LOW-ENERGY PHOTON-PHOTON COLLISIONS TO 2-LOOP ORDER

被引：136

作者：

BELLUCCI, S

GASSER, J

SAINIO, ME

机构：

[1] PAUL SCHERRER INST,CH-5232 VILLIGEN PSI,SWITZERLAND

[2] UNIV BERN,INST THEORET PHYS,CH-3012 BERN,SWITZERLAND

来源：

NUCLEAR PHYSICS B | 1994年 / 423卷 / 01期

关键词：

D O I：

10.1016/0550-3213(94)90566-5

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：

We evaluate the amplitude for gammagamma --> pi0pi0 to two loops in chiral perturbation theory. The three new counterterms which enter at this order in the low-energy expansion are estimated with resonance saturation. We find that the cross section agrees rather well with the available data and with dispersion theoretic calculations even substantially above threshold. Numerical results for the Compton cross section and for the neutral pion polarizabilities are also given to two-loop accuracy.

引用

页码：80 / 122

页数：43

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