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

Research output: Contribution to journalConference article

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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P waves
quantum chromodynamics
scattering
ambiguity
pions
phase shift
fermions
statistics
propagation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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

ππ P-wave resonant scattering from lattice QCD. / Paul, Srijit; Alexandrou, Constantia; Leskovec, Luka; Meinel, Stefan; Negele, John W.; Petschlies, Marcus; Pochinsky, Andrew; Rendon Suzuki, Jesus Gumaro; Syritsyn, Sergey.

In: EPJ Web of Conferences, Vol. 175, 05022, 26.03.2018.

Research output: Contribution to journalConference article

Paul, S, Alexandrou, C, Leskovec, L, Meinel, S, Negele, JW, Petschlies, M, Pochinsky, A, Rendon Suzuki, JG & Syritsyn, S 2018, 'ππ P-wave resonant scattering from lattice QCD', EPJ Web of Conferences, vol. 175, 05022. https://doi.org/10.1051/epjconf/201817505022
Paul S, Alexandrou C, Leskovec L, Meinel S, Negele JW, Petschlies M et al. ππ P-wave resonant scattering from lattice QCD. EPJ Web of Conferences. 2018 Mar 26;175. 05022. https://doi.org/10.1051/epjconf/201817505022
Paul, Srijit ; Alexandrou, Constantia ; Leskovec, Luka ; Meinel, Stefan ; Negele, John W. ; Petschlies, Marcus ; Pochinsky, Andrew ; Rendon Suzuki, Jesus Gumaro ; Syritsyn, Sergey. / ππ P-wave resonant scattering from lattice QCD. In: EPJ Web of Conferences. 2018 ; Vol. 175.
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AU - Paul, Srijit

AU - Alexandrou, Constantia

AU - Leskovec, Luka

AU - Meinel, Stefan

AU - Negele, John W.

AU - Petschlies, Marcus

AU - Pochinsky, Andrew

AU - Rendon Suzuki, Jesus Gumaro

AU - Syritsyn, Sergey

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N2 - 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.

AB - 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.

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