Bloch-Nordsieck regularization of QCD transverse-momentum distributions.
An expression for transverse-momentum distributions is presented for Drell-Yan-type processes: it is infrared finite, includes soft-gluon summation in the leading-logarithmic approximation and reproduces the first-order perturbative results at large {ital p}{sub {ital T}}. In addition, our expression incorporates soft QCD radiative corrections to that part of the cross section where hard bremsstrahlung dominates. We compute {ital W} transverse-momentum distributions and average values for a set of different energies: {radical}{ital s} =630 GeV, 1.8 TeV, 6 TeV, and 18 TeV.

title: Two-time correlation functions:
stochastic and conventional quantum mechanics

abstract: An investigation of two-time correlation functions is reported
within the framework of (i) stochastic quantum mechanics and (ii)
conventional Heisenberg-Schrödinger quantum mechanics. The
spectral functions associated with the two-time electric dipole moment
correlation functions are worked out in detail for the case of the
hydrogen atom. While the single time averages are identical for
stochastic and conventional quantum mechanics, differences arise in
the two approaches for multiple time correlation functions.

title: Vacuum spin waves through the chiral anomaly
abstract: It is shown that the quantum electrodynamic chiral anomaly generates “spin waves” in the vacuum, when a low-energy electromagnetic field is applied. Such spin waves are (in principle) observable in a vacuum region with a condensed matter boundary surface which has a finite Hall conductance.

title: Modeling Pion and Nucleon Total Cross-sections
abstract: With an eye towards proposed experiments at the LHC, an earlier eikonal mini‐jet model with soft gluons has now been extended to compute πp and ππ total cross‐sections.

title: Gravitational Wave Detection with Michelson Interferometers
abstract: Electromagnetic methods recently proposed for detecting gravitational waves modify the Michelson phase shift analysis (historically employed for special relativity). We suggest that a frequency modulation analysis is more suited to general relativity. An incident photon in the presence of a very long wavelength gravitational wave will have a finite probability of being returned as a final photon with a frequency shift whose magnitude is equal to the gravitational wave frequency. The effect is due to the non-linear coupling between electromagnetic and gravitational waves. The frequency modulation is derived directly from the Maxwell-Einstein equations.

title: Viscosity of high energy nuclear fluids
abstract: Relativistic high energy heavy ion collision cross sections have been interpreted in terms of almost ideal liquid droplets of nuclear matter. The experimental low viscosity of these nuclear fluids have been of considerable recent quantum chromodynamic interest. The viscosity is discussed here in terms of the string fragmentation models wherein the temperature dependence of the nuclear fluid viscosity obeys the Vogel–Fulcher–Tammann law.

title: Supercooling and final-state effects on dilepton spectra.
abstract: We consider two problems associated with the production of dileptons during collisions between heavy nuclei at the Brookhaven Relativistic Heavy Ion Collider energy. One is the difference in dilepton yield between an idealized Maxwell construction of phase coexistence and a dynamical phase transition with finite nucleation and phase conversion rates. The other is the contribution from dilepton-producing reactions involving free-streaming hadrons in the final state. We find that the mass spectrum in the range 2${\mathit{m}}_{\mathrm{\ensuremath{\pi}}}$M2 GeV is dominated by the mixed phase and the final hadron phase, is somewhat sensitive to the degree of supercooling, but is remarkably insensitive to the ``freeze-out'' temperature which delineates the passage from local thermal equilibrium to free streaming.

title: High-energy photons from expanding quark-gluon plasma and hot hadronic matter.
abstract: The emission of high-energy photons from an expanding quark-gluon plasma (QGP), which undergoes a first-order phase transition to a hot hadronic gas before freeze-out, is evaluated. Compton and annihilation processes in the quark-gluon plasma and an exhaustive array of {ital hh}{r arrow}{ital h}{gamma} reactions as wel l as decays in hot hadronic matter are considered. We find that, if the initial temperature of the QGP is more than twice the critical temperature, then, beyond a transverse momentum of about 2--3 GeV, the photons from the QGP outshine those having their origin in hadronic matter. We further note that the increase in degrees of freedom in the hot hadronic matter reduces the lifetime of the mixed phase.

title: History of quark-gluon plasma evolution from photon interferometry.
abstract: Two-photon intensity interferometry is used to probe the dynamics of quarks and gluons in a high-energy nucleus-nucleus collision. A (1+1)-dimensional expansion of the plasma according to Bjorken hydrodynamics as well as a (3+1)-dimensional expansion, both with a first-order phase transition, are considered. The correlation of high transverse-momentum photons is sensitive to the details of the space-time evolution of the high density QCD plasma. The so-called ``longitudinal'' and ``outward'' correlations are found to be dramatically affected by the transverse expansion of the system.