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Title: Elastic nucleon-pion scattering at mπ = 200 MeV from lattice QCD

Journal Article · · Nuclear Physics. B
 [1];  [2];  [3]; ORCiD logo [4];  [5];  [6];  [4];  [7];  [8]
  1. Deutsches Elektronen-Synchrotron (DESY), Zeuthen (Germany)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Intel Deutschland GmbH, Feldkirchen (Germany)
  4. Carnegie Mellon Univ., Pittsburgh, PA (United States)
  5. Univ. of North Carolina, Chapel Hill, NC (United States)
  6. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  7. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Elastic nucleon-pion scattering amplitudes are computed using lattice QCD on a single ensemble of gauge field configurations with Nf = 2 + 1 dynamical quark flavors and mπ = 200 MeV. The s-wave scattering lengths with both total isospins I = 1/2 and I = 3/2 are inferred from the finite-volume spectrum below the inelastic threshold together with the I = 3/2 p-wave containing the Δ(1232) resonance. The amplitudes are well-described by the effective range expansion with parameters constrained by fits to the finite-volume energy levels, enabling a determination of the I = 3/2 scattering length with statistical errors below 5%, while the I = 1/2 scattering length is somewhat less precisely evaluated. Systematic errors due to excited states and the influence of higher partial waves are controlled, providing a step toward future computations down to physical light quark masses with multiple lattice spacings and volumes.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR). Scientific Discovery through Advanced Computing (SciDAC); USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
SC0012704; AC02-05CH11231; AC52-07NA27344; PHY-1913158; PHY-2209167; SC0011090; SC0021006; PHY-2047185
OSTI ID:
1969924
Alternate ID(s):
OSTI ID: 2006762
Report Number(s):
BNL-224237-2023-JAAM; LLNL-JRNL-853698; TRN: US2313464
Journal Information:
Nuclear Physics. B, Vol. 987; ISSN 0550-3213
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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