TY - JOUR
T1 - ππ P-wave resonant scattering from lattice QCD
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
N1 - Funding Information:
We thank Kostas Orginos for providing the gauge ensemble, which was generated with XSEDE resources supported by NSF grant number ACI-1053575. Our calculations were performed at NERSC, supported by the U.S. DOE under Contract No. DE-AC02-05CH11231. SM and GR are supported by NSF award number 1520996. SM and SS also thank the RIKEN BNL Research Center for support. JN was supported in part by the DOE Office of Nuclear Physics under grant DE-SC-0011090. AP was supported in part by the U.S. Department of Energy Office of Nuclear Physics under grant DE-FC02-06ER41444. S.P. is supported by the Horizon 2020 of the European Commission research and innovation programme under the Marie Sklodowska-Curie grant agreement No. 642069. We acknowledge the use of the USQCD software QLUA[27] and the underlying libraries.
Publisher Copyright:
© The Authors, published by EDP Sciences, 2018.
PY - 2018/3/26
Y1 - 2018/3/26
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.
UR - http://www.scopus.com/inward/record.url?scp=85045148152&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85045148152&partnerID=8YFLogxK
U2 - 10.1051/epjconf/201817505022
DO - 10.1051/epjconf/201817505022
M3 - Conference article
AN - SCOPUS:85045148152
SN - 2101-6275
VL - 175
JO - EPJ Web of Conferences
JF - EPJ Web of Conferences
M1 - 05022
T2 - 35th International Symposium on Lattice Field Theory, Lattice 2017
Y2 - 18 June 2017 through 24 June 2017
ER -