ar X iv : h ep - p h / 98 04 37 4 v 1 2 3 A pr 1 99 8 Towards a superformula for neutrinoless double beta decay †

ar X iv : h ep - p h / 98 04 40 7 v 1 2 6 A pr 1 99 8 B c → l ν̄γ DECAY IN LIGHT CONE QCD

X iv : h ep - p h / 98 04 44 0 v 1 2 8 A pr 1 99 8 CERN - TH / 98 - 139 ASPECTS OF M THEORY AND PHENOMENOLOGY

A brief review is presented of selected topics, including a world-sheet formulation of M theory, couplings and scales in M phenomenology, the perils of baryon decay and the possible elevation of free-fermion models to true M-or F-theory compactifications.

ar X iv : h ep - p h / 98 04 22 5 v 1 3 A pr 1 99 8 UAB – FT – 440 March 1998

I review the constraints on the mass of gravitinos that follow from considerations on energy loss in stars and from Big Bang Nucleosynthesis arguments.

ar X iv : h ep - p h / 98 12 52 8 v 1 3 0 D ec 1 99 8 On Prospects for Exploration of Supersymmetry in Double Beta Decay Experiments

We analyze constraints on the parameters of the R p violating su-persymmetry (R p / SUSY) which can be extracted from non-observation of the neutrinoless nuclear double beta decay (0νββ) at a given half-life lower bound. Our analysis covers a large class of phenomenolog-ically viable R p / SUSY models. We introduce special characteristics: the SUSY sensitivity of a ββ-decaying isotope and the S...

ar X iv : h ep - p h / 98 04 39 7 v 1 2 4 A pr 1 99 8 Quark and Gluon Orbital Angular Momentum and Spin in Hard Processes ∗

We suggest a method of constructing gauge invariant quark and gluon distributions that describe an abstract QCD observable and apply this method to analyze angular momentum of a hadron. In addition to the known quark and gluon polarized structure functions, we obtain gauge invariant distributions for quark and gluon orbital angular momenta, and consider some basic properties of these distributi...