ar X iv : h ep - p h / 04 02 14 7 v 1 1 3 Fe b 20 04 Contribution of dimension - six bosonic operators to H → γγ at one - loop level

ar X iv : h ep - p h / 04 02 14 7 v 2 1 J ul 2 00 4 Contribution of dimension - six bosonic operators to H → γγ at one - loop level

The decay process H → γγ is examined in a model-independent way within the effective Lagrangian approach. Contribution of a set of irreducible one-loop diagrams involving SU(2)×U(1) invariant dimension-six bosonic operators is evaluated explicitly. The calculation is intended to fill a gap that exists in the current literature on the subject. keywords: electroweak interactions; effective Lagran...

ar X iv : h ep - p h / 04 02 23 9 v 1 2 3 Fe b 20 04 The η → π 0 π 0 γγ decay in Generalized χ PT

Calculations of η → ππγγ decay in Generalized chiral perturbation theory are presented. Tree level and next-to-leading corrections are involved. Sensitivity to violation of the Standard counting is discussed.

ar X iv : h ep - p h / 04 02 19 0 v 1 1 8 Fe b 20 04 1 Pentaquarks in the 10 F - and 10 F - plets

ar X iv : h ep - p h / 04 02 14 5 v 1 1 3 Fe b 20 04 Automatic one - loop calculation of MSSM processes with GRACE

We have developed the system for the automatic computation of cross-sections, GRACE/SUSY , including the one-loop calculations for processes of the minimal supersymmetric extension of the the standard model. We discuss how to check our system for the one-loop calculations in comparison with the case for the tree-level calculations. For an application, we investigate the process e + e − → Z 0 h 0 .

ar X iv : h ep - p h / 04 02 29 2 v 1 2 7 Fe b 20 04 1 SU ( 3 ) Chiral Effective Field

A personal overview on the present status of SU(3) chiral perturbation theory in the baryonic sector is given. Recent developments are presented and remaining challenges are pointed out.