ar X iv : h ep - p h / 04 02 07 9 v 2 2 7 Fe b 20 04 UH – 511 – 1043 – 04 LBL – 54494 February 2004

ar X iv : h ep - p h / 04 02 07 9 v 1 7 F eb 2 00 4 UH – 511 – 1043 – 04 LBL – 54494 February 2004

If the narrow exotic baryon resonances Θ+(1540) and Ξ 3 2 (1862) are members of the JP = 12 + antidecuplet with N∗(1710), the octet-antidecuplet mixing is required not only by the mass spectrum but also by the decay pattern of N∗(1710). This casts doubt on validity of the Θ+ mass prediction by the chiral soliton model. While all pieces of the existing experimental information point to a small o...

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.

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 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 14 7 v 1 1 3 Fe b 20 04 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 one-loop diagrams including 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 of the subject. [email protected] [email protected]