6,762 research outputs found
Sea quark transverse momentum distributions and dynamical chiral symmetry breaking
Recent theoretical studies have provided new insight into the intrinsic
transverse momentum distributions of valence and sea quarks in the nucleon at a
low scale. The valence quark transverse momentum distributions (q - qbar) are
governed by the nucleon's inverse hadronic size R^{-1} ~ 0.2 GeV and drop
steeply at large p_T. The sea quark distributions (qbar) are in large part
generated by non-perturbative chiral-symmetry-breaking interactions and extend
up to the scale rho^{-1} ~ 0.6 GeV. These findings have many implications for
modeling the initial conditions of perturbative QCD evolution of TMD
distributions (starting scale, shape of p_T distributions, coordinate-space
correlation functions). The qualitative difference between valence and sea
quark intrinsic p_T distributions could be observed experimentally, by
comparing the transverse momentum distributions of selected hadrons in
semi-inclusive deep-inelastic scattering, or those of dileptons produced in pp
and pbar-p scattering.Comment: 9 pages, 5 figures. Proceedings of QCD Evolution Workshop, Jefferson
Lab, May 6-10, 201
First order effects of production on the continuum theory of spherical electrostatic probes
First order effects of production on continuum theory of spherical Langmuir probes in infinite, homogeneous, slightly ionized, collision-dominated plasm
Looking back at slow employment growth
An analysis of slower-than-normal employment growth in the post-1991 economic recovery, examining trends at both the state and national level and finding a widespread weakness in the rate of job addition in growing industries, rather than an unusually high job deletion rate in contracting industries.Employment (Economic theory) ; Economic conditions - United States
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