ππ P-wave resonant scattering from lattice QCD

Srijit Paul, Constantia Alexandrou, Luka Leskovec, Stefan Meinel, John W. Negele, Marcus Petschlies, Andrew Pochinsky, Jesus Gumaro Rendon Suzuki, Sergey Syritsyn

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Abstract

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.

Original languageEnglish (US)
Article number05022
JournalEPJ Web of Conferences
Volume175
DOIs
StatePublished - Mar 26 2018
Event35th International Symposium on Lattice Field Theory, Lattice 2017 - Granada, Spain
Duration: Jun 18 2017Jun 24 2017

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Paul, S., Alexandrou, C., Leskovec, L., Meinel, S., Negele, J. W., Petschlies, M., Pochinsky, A., Rendon Suzuki, J. G., & Syritsyn, S. (2018). ππ P-wave resonant scattering from lattice QCD. EPJ Web of Conferences, 175, [05022]. https://doi.org/10.1051/epjconf/201817505022