6,072 research outputs found
Radial Excitations of Heavy Mesons
Recent discovery of D_s states suggests existence of radial excitations. Our
semirelativistic quark potential model succeeds in reproducing these staes
within one to two percent of accuracy compared with the experiments, D_s0(2860)
and D_s^*(2715), which are identified as 0^+ and 1^- radial excitations (n=2).
We also present calculations of radial excitations for B/B_s heavy mesons.
Relation between our formulation and the modified Goldberger-Treiman relation
is also described.Comment: 3 pages, 1 figure, QNP06 conference repor
Perturbative and non-perturbative QCD corrections to wide-angle Compton scattering
We investigate corrections to the handbag approach for wide-angle Compton
scattering off protons at moderately large momentum transfer: the photon-parton
subprocess is calculated to next-to-leading order QCD and contributions from
the generalized parton distribution E} are taken into account. Photon and
proton helicity flip amplitudes are non-zero due to these corrections which
leads to a wealth of polarization phenomena in Compton scattering. Thus, for
instance, the incoming photon asymmetry or the transverse polarization of the
proton are non-zero although small.Comment: 19 pages, 9 figures (using LATEX with epsfig
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