83,496 research outputs found
The longitudinal response function of the deuteron in chiral effective field theory
We use chiral effective field theory (EFT) to make predictions for the
longitudinal electromagnetic response function of the deuteron, f_L, which is
measured in d(e,e'N) reactions. In this case the impulse approximation gives
the full chiral EFT result up to corrections that are of O(P^4) relative to
leading. By varying the cutoff in the chiral EFT calculations between 0.6 and 1
GeV we conclude that the calculation is accurate to better than 10 % for values
of q^2 within 4 fm^{-2} of the quasi-free peak, up to final-state energies
E_{np}=60 MeV. In these regions chiral EFT is in reasonable agreement with
predictions for f_L obtained using the Bonn potential. We also find good
agreement with existing experimental data on f_L, albeit in a more restricted
kinematic domain.Comment: 33 pages, 10 figures. Accepted for publication in EPJA, with a few
further correction
Next-to-leading order QCD corrections to hadron+jet production in pp collisions at RHIC
We compute the next-to-leading order QCD corrections to the spin-independent
and spin-dependent cross-sections for the production of a single-hadron
accompanied by an opposite jet in hadronic collisions.
This process is being studied experimentally at RHIC, providing a new tool to
unveil the polarized gluon distribution Delta g. We perform a detailed analysis
of the phenomenological impact of the observable at NLO accuracy and show that
the preliminary data by the STAR collaboration confirms the idea of a small
gluon polarization in the 0.05<x<0.3 range.Comment: 16 pages, 11 Figures included. Minor typos correcte
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