The ρ-resonance from Nf=2 lattice QCD including the physical pion mass

被引：18

作者：

Fischer, Matthias ^{[1
,2
]}

Kostrzewa, Bartosz ^{[3
]}

Mai, Maxim ^{[4
]}

Petschlies, Marcus ^{[1
,2
]}

Pittler, Ferenc ^{[5
]}

Ueding, Martin ^{[1
,2
]}

Urbach, Carsten ^{[1
,2
]}

Werner, Markus ^{[1
,2
]}

机构：

[1] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, Nussallee 14-16, D-53115 Bonn, Germany

[2] Univ Bonn, Bethe Ctr Theoret Phys, Nussallee 12, D-53115 Bonn, Germany

[3] Univ Bonn, High Performance Comp & Analyt Lab, Friedrich Hirzebruch Allee 8, D-53115 Bonn, Germany

[4] George Washington Univ, Washington, DC 20052 USA

[5] Cyprus Inst, Computat Based Sci & Technol Res Ctr, 20 Kavafi Str, CY-2121 Nicosia, Cyprus

来源：

PHYSICS LETTERS B | 2021年 / 819卷

关键词：

CHIRAL PERTURBATION-THEORY; QUANTUM-FIELD THEORIES; LIGHT QUARKS; AMPLITUDE;

D O I：

10.1016/j.physletb.2021.136449

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a lattice computation of pi pi-scattering in the I = 1 channel with N-f = 2 dynamical quark flavours obtained with ensembles bracketing the physical value of the pion mass. Employing a global fit to data at three values of the pion mass, we determine the universal parameters of the rho-resonance. We carefully investigate systematic uncertainties by determining energy eigenvalues using different methods and by comparing inverse amplitude method and Breit-Wigner type parametrizations. Overall, exploring the complex energy plane we find mass M-rho = 786(22) MeV and width Gamma(rho) = 180(6) MeV, including statistical and systematic uncertainties. In contrast to previous N-f = 2 extrapolations from higher than physical pion mass results, our mass value is in good agreement with experiment, while the width is too high. (C) 2021 The Author(s). Published by Elsevier B.V.

引用

页数：7

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