Threshold π0 photoproduction in relativistic chiral perturbation theory

被引：30
作者：
Hilt, M. [1 ]
Scherer, S. [1 ]
Tiator, L. [1 ]
机构：
[1] Johannes Gutenberg Univ Mainz, Inst Kernphys, PRISMA Cluster Excellence, D-55099 Mainz, Germany
来源：
PHYSICAL REVIEW C | 2013年 / 87卷 / 04期
关键词：
NEUTRAL-PION-PHOTOPRODUCTION; PRECISION CALCULATION; SCATTERING LENGTHS; PI(-)D SCATTERING; MASS DIFFERENCE; NEAR-THRESHOLD; SYMMETRY; NUCLEONS;
D O I：
10.1103/PhysRevC.87.045204
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We present a calculation of pi(0) photoproduction on the proton in manifestly Lorentz-invariant baryon chiral perturbation theory up to and including chiral order q(4). With the results we analyze the latest pi(0) photoproduction data in the threshold region obtained at the Mainz Microtron. In the calculation of observables and the fit of the low-energy constants, we take S, P, and D waves into account. We compare the results for the multipoles with the corresponding single-energy analysis. Furthermore, we also fit the O(q(4)) heavy-baryon chiral perturbation theory calculation and compare both results. We provide predictions for several polarization observables for future experiments. Finally, we discuss the beta parameter of the unitarity cusp which is related to the breaking of isospin symmetry. DOI: 10.1103/PhysRevC.87.045204
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页数：11
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