ar X iv : h ep - p h / 95 06 30 7 v 3 1 9 Ju n 19 95

ar X iv : h ep - p h / 95 06 44 3 v 1 2 7 Ju n 19 95 What Do We Know About the Tau Neutrino ?

In this talk I review the present bounds on the tau neutrino, concentrating on the possibility of bringing the mass bound below an MeV.

ar X iv : h ep - p h / 95 06 42 7 v 2 2 8 Ju n 19 95 Limits on Non - Commuting Extended Technicolor

Using precision electroweak data, we put limits on non-commuting extended technicolor models. We conclude that these models are viable only if the ETC-interactions are strong. Interestingly, these models predict a pattern of deviations from the standard model which can fit the data significantly better than the standard model does, even after taking into account the extra parameters involved.

ar X iv : h ep - p h / 97 06 36 3 v 1 1 6 Ju n 19 97 Interference in the reaction e + e − → γπ + π − and the final state interaction

ar X iv : h ep - p h / 95 06 32 0 v 1 1 3 Ju n 19

We introduce a way of implementing Wilson renormalization within the context of the theory of effective Hamiltonians. Our renormalization scheme involves manipulations at the level of the generalized G–matrix and is independent of any specific kinematics. We show how to calculate the beta function within this context and exhibit our method using simple scale–invariant quantum mechanical systems.

ar X iv : h ep - p h / 95 06 30 6 v 1 1 3 Ju n 19 95 Searching for B c mesons in the ATLAS experiment at LHC ∗

We discuss the feasibility of the observation of the signal from B c mesons in the ATLAS experiment of the LHC collider at a luminosity of ≈ 10 33 cm −2 s −1. In particular we address the decay mode B c →J/ψπ followed by the leptonic decay J/ψ→µ + µ − , which should permit an accurate measurement of the B c mass. We performed a Monte Carlo study of the signal and background concluding that a pr...