Resonances in coupled πK, ηK scattering from lattice QCD

Wilson, David J.; Dudek, Jozef J.; Edwards, Robert G.; Thomas, Christopher E.

doi:10.1103/PhysRevD.91.054008

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

Journal Article · Tue Mar 10 00:00:00 EDT 2015 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.91.054008· OSTI ID:1172178

Wilson, David J. ^[1]; Dudek, Jozef J. ^[2]; Edwards, Robert G. ^[3]; Thomas, Christopher E. ^[4]

Old Dominion Univ., Norfolk, VA (United States)
Old Dominion Univ., Norfolk, VA (United States); Jefferson Lab, Newport News, VA (United States)
Jefferson Lab, Newport News, VA (United States)
Univ. of Cambridge (United Kingdom)

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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Contributing Organization:: Hadron Spectrum Collaboration

Grant/Contract Number:: AC05-06OR23177; SC0006765

OSTI ID:: 1172178

Alternate ID(s):: OSTI ID: 1181044

Report Number(s):: JLAB-THY-14-1892; DOE/OR/23177-3087; arXiv:1411.2004; PRVDAQ; ArticleNumber: 054008; DE-SC0006765; TRN: US1600839

Journal Information:: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 91, Issue 5; ISSN 1550-7998

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 110 works

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