Conveners
Standard model parameters and renormalization
- Shoji Hashimoto (KEK)
Standard model parameters and renormalization
- Zhaofeng Liu (Institute of High Energy Physics)
Standard model parameters and renormalization
- Rainer Paul Sommer (DESY)
We present the current status of our determination of the charm quark mass using $N_\mathrm{f}=2+1$ dynamical, non-perturbatively $\mathrm{O}(a)$-improved Wilson fermions. A subset of CLS ensembles with four different lattice spacings along the $\mathrm{Tr}[M_q]=\mathrm{const.}$ trajectory is used.
For the computation of the correlation functions involving valence charm quark propagators we...
I present a determination of the strong coupling constant and heavy quark masses in (2+1)-flavor QCD using lattice calculations with Highly Improved Staggered Quark (HISQ) action and calculate the moments of the pseudo-scalar quarkonium correlators at several values of the heavy valence quark mass. I determine the strong coupling constant in $\overline{MS}$ scheme at four low energy scales...
In this contribution we present a preliminary data analysis of the pion, kaon and D-meson masses and decay constants, as well as preliminary results for light, strange and charm renormalized masses. The analysis is based on the gauge ensembles produced by ETMC with Nf=2+1+1 flavours of Wilson clover twisted mass quarks, which cover a range of lattice spacings from ~0.10 to 0.07 fm and include...
We show that the strong coupling can be accurately determined with the help of the running coupling in the pure gauge theory. We use a low energy scale computed in the three-flavor theory with heavy quarks, together with the non-perturbative running in pure gauge from 800 MeV to the electroweak scale to determine the three-flavor Lambda parameter accurately and in agreement with current...
We compute the coupling $\alpha_{qq}$ defined in terms
of the static quark force by simulating the SU(3) Yang Mills
theory at lattice spacings down to $10^{-2}$fm, keeping the
volume large. Open boundary conditions avoid the freezing
of topology. We can thus investigate the applicability of
perturbation theory, extract the pure gauge $\Lambda$-parameter
and compare to $\Lambda$ obtained...
As the only lattice vector current that does not require renormalisation is the point-split conserved current it is convenient to have a robust, precise and computationally cheap methodology for the calculation of vector current renormalisation factors, $Z_V$. Momentum subtraction schemes, such as RI-SMOM, implemented nonperturbatively on the lattice provide such a method if it can be shown...
We propose a renormalization scheme that can be simply implemented on the lattice. It consists of the temporal moments of two-point and three-point functions calculated with finite valence quark mass. The scheme is confirmed to yield a consistent result with another renormalization scheme in the continuum limit for the bilinear currents. We apply a similar renormalization scheme for the...
We construct a strategy to non-perturbatively convert Wilson coefficients in the four-flavor theory to those in the three-flavor theory. This non-perturbative matching is expected to reduce one of the biggest systematic uncertainties in RBC/UKQCD’s previous $K \to \pi\pi$ calculation, where the matching was performed perturbatively at scales below the charm threshold. Since our method uses...
We calculate the PCAC mass for $N_f=2+1$ flavor full QCD with Wilson fermion. We adopt the gradient flow method as a non-perturbative renormalization scheme. Our calculations are performed on two different mass parameters; heavy ud quark with $m_{\pi}/m_{\rho}\simeq0.63$ and almost physical s quark, and physical quarks. We compare the results with those renormalized with the Schrodinger...
We calculate the Kaon B parameter by using the Wilson type quark.
We adopt the gradient flow method as a non-perturbative renormalization scheme.
The calculation is performed on Nf=2+1 full QCD configuration generated with the Iwasaki gauge action and the non-perturbatively improved clover action.
We adopt a fine lattice spacing a=0.07 (fm).
The ud quark mass is rather heavy with...
We present our progress on the non-perturbative $\mathrm{O}(a)$ improvement and renormalization of tensor currents in three flavor lattice QCD with Wilson-clover fermions and tree-level Symanzik improved gauge action. While the $\mathrm{O}(a)$ improvement factor of the tensor currents is determined via a Ward identity approach, their RG group running is calculated via recursive finite-size...
We present a new strategy to extend the usual non-perturbative renormalization procedure, performed on the lattice in the RI'-MOM scheme, in order to include electromagnetic corrections at first order in perturbation theory. We show the first numerical estimates for the QED corrections to the renormalization constants of quark bilinears and four-fermion operators (two quarks and two leptons)....
