Chiral study of the a0(980) resonance and πη scattering phase shifts in light of a recent lattice simulation

被引:46
作者
Guo, Zhi-Hui [1 ,2 ,3 ]
Liu, Liuming [2 ,3 ]
Meissner, Ulf-G. [2 ,3 ,4 ,5 ]
Oller, J. A. [6 ]
Rusetsky, A. [2 ,3 ]
机构
[1] Hebei Normal Univ, Dept Phys, Shijiazhuang 050024, Peoples R China
[2] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany
[3] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany
[4] Forschungszentrum Julich, Inst Kernphys, Inst Adv Simulat, D-52425 Julich, Germany
[5] Forschungszentrum Julich, Julich Ctr Hadron Phys, D-52425 Julich, Germany
[6] Univ Murcia, Dept Fis, E-30071 Murcia, Spain
基金
中国国家自然科学基金;
关键词
LARGE-N-C; PERTURBATION-THEORY; FINITE-VOLUME; KPI SCATTERING; AMPLITUDE ANALYSIS; MOMENTUM-TRANSFER; SCALAR RESONANCE; FORM-FACTORS; DYNAMICS; ISOSCALAR;
D O I
10.1103/PhysRevD.95.054004
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We investigate the a(0)(980) resonance within chiral effective field theory through a three-coupledchannel analysis, namely, pi eta, KK- , and pi eta('). A global fit to recent lattice finite-volume energy levels from pi eta scattering and relevant experimental data on a pi eta event distribution and the gamma gamma -> pi eta cross section is performed. Both the leading and next-to-leading-order analyses lead to similar and successful descriptions of the finite-volume energy levels and the experimental data. However, these two different analyses yield different pi eta scattering phase shifts for the physical masses for the pi, K,eta, and eta(') mesons. The inelasticities, the pole positions in the complex energy plane, and their residues are calculated both for unphysical and physical meson masses.
引用
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页数:22
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