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

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

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 02 06 6 v 1 7 Fe b 20 06 X ( 3872 ) in effective field theory

We consider the implications from the possibility that the recently observed state X(3872) is a meson-antimeson molecule. We write an effective Lagrangian consistent with the heavy-quark and chiral symmetries needed to describe X(3872) and study its properties.

ar X iv : h ep - p h / 06 02 19 2 v 1 2 1 Fe b 20 06 UT - 06 - 01 Minimal Supergravity , Inflation , and All That

We consider an inflationary model in the hidden-sector broken supergravity with an effectively large cutoff. The inflaton decay into right-handed neutrinos naturally causes the observed baryon asymmetry of the universe with a reheating temperature low enough to avoid the gravitino overproduction. We emphasize that all the phenomenological requirements from cosmology and particle physics are sat...

ar X iv : a st ro - p h / 06 02 51 3 v 1 2 3 Fe b 20 06 Jet deceleration : the case of PKS 1136 - 135