille University)

Wednesday 18 Sept 2024, 10:00 → 12:00 Asia/Shanghai

5#/6th-603 - Meeting Room 603 (Science Building)

Abstract：

 I will present the latest calculation of HVP contributions to muon anomaly with Lattice QCD from Budapest-Marseille-Wuppertal collaboration (BMWc). The result leads to a prediction $714.1(2.2)(2.5)[3.3] \times 10^{-10}$ that differs from the experimental measurement of $a_\mu$ by only 0.9 standard deviations. This provides a remarkable validation of the standard model to 0.37 ppm. Since the largest systematic uncertainty comes from the ratio between the intrinsic QCD scale and fermion masses, we measure the precise Ω baryon mass in lattice units at seven lattice spacings down to $a\~0.048$ fm with $N_f=2+1+1$ staggered quarks, including QED and strong-isospin corrections. We perform these measurements by solving the Generalized Eigenvalue Problem, adapted to staggered fermions to fully resolve the negative parity and excited states. The most precise intrinsic QCD scale parameter $w_0=0.17245 (22)(46)[51]$ fm in the continuum limit at physical quark masses is determined using the physical Ω baryon mass, with unprecedented 0.3 percent precision.

 

Biography: 

王根毕业于美国肯塔基大学，现在艾克斯-马赛大学大学Budapest-Marseille-Wuppertal合作组下进行博士后研究。主要研究方向为强子结构的高精度格点计算，如缪子反常磁矩、质子自旋分解、标准模型参数测定等。

Host: Prof. Yifeng Sun 

Alternative online link:  https://meeting.tencent.com/dm/J2BRZVu7HWv2 (id: 803325618 passcode: 123456）