ar X iv : h ep - p h / 05 02 01 2 v 1 1 Fe b 20 05

ar X iv : h ep - t h / 05 02 11 7 v 1 1 3 Fe b 20 05 hep - th / 0502117 ITP – UH – 02 / 05 Noncommutative Instantons in 4 k Dimensions

We consider Ward’s generalized self-duality equations for U(2r) Yang-Mills theory on R and their Moyal deformation under self-dual noncommutativity. Employing an extended ADHM construction we find two kinds of explicit solutions, which generalize the ’t Hooft and BPST instantons from R to noncommutative R. The BPST-type configurations appear to be new even in the commutative case.

ar X iv : h ep - p h / 02 05 01 6 v 1 2 M ay 2 00 2 Scalar a 0 ( 980 ) meson in φ → π 0 ηγ decay

ar X iv : h ep - t h / 05 02 14 4 v 1 1 6 Fe b 20 05 Newton ’ s law in an effective non commutative space - time

The Newtonian Potential is computed exactly in a theory that is fundamentally Non Commutative in the space-time coordinates. When the dispersion for the distribution of the source is minimal (i.e. it is equal to the non commutative parameter θ), the behavior for large and small distances is analyzed. PACS number: 11.10.Nx

ar X iv : h ep - p h / 05 02 17 9 v 1 1 9 Fe b 20 05 Search for the vector - like top quark T at the future linac - ring type ep collider

The little Higgs models typically contain a new vector-like top quark T , which plays a key role in breaking the electroweak symmetry. In the context of the littlest Higgs (LH) model, we study single production of this kind of new particle via the process ep → eb → νeT in the future linac-ring type ep collider (LC ⊗ LHC). We find that the production cross section is in the range of 1.2× 10— 0.4...

ar X iv : h ep - p h / 06 03 00 1 v 1 2 8 Fe b 20 06 NuFact 05 Working Group 2 Summary : Experimental Results in Neutrino Scattering Physics

This paper summarizes the experimental results in neutrino scattering physics as presented in Working Group 2. A summary of the theoretical results is presented in [1].

X iv : h ep - p h / 05 02 12 2 v 1 1 4 Fe b 20 05 OPE coefficient functions in terms of composite operators only . Nonsinglet case

A new method for calculating the coefficient functions of the operator product expansion is proposed which does not depend explicitly on elementary fields. Coefficient functions are defined entirely in terms of composite operators. The method is illustrated in the case of QCD nonsinglet operators.