EPJ Web Conf.
Volume 175, 201835th International Symposium on Lattice Field Theory (Lattice 2017)
|Number of page(s)||8|
|Section||5 Hadron Spectroscopy and Interactions|
|Published online||26 March 2018|
ππ P-wave resonant scattering from lattice QCD
Computation-based Science and Technology Research Center, The Cyprus Institute, 20 Kavafi Str., Nicosia, 2121, Cyprus
2 Department of Physics, University of Cyprus, POB 20537, 1678 Nicosia, Cyprus
Department of Physics, University of Arizona, Tucson, AZ 85721, USA
4 RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, NY 11973, USA
5 Center for Theoretical Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA
6 Department of Mathematics and Natural Sciences, University of Wuppertal, D-42119 Wuppertal, Germany
7 Helmholtz-Institut für Strahlen-und Kernphysik, University of Bonn, D-53115 Bonn, Germany
8 Department of Physics and Astronomy, Stony Brook University, Stony Brook, NY 11794, USA
* Speaker, e-mail: firstname.lastname@example.org
Published online: 26 March 2018
We present a high-statistics analysis of the ρ resonance in ππ scattering, using 2 + 1 flavors of clover fermions at a pion mass of approximately 320 MeV and a lattice size of approximately 3:6 fm. The computation of the two-point functions are carried out using combinations of forward, sequential, and stochastic propagators. For the extraction of the ρ-resonance parameters, we compare different fit methods and demonstrate their consistency. For the ππ scattering phase shift, we consider different Breit-Wigner parametrizations and also investigate possible nonresonant contributions. We find that the minimal Breit-Wigner model is suffcient to describe our data, and obtain amρ = 0:4609(16)stat(14)sys and gρππ = 5:69(13)stat(16)sys. In our comparison with other lattice QCD results, we consider the dimensionless ratios amρ/amN and amπ/amN to avoid scale setting ambiguities.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (http://creativecommons.org/licenses/by/4.0/).
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