μ − ν̄ μ with a tt̄ production

/ 02 09 04 5 v 1 1 8 Se p 20 02 1 A Measurement of the τ − → μ − ν̄ μ ν τ Branching Ratio

Effect of Initial Particle Instability in Muon Collisions

We study μ+μ− collision with production of some state F (for example, F = W+) and (eν̄) system with the effective mass, which is less than muon mass. In this case the momentum k, transferred from μ to eν̄ system (virtual neutrino momentum), can be time–like. The path of integration over k2 goes through the pole at k2 = 0. It gives divergent cross section. This divergence disappears if the finite ...

ar X iv : h ep - p h / 05 06 11 1 v 2 1 4 Ju n 20 05 Transverse positron polarization in the μ + → e + ν̄ μ ν e decay in

ar X iv : h ep - p h / 05 06 11 1 v 1 1 1 Ju n 20 05 Transverse positron polarization in the μ + → e + ν̄ μ ν e decay in

Top Polarization at a μ + μ − Collider 1

The top quark pairs produced at a polarized muon collider are in a (nearly) pure spin configuration. This result holds for all center-of-mass energies, and is insensitive to the next-to-leading order QCD radiative corrections. The decay products of a polarized top quark show strong angular correlations. We describe an interesting interference effect between the left-handed and longitudinally po...