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Lattice QCD calculations of baryon forces are performed for the first time with (almost) physical quark masses. $N_f = 2+1$ dynamical clover fermion gauge configurations are generated at the lattice spacing of $a \simeq 0.085$ fm on a $(96…

The principles of scale setting in lattice QCD as well as the advantages and disadvantages of various commonly used scales are discussed. After listing criteria for good scales, I concentrate on the main presently used ones with an emphasis…

High Energy Physics - Lattice · Physics 2014-01-15 Rainer Sommer

Recent lattice results on the meson and baryon spectrum with a focus on the determination of hadronic resonance masses and widths using a combined basis of single-hadron and hadron-hadron interpolating fields are reviewed. These mostly…

High Energy Physics - Lattice · Physics 2017-04-05 Daniel Mohler

We introduce a new numerical technique to compute mass spectra, based on difference method and on a new gauge fixing procedure. We show that the method is very effective by test runs on a $SU(2)$ lattice gauge theory.

High Energy Physics - Lattice · Physics 2009-10-28 E. Marinari , M. L. Paciello , G. Parisi , B. Taglienti

This letter reports on a new procedure for the lattice spacing setting that takes advantage of the very precise determination of the strong coupling in Taylor scheme. Although it can be applied for the physical scale setting with the…

High Energy Physics - Lattice · Physics 2014-03-05 B. Blossier , Ph. Boucaud , M. Brinet , F. De Soto , V. Morènas , O. Pène , K. Petrov , J. Rodríguez-Quintero

We determine the axial, scalar and tensor isovector charges of the nucleon, sigma and cascade baryons as well as the difference between the up and down quark masses, $m_u-m_d$. We employ gauge ensembles with $N_f=2+1$ non-perturbatively…

High Energy Physics - Lattice · Physics 2023-09-01 Gunnar S. Bali , Sara Collins , Simon Heybrock , Marius Löffler , Rudolf Rödl , Wolfgang Söldner , Simon Weishäupl

We determine the masses, the singlet and octet decay constants as well as the anomalous matrix elements of the $\eta$ and $\eta^\prime$ mesons in $N_f=2+1$ QCD\@. The results are obtained using twenty-one CLS ensembles of non-perturbatively…

High Energy Physics - Lattice · Physics 2021-08-27 Gunnar S. Bali , Vladimir Braun , Sara Collins , Andreas Schäfer , Jakob Simeth

We give a brief report on the basic properties and cutoff scale of our new configuration set (HAL-Conf-2023). We generated 8,000 trajectories of the gauge configurations on $96^4$ lattices with the same lattice parameters as the PACS…

High Energy Physics - Lattice · Physics 2023-11-28 Etsuko Itou for HAL QCD collaboration

While electromagnetic and up-down quark mass difference effects on octet baryon masses are very small, they have important consequences. The stability of the hydrogen atom against beta decay is a prominent example. Here we include these…

High Energy Physics - Lattice · Physics 2014-01-07 Sz. Borsanyi , S. Dürr , Z. Fodor , J. Frison , C. Hoelbling , S. D. Katz , S. Krieg , Th. Kurth , L. Lellouch , Th. Lippert , A. Portelli , A. Ramos , A. Sastre , K. Szabo

In our recent analysis of lattice data of the BMW, LHPC and PACS-CS groups we determined a parameter set of the chiral Lagrangian that allows a simultaneous description of the baryon octet and decuplet masses as measured by those lattice…

High Energy Physics - Lattice · Physics 2015-06-11 M. F. M. Lutz , A. Semke

A method for computing electromagnetic properties of hadrons in lattice QCD is applied to the extraction of electromagnetic properties of the octet baryons. This allows a determination of the full dependence of the baryon masses on the…

High Energy Physics - Lattice · Physics 2009-10-28 A. Duncan , E. Eichten , H. Thacker

A novel method to calculate f_B on the lattice is introduced, based on the study of the dependence of finite size effects upon the heavy quark mass of flavoured mesons and on a non-perturbative recursive finite size technique. We avoid the…

High Energy Physics - Lattice · Physics 2009-11-07 M. Guagnelli , F. Palombi , R. Petronzio , N. Tantalo

The baryon masses on CLS ensembles are used to determine the LEC that characterize QCD in the flavor-SU(3) limit with vanishing up, down, and strange quark masses. Here we reevaluate some of the baryon masses on flavor-symmetric ensembles…

High Energy Physics - Lattice · Physics 2024-10-16 Matthias F. M. Lutz , Yonggoo Heo , Renwick J. Hudspith

We present results on the masses of the low-lying baryons using ten ensembles of gauge configurations with $N_f =2+1+1$ dynamical twisted mass fermions, at three values of the lattice spacing, spanning a pion mass range from about 210 MeV…

High Energy Physics - Lattice · Physics 2014-12-03 C. Alexandrou , V. Drach , K. Hadjiyiannakou , K. Jansen , C. Kallidonis , G. Koutsou

Meson and baryon masses in the light (u,d and s) sector are calculated using tadpole-improved gauge field and fermion actions. These are corrected to order $O(a^2)$ on the classical level using next-nearest-neighbour terms. The results,…

High Energy Physics - Lattice · Physics 2009-10-28 H. R. Fiebig , R. M. Woloshyn

We investigate the low-lying baryon spectrum using three $N_f$=2+1+1 ensembles simulated with physical values of the quark masses and lattice spacings of 0.080, 0.069, and 0.057 fm. The ensembles are generated using twisted mass…

High Energy Physics - Lattice · Physics 2024-01-10 Constantia Alexandrou , Simone Bacchio , Georgios Christou , Jacob Finkenrath

The mass spectrum of heavy quark baryons has been computed on anisotropic lattices using quenched lattice nonrelativistic QCD. The mass splittings between spin-1/2 and spin-3/2 baryons are also calculated. Results are compared to those…

High Energy Physics - Lattice · Physics 2007-05-23 Nilmani Mathur , Randy Lewis , R. M. Woloshyn

Scale setting is of central importance in lattice QCD. It is required to predict dimensional quantities in physical units. Moreover, it determines the relative lattice spacings of computations performed at different values of the bare…

High Energy Physics - Lattice · Physics 2012-11-06 S. Borsanyi , S. Durr , Z. Fodor , C. Hoelbling , S. D. Katz , S. Krieg , T. Kurth , L. Lellouch , T. Lippert , C. McNeile , K. K. Szabo

In this report, the most recent and precise estimates of masses of ground state baryons using lattice QCD are discussed. Considering the prospects in the heavy baryon sector, lattice estimates for these are emphasized. The first and only…

High Energy Physics - Lattice · Physics 2019-05-27 M. Padmanath

We report on the first lattice determination of the pseudoscalar meson $\eta_c$ light-cone distribution amplitude, using a set of three CLS $N_f=2$ ensembles at a pion mass $m_{\pi} \sim 270~\text{MeV}$ and lattice spacings $a \sim…

High Energy Physics - Lattice · Physics 2023-11-21 Miguel Teseo San José Pérez , Benoît Blossier , Mariane Mangin-Brinet , José Manuel Morgado Chávez