December 1992 arXiv papers — page 5

M. Ciuchini, E. Franco, G. Martinelli, L. Reina

We present a new calculation of the CP violation parameter $ε^{\prime}/ ε$. The results reported in this paper have been obtained by using the $ΔS=1$ effective Hamiltonian computed at the next-to-leading order, including QCD and QED penguins. The matrix elements of the relevant operators have been taken from lattice QCD, at a scale $μ=2$ GeV. At this relativ

Huazhong Zhang

This is a brief review on the work done recently. It is shown that the global constraints of Gauss' law ensure that the vacuum angle must be quantized in gauge theories with magnetic monopoles. Our quantization rule is given as $θ=0$, or $θ=2πN/n~ (n\neq 0)$ with integer n being the relevant topological charge of the magnetic monopole and N is an unfixed

Sally Dawson

We discuss the ${\cal O}(α_s)$ QCD radiative corrections to Higgs boson production in the limit in which the top quark is much heavier than the Higgs boson. The subleading corrections, of ${\cal O} (α_s M_H^2/M_{\rm top}^2)$, are presented for the decay $H\rightarrow γγ$ and shown to be small.

Koichi Yamawaki

We explain general features of the tightly bound composite Higgs models proposed in recent years; walking technicolor, strong ETC technicolor, and a top quark condensate, etc.. These models are all characterized by the large anomalous dimension due to nontrivial short distance dynamics in the gauged Nambu-Jona-Lasinio models (gauge theories plus four-fermion

Pankaj Jain, Douglas W. McKay, Herman J. Munczek

We present a nonperturbative analysis of the top quark propagator using the Schwinger Dyson equation in the ladder approximation including both the electroweak as well as the infrared QCD effects. We find that the infrared effects are negligible only for top mass larger than about 250 GeV.

Pankaj Jain, John P. Ralston

We argue that the experimentally measured color transparency ratio is directly related to the interacting hadron wave function at small transverse separation, $b^2<1/Q^2$. We show that the present experimental data is consistent with pure scaling behavior of the hadron-hadron and lepton-hadron scattering inside the nuclear medium.

Wolfgang Bock, Asit K. De, Erich Focht, Jan Smit

Quenched studies of a global U(1) symmetric Wilson-Yukawa model in two dimensions show no evidence of a charged fermion in the vortex phase at strong Wilson-Yukawa coupling while there is strong indication of a massive neutral fermion. However, with the U(1)$_L$ gauge field turned on, we use dimensional arguments to suggest that the neutral fermion appears t