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Observation of a Coherence Length Effect in Exclusive Rho^0 Electroproduction
K. Ackerstaff
Exclusive incoherent electroproduction of the rho^0(770) meson from 1H, 2H, 3He, and 14N targets has been studied by the HERMES experiment at squared four-momentum transfer Q**2>0.…
Determination of the Deep Inelastic Contribution to the Generalised Gerasimov-Drell-Hearn Integral for the Proton and Neutron
K. Ackerstaff
The virtual photon absorption cross section differences [sigma_1/2-sigma_3/2] for the proton and neutron have been determined from measurements of polarised cross section asymmetri…
The neutrino ground state in a neutron star
Ken Kiers, Michel H. G. Tytgat
We address a recent claim that the stability of neutron stars implies a lower bound on the mass of the neutrino. We argue that the result obtained by some previous authors is due t…
Measurement of the Proton Spin Structure Function g1p with a Pure Hydrogen Target
A. Airapetian
A measurement of the proton spin structure function g1p(x,Q^2) in deep-inelastic scattering is presented. The data were taken with the 27.6 GeV longitudinally polarised positron be…
The Flavor Asymmetry of the Light Quark Sea from Semi-inclusive Deep-inelastic Scattering
K. Ackerstaff
The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02<x<0.3 and 1 GeV^2<Q^2<10 GeV^2, for the first time from semi-inclusive deep-ine…
The HERMES Spectrometer
K. Ackerstaff
The HERMES experiment is collecting data on inclusive and semi-inclusive deep inelastic scattering of polarised positrons from polarised targets of H, D, and He. These data give in…
Beam-Induced Nuclear Depolarisation in a Gaseous Polarised Hydrogen Target
K. Ackerstaff
Spin-polarised atomic hydrogen is used as a gaseous polarised proton target in high energy and nuclear physics experiments operating with internal beams in storage rings. When such…
Anomalous amplitudes in a thermal bath
R. D. Pisarski, T. L. Trueman, M. H. G. Tytgat
I review the implications of the axial anomaly in a thermal bath. I assume that the Adler-Bardeen theorem applies at nonzero temperature, so that the divergence of the axial curren…
Possibility of spontaneous parity violation in hot QCD
D. Kharzeev, R. D. Pisarski, M. H. G. Tytgat
We suggest that for QCD in the limit of a large number of colors, N, the axial U(1) symmetry of massless quarks is effectively restored at the deconfining=chiral phase transition.…