ar X iv : h ep - p h / 98 02 34 8 v 1 1 8 Fe b 19 98 The Non - perturbative Effect on R = σ L / σ T from QCD Vacuum ∗

ar X iv : h ep - p h / 98 02 41 9 v 1 2 5 Fe b 19 98 COURSE LARGE N QCD

ar X iv : h ep - p h / 98 02 28 9 v 1 1 0 Fe b 19 98 Constraints on the parameters of the V CKM matrix at the end of 1997

A review of the current status of the Cabibbo-Kobayashi-Maskawa matrix (VCKM) is presented. This paper contains an update of the results published in [1]. Values of the parameters entering into the constraints, which restrict the range for ρ and η parameters, include recent measurements given at 1997 Summer Conferences and progress obtained by lattice QCD collaborations. Experimental constraint...

ar X iv : h ep - p h / 98 01 34 9 v 3 1 2 Ju n 19 98 hep - ph / 9801349 Alberta Thy - 02 - 98 January , 1998 revised

CP-violating signals in weak Ξ → πΛ decay require the knowledge of πΛ Sand P-wave scattering phases at m Ξ center-of-mass energy. We have calculated these phases in baryon chiral perturbation theory with the ground-state Σ in s and u channels and 3 2 + Σ(1385) in the u channel. We do not treat the baryons as heavy. We find δ S = 1.2 • and δ P = −1.7 • with the central value of the strong coupli...

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

ar X iv : h ep - l at / 9 80 91 02 v 2 1 6 Se p 19 98 1 Phase structure of lattice QCD at finite temperature for 2 + 1 flavors of

We report on a study of the finite-temperature chiral transition on an Nt = 4 lattice for 2 + 1 flavors of Kogut-Susskind quarks. We find the point of physical quark masses to lie in the region of crossover, in agreement with results of previous studies. Results of a detailed examination of the m u,d = ms case indicate vanishing of the screening mass of σ meson at the end point of the first-ord...