Topological susceptibility and η′ meson mass from Nf=2 lattice QCD at the physical point

被引：18

作者：

Dimopoulos, P. ^{[1
]}

Helmes, C. ^{[2
,3
]}

Jost, C. ^{[2
,3
]}

Knippschild, B. ^{[2
,3
]}

Kostrzewa, B. ^{[2
,3
]}

Liu, L. ^{[4
]}

Ottnad, K. ^{[2
,3
,5
]}

Petschlies, M. ^{[2
,3
]}

Urbach, C. ^{[2
,3
]}

Wenger, U. ^{[6
]}

Werner, M. ^{[2
,3
]}

机构：

[1] Univ Roma Tor Vergata, Dipartimento Fis, I-00133 Rome, Italy

[2] Rheinische Friedrich Wilhelms Univ Bonn, HISKP, D-53115 Bonn, Germany

[3] Rheinische Friedrich Wilhelms Univ Bonn, BCTP, D-53115 Bonn, Germany

[4] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Gansu, Peoples R China

[5] Johannes Gutenberg Univ Mainz, Inst Kernphys, Johann Joachim Becher Weg 45, D-55099 Mainz, Germany

[6] Univ Bern, Inst Theoret Phys, Albert Einstein Ctr Fundamental Phys, CH-3012 Bern, Switzerland

来源：

PHYSICAL REVIEW D | 2019年 / 99卷 / 03期

基金：

瑞士国家科学基金会;

关键词：

SPECTRUM;

D O I：

10.1103/PhysRevD.99.034511

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this paper we explore the computation of topological susceptibility and eta' meson mass in N-f = 2 flavor QCD using lattice techniques with a physical value of the pion mass as well as larger pion mass values. We observe that the physical point can be reached without a significant increase in the statistical noise. The mass of the eta' meson can be obtained from both fermionic two point functions and topological charge density correlation functions, giving compatible results. With the pion mass dependence of the eta' mass being flat we arrive at M eta' = 772(18) MeV without an explicit continuum limit. For the topological susceptibility we observe a linear dependence on M-2 pi, however, with an additional constant stemming from lattice artifacts.

引用

页数：13

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