M ay 1 99 6 Preprint UGI - 96 - 11 Submitted to Z . Phys . C Probing Hadronic Polarizations with Dilepton Anisotropies ∗

Probing Hadronic Polarizations with Dilepton Anisotropies

We investigate the production of e+e− pairs from p + Be and nucleus-nucleus collisions from 2 GeV/A to 200 GeV/A within a covariant transport approach and focus on the dilepton angular anisotropies as a function of the dilepton invariant mass. Whereas the low mass regime yields information about the Dalitz decays of the ∆, η and ω, above M ≈0.5 GeV the angular anisotropies provide additional in...

ar X iv : h ep - e x / 96 04 01 1 v 1 1 M ay 1 99 6 FACTORIZATION AND COLOR - SUPPRESSION IN HADRONIC B → D ( ∗ ) nπ DECAYS Jorge

v 1 1 2 A ug 1 99 6 SUNY - NTG - 96 - 16 Dilepton / photon production in heavy ion collisions , and the QCD phase transition

We calculate electromagnetic production from highly excited hadronic matter created in heavy ion collisions. The rates include the usual lowest order processes in quark-gluon plasma plus the usual reactions in the hadronic phase, related with ρ, a 1 mesons. The space-time integration is done using a hydrodynamical model. We have found that dilepton mass spectrum agrees with results of other pre...

A ug 1 99 6 SUNY - NTG - 96 - 16 Dilepton / photon production in heavy ion collisions , and the QCD phase transition

We calculate electromagnetic production from highly excited hadronic matter created in heavy ion collisions. The rates include the usual lowest order processes in quark-gluon plasma plus the usual reactions in the hadronic phase, related with ρ, a 1 mesons. The space-time integration is done using a hydrodynamical model. We have found that dilepton mass spectrum agrees with results of other pre...

ar X iv : h ep - p h / 96 07 38 9 v 1 2 2 Ju l 1 99 6 B → X s τ + τ − in a two Higgs doublet model

The inclusive rate and forward-backward asymmetry of dilepton angular distribution for a B-meson to decay to strange hadronic final states and a ττ pair in a two Higgs doublet model are computed. In particular, contributions of neutral Higgs bosons to the decay are included. QCD corrections to the effective Hamiltonian for B → Xsττ are calculated using the leading logarithmic approximation.