180 research outputs found
Anomalous t-dependence in diffractive electroproduction of 2S radially excited light vector mesons at HERA
Within the color dipole gBFKL dynamics applied to the diffraction slope we
predict an anomalous t dependence of the differential cross section as a
function of energy and Q^2 for production of radially excited V'(2S) light
vector mesons in contradiction with a well known standard monotonous t-
behaviour for V(1S) mesons. The origin of this phenomenon is based on the
interplay of the nodal structure of V'(2S) radial wave function with the energy
and dipole size dependence of the color dipole cross section and of the
diffraction slope. We present how a different position of the node in V'(2S)
wave function leads to a different form of anomalous t- behaviour of the
differential cross section and discuss a possibility how to determine this
position from the low energy and HERA data.Comment: 15 pages and 2 figure
Parton Rescatterings in Large-x Nuclear Suppression at RHIC
We demonstrate that strong suppression of the relative production rate
(d+Au)/(p+p) of inclusive high-pT hadrons at forward rapidities observed at
RHIC is due to parton multiple rescatterings in nuclear matter. The light-cone
dipole approach-based calculations are in a good agreement with BRAHMS and STAR
data. They also indicate a significant nuclear suppression at midrapidities
with a weak onset of the coherence effects. This prediction is supported by the
preliminary d+Au data from the PHENIX Collaboration. Moreover, since similar
suppression pattern is also expected to show up at lower energies where effects
of parton saturation are not expected, we are able to exclude from the
interpretation of observed phenomena models based on the Color Glass
Condensate.Comment: 6 pages, 3 figures. Talk given at XXXVIII International Symposium on
Multiparticle Dynamics (ISMD-08), DESY, Hamburg, Germany, 15-20 Sep 2008, and
talk given at XIX International Baldin Seminar on High Energy Physics
Problems (Baldin-08), Dubna, Russia, 29 Sep - 4 Oct 200
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