24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

Quark masses and strong coupling constant with Highly-Improved Staggered Quarks

26 Jul 2016, 14:00
20m
Building 67 Room 1007 (Highfield Campus, University of Southampton)

Building 67 Room 1007

Highfield Campus, University of Southampton

Highfield Campus, Southampton SO17 1BJ, UK
Talk Standard Model Parameters and Renormalization Standard Model Parameters and Renormalization

Speaker

Dr Yu Maezawa (YITP, Kyoto University)

Description

We present new results on the charm and bottom quark masses as well as the strong coupling constant in 2+1-flavor QCD using Highly Improved Staggered Quark action and gauge configurations generated by HotQCD Collaboration. Our approach is based on calculating the moments of meson correlators and we use a wide range of lattice spacing up to $a^{-1} \sim 4.9$ GeV in our study. The ratios of quark masses $m_c/m_s$ and $m_b/m_c$ are obtained from the combinations of the pseudo-scalar and vector meson masses and found to be $m_c/m_s=11.871(96)$ and $m_b/m_c=4.528(57)$ in the continuum limit. The lattice results of the hyper-fine splitting of the charmonium can reproduce the experimental value in the continuum. We also perform the determination of the strong coupling constant in the $\overline{\rm MS}$ scheme from the moments of pseudo-scalar charmonium correlators and find $\alpha_s(\mu=m_c)=0.3697(56)$, which is the determination of $\alpha_s$ at lowest energy scale so far. For the charm quark mass we obtain $m_c(\mu=m_c)=1.2668(10)$ GeV.

Primary author

Dr Yu Maezawa (YITP, Kyoto University)

Co-author

Dr Peter Petreczky (Brookhaven National Laboratory)

Presentation Materials