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Title: Resonances in coupled πK, ηK scattering from lattice QCD

Coupled-channel πK and ηK scattering amplitudes are determined by studying the finite-volume energy spectra obtained from dynamical lattice QCD calculations. Using a large basis of interpolating operators, including both those resembling a qq-bar construction and those resembling a pair of mesons with relative momentum, a reliable excited-state spectrum can be obtained. Working at mπ = 391 MeV, we find a gradual increase in the JP = 0+ πK phase-shift which may be identified with a broad scalar resonance that couples strongly to πK and weakly to ηK. The low-energy behavior of this amplitude suggests a virtual bound-state that may be related to the κ resonance. A bound state with JP = 1- is found very close to the πK threshold energy, whose coupling to the πK channel is compatible with that of the experimental K*(892). Evidence is found for a narrow resonance in JP = 2+. Isospin–3/2 πK scattering is also studied and non-resonant phase-shifts spanning the whole elastic scattering region are obtained.
 [1] ;  [2] ;  [3] ;  [4]
  1. Old Dominion Univ., Norfolk, VA (United States)
  2. Old Dominion Univ., Norfolk, VA (United States); Jefferson Lab, Newport News, VA (United States)
  3. Jefferson Lab, Newport News, VA (United States)
  4. Univ. of Cambridge (United Kingdom)
Publication Date:
OSTI Identifier:
Report Number(s):
JLAB-THY-14-1892; DOE/OR/23177-3087; arXiv:1411.2004
Journal ID: ISSN 1550-7998; PRVDAQ; ArticleNumber: 054008; DE-SC0006765; TRN: US1600839
Grant/Contract Number:
Accepted Manuscript
Journal Name:
Physical Review. D, Particles, Fields, Gravitation and Cosmology
Additional Journal Information:
Journal Volume: 91; Journal Issue: 5; Journal ID: ISSN 1550-7998
American Physical Society (APS)
Research Org:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
Contributing Orgs:
Hadron Spectrum Collaboration
Country of Publication:
United States