1,923 research outputs found
How to measure the Charm Density in the Proton at EIC
We study two experimental ways to measure the heavy-quark content of the
proton: using the Callan-Gross ratio and/or the azimuthal
asymmetry in deep inelastic lepton-nucleon scattering. Our
approach is based on the following observations. First, unlike the production
cross sections, the ratio and the azimuthal
asymmetry in heavy-quark leptoproduction are sufficiently stable, both
parametricallly and perturbatively, in a wide region of variables and
within the fixed-flavor-number scheme of QCD. Second, both these quantities,
and asymmetry, are sensitive to resummation of
the mass logarithms of the type within
the variable-flavor-number schemes. These two facts together imply that the
heavy-quark densities in the nucleon can, in principle, be determined from
high- data on the Callan-Gross ratio and/or the azimuthal asymmetry in
heavy-quark leptoproduction. In particular, the charm content of the proton can
be measured in future studies at the proposed Large Hadron-Electron (LHeC) and
Electron-Ion (EIC) Colliders.Comment: 9 pages, 4 figures, LaTeX. Talk given at the Workshop on Exclusive
Reactions at High Momentum Transfer (IV), May 18-21, 2010, TJNAF, Newport
News, VA and Electron-Ion Collider Collaboration Meeting, July 29-31, 2010,
Catholic University of America, Washington, D
On the reactions p + p -> p + Lambda + K^+ and p + p -> p + Sigma^0 + K^+ near thresholds
The cross sections for the reactions of the strange production p + p -> p +
Lambda + K^+ and p + p -> p + Sigma^0 + K^+ near thresholds of the final states
p Lambda K^+ and p Sigma^0 K^+ are calculated in the effective Lagrangian
approach. Our approach is based on the dominant contribution of the one-pion
exchange and strong interaction of the colliding protons in the initial state.
The theoretical values of the cross sections agree reasonably well with the
experimental data. The polarization properties of the Lambda and Sigma^0
hyperons are discussed.Comment: 15 pages, 1 Postscript figure, Latex, to appear in Eur. Phys. J
- …