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

Dimopoulos, P.; Helmes, C.; Jost, C.; Knippschild, B.; Kostrzewa, B.; Liu, L.; Ottnad, K.; Petschlies, M.; Urbach, C.; Wenger, Urs; Werner, M. (2019). Topological susceptibility and η′ meson mass from Nf = 2 lattice QCD at the physical point. Physical review. D - particles, fields, gravitation, and cosmology, 99(3) American Physical Society 10.1103/PhysRevD.99.034511

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In this paper we explore the computation of topological susceptibility and η' meson mass in Nf = 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 η' 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 η' mass being flat we arrive at Mη' = 772(18) MeV without an explicit continuum limit. For the topological susceptibility we observe a linear dependence on M²π, however, with an additional constant stemming from lattice artifacts.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Institute of Theoretical Physics

UniBE Contributor:

Wenger, Urs

Subjects:

500 Science > 530 Physics

ISSN:

1550-7998

Publisher:

American Physical Society

Language:

English

Submitter:

Esther Fiechter

Date Deposited:

13 May 2019 12:14

Last Modified:

24 Oct 2019 07:18

Publisher DOI:

10.1103/PhysRevD.99.034511

ArXiv ID:

1812.08787

BORIS DOI:

10.7892/boris.127960

URI:

https://boris.unibe.ch/id/eprint/127960

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