• Open Access

Extraction of isoscalar ππ phase shifts from lattice QCD

D. Guo, A. Alexandru, R. Molina, M. Mai, and M. Döring
Phys. Rev. D 98, 014507 – Published 12 July 2018

Abstract

We conduct a two-flavor (Nf=2) lattice QCD calculation of the elastic phase shifts for pion-pion scattering in the scalar, isoscalar channel (the σ-meson). The calculation is performed for two quark masses corresponding to pion masses of 315 and 227 MeV. The σ-meson parameters are extracted using various parametrizations of the scattering amplitude. The results obtained from a chiral unitary parametrization are extrapolated to the physical point and read Mσ=(44016+10(50)i240(20)(25))MeV, where the uncertainties in the parentheses denote the stochastic and systematic ones. The behavior of the σ-meson parameters with increasing pion mass is discussed as well.

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  • Received 15 March 2018

DOI:https://doi.org/10.1103/PhysRevD.98.014507

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Particles & FieldsNuclear Physics

Authors & Affiliations

D. Guo1,*, A. Alexandru1,2,3,†, R. Molina4,‡, M. Mai1,§, and M. Döring1,5,∥

  • 1The George Washington University, Washington, DC 20052, USA
  • 2Department of Physics, University of Maryland, College Park, Maryland 20742, USA
  • 3Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland
  • 4Institute of Physics of the University of São Paulo, Rua do Matão, 1371, Butantã, São Paulo 05508-090, Brazil
  • 5Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA

  • *guodehua@gwmail.gwu.edu
  • aalexan@gwu.edu
  • ramope@if.usp.br
  • §maximmai@gwu.edu
  • doring@gwu.edu

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Vol. 98, Iss. 1 — 1 July 2018

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