111 research outputs found
Small-x effects in forward-jet production at HERA
We investigate small-x effects in forward-jet production at HERA in the
two-hard-scale region kT ~ Q>>Lambda_QCD. We show that, despite describing
different energy regimes, both a BFKL parametrization and saturation
parametrizations describe well the H1 and ZEUS data for dsigma/dx published a
few years ago. This is confirmed when comparing the predictions to the latest
data.Comment: 4 pages, 2 figures, Proceedings of the XIIIth International Workshop
on Deep Inelastic Scattering (DIS05), Madison, Wisconsin, USA, April 27-May 1
200
Azimuthal correlations of forward dijets in d+Au collisions at RHIC
Measuring correlations between forward dijets in deuteron-gold collisions at
RHIC will further test the Color Glass Condensate (CGC) picture of the nuclear
wavefunction at small-x, which successfully predicted the suppressed production
of high-p_T particles at forward rapidities in d+Au collisions: R_dA<1. I
present predictions for the correlation in azimuthal angle between forward
dijets in the CGC framework, with both multiple scatterings and non-linear QCD
evolution at small-x taken into account.Comment: 4 pages, 1 figure, Proceedings of the 20th International Conference
on Ultra-Relativistic Nucleus Nucleus Collisions (QM08), Jaipur, India,
February 4-10 200
Particle production and saturation at HERA
Perturbative QCD in the high-energy limit describes the evolution of
scattering amplitudes with increasing energy towards and into the so-called
saturation regime. Comparisons of the predictions with experimental data for a
number of observables led to significant progress and understanding. We discuss
the case of particle-production cross-sections measured at HERA and argue that
these measurements have the potential to provide evidence for the saturation
regime of QCD.Comment: 6 pages, 4 figures, Proceedings of the XXXVth International Symposium
on Multiparticle Dynamics (ISMD05), Kromeriz, Czech Republic, August 9-15
200
Open questions in QCD at high parton density
I present the state of our understanding of the QCD dynamics at play in the
parton saturation regime of nuclear wave functions. I explain what are the
biggest open questions in the field, their intrinsic interest, but also why is
it important to answer them from the quark-gluon-plasma physicists'
perspective. Focusing on those aspects that proton-nucleus collisions cannot
investigate to a satisfactory degree, I show that future high-energy
electron-ion colliders have the potential to address these questions, providing
thorough answers in most cases, and exploratory measurements otherwise.Comment: 8 pages, 9 figures, Proceedings of the 23rd International Conference
on Ultra-Relativistic Nucleus Nucleus Collisions (QM12), Washington DC, USA,
August 13-18 201
The high-energy limit of inclusive and diffractive deep inelastic scattering in QCD
Following recent progresses in the understanding of high-energy scattering in
QCD, we derive the first phenomenological consequences of Pomeron loops, in the
context of both inclusive and diffractive deep inelastic scattering. In
particular, we discuss diffusive scaling, a new scaling law that emerges for
sufficiently high energies and up to very large values of well above the
proton saturation momentum.Comment: 4 pages, 3 figures, Proceedings of the XIVth International Workshop
on Deep Inelastic Scattering (DIS06), Tsukuba, Japan, April 20-24 200
Azimuthal correlations of forward di-hadrons in d+Au collisions suppressed by saturation
RHIC experiments have recently measured the azimuthal correlation function of
forward di-hadrons. The data show a disappearance of the away-side peak in
central d+Au collisions, compared to p+p collisions, as was predicted by
saturation physics. Indeed, we argue that this effect, absent at mid-rapidity,
is a consequence of the small-x evolution into the saturation regime of the
Gold nucleus wave function. We show that the data are well described in the
Color Glass Condensate framework.Comment: 6 pages, 1 figure, Proceedings of the XXXVth International Conference
on High Energy Physics (ICHEP2010), Paris, France, July 22-28 201
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