Phenomenological model for the ?? ? ?+?-?0 reaction

被引：2
|
作者：
Ren, Xiu-Lei [1 ,2 ,3 ]
Danilkin, Igor [1 ,2 ]
Vanderhaeghen, Marc [1 ,2 ]
机构：
[1] Johannes Gutenberg Univ Mainz, Inst Kernphys, D-55099 Mainz, Germany
[2] Johannes Gutenberg Univ Mainz, PRISMA Cluster Excellence, D-55099 Mainz, Germany
[3] Helmholtz Inst Mainz, D-55099 Mainz, Germany
来源：
PHYSICAL REVIEW D | 2023年 / 107卷 / 05期
关键词：
PARTIAL-WAVE ANALYSIS; PI-PI; DISPERSIVE ANALYSIS; GAMMA-ASTERISK; MUON; SCATTERING;
D O I：
10.1103/PhysRevD.107.054037
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present a phenomenological model for the gamma gamma -> pi+ pi- pi 0 reaction by including the production mechanism of the a2(1320) resonance, as well as the contributions from the sigma/f0(500)pi 0 and f2(1270)pi 0 production channels. Furthermore, the gamma gamma -> rho +/-pi -/+ -> pi+ pi- pi 0 channel, which is essential for a description in the low-energy region, is investigated carefully by introducing the complete set of gauge invariant and Lorentz-covariant tensors for the gamma gamma -> rho +/- pi -/+ subprocess. The full amplitude is constructed to yield a correct high-energy Regge behavior. Within our model, we achieve a very reasonable description of ARGUS and L3 data of the total cross section, as well as of the pi +/-pi 0 and pi+ pi- invariant mass distributions. We also predict the invariant mass distributions in the gamma gamma center-of-mass energy range from 0.8 to 2.0 GeV, which will be studied by the forthcoming data of the BESIII Collaboration.
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页数：12
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