The Λ(1405) pole structure from Lattice QCD: a coupled-channel πΣ - (K)over-barN study

被引：0
作者：
Bulava, John [1 ]
Cid-Mora, Barbara [2 ,3 ]
Hanlon, Andrew D. [4 ]
Hoerz, Ben [5 ]
Mohler, Daniel [2 ,3 ]
Morningstar, Colin [6 ]
Moscoso, Joseph [7 ]
Nicholson, Amy [7 ]
Romero-Lopez, Fernando [8 ]
Skinner, Sarah [7 ]
Walker-Loud, Andre [9 ]
机构：
[1] Ruhr Univ Bochum, Inst Theoret Phys 2, Fak Phys & Astron, D-44780 Bochum, Germany
[2] GSI Helmholtz Ctr Heavy Ion Res, Darmstadt, Germany
[3] Tech Univ Darmstadt, Inst Kernphys, Schlossgartenstr 2, D-64289 Darmstadt, Germany
[4] Brookhaven Natl Lab, Phys Dept, Upton, NY 11973 USA
[5] Intel Deutschland GmbH, Dornacher Str 1, D-85622 Feldkirchen, Germany
[6] Carnegie Mellon Univ, Dept Phys, Pittsburgh, PA 15213 USA
[7] Univ N Carolina, Dept Phys & Astron, Chapel Hill, NC 27516 USA
[8] MIT, Ctr Theoret Phys, Cambridge, MA 02139 USA
[9] Lawrence Berkeley Natl Lab, Nucl Sci Div, Berkeley, CA 94720 USA
来源：
16TH INTERNATIONAL CONFERENCE ON MESON-NUCLEON PHYSICS AND THE STRUCTURE OF THE NUCLEON, MENU 2023 | 2024年 / 303卷
基金：
美国国家科学基金会;
关键词：
CHIRAL DYNAMICS; BOUND-STATES; RESONANCES; SCATTERING;
D O I：
10.1051/epjconf/202430301004
中图分类号：
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号：
摘要：
This report summarizes results of the first lattice QCD calculation of coupled-channel pi Sigma - (K) over barN scattering in the Lambda(1405) region. This study was carried out using a single CLS ensemble with a heavier-than-physical pion mass m(pi) approximate to 200 MeV and a lighter-than-physical kaon mass m(K) approximate to 487 MeV. Once the finite-volume energy spectrum has been reliably extracted, the Luscher method was employed to obtain scattering amplitudes. Through a variety of parametrizations of the two-channel K-matrix, the final results show a virtual bound state below the pi Sigma threshold and a resonance right below (K) over barN.
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