ar X iv : h ep - p h / 06 02 21 5 v 2 2 7 M ay 2 00 6 IPPP / 06 / 10 DCPT / 06 / 20 22 nd February 2006 Leading neutron spectra

ar X iv : h ep - p h / 06 02 21 5 v 1 2 3 Fe b 20 06 IPPP / 06 / 10 DCPT / 06 / 20 22 nd February 2006 Leading neutron spectra

It is shown that the observation of the spectra of leading neutrons from proton beams can be a good probe of absorptive and migration effects. We quantify how these effects modify the Reggeized pion-exchange description of the measurements of leading neutrons at HERA. We are able to obtain a satisfactory description of all the features of these data. We also briefly discuss the corresponding da...

ar X iv : h ep - p h / 06 06 21 3 v 1 20 J un 2 00 6

In principle, leading neutrons produced in photoproduction and deep-inelastic scattering at HERA have the potential to determine the pion structure function, the neutron absorptive cross section and the form of the pion flux. To explore this potential we compare theoretical predictions for the xL and pt spectra of leading neutrons, and the Q 2 dependence of the cross section, with the existing ...

ar X iv : h ep - p h / 06 05 26 3 v 2 3 1 M ay 2 00 6 Baryogenesis by R - parity violating top quark decays and neutron - antineutron oscillations

Generation of the cosmological baryon asymmetry in SUSY based model with broken R-parity and low scale gravity is considered. The model allows for a long-life time or even stable proton and observable neutron-antineutron oscillations.

ar X iv : h ep - p h / 06 05 13 6 v 1 1 1 M ay 2 00 6 Lepton Flavor Violating τ and μ decays

ar X iv : h ep - p h / 06 07 13 9 v 1 1 2 Ju l 2 00 6 IPPP /

We use twistor inspired rules to compute the one-loop amplitude for a Higgs boson coupling to any number of negative helicity gluons in the large top mass limit.