157 research outputs found
A CGC/saturation approach for angular correlations in proton-proton scattering
We generalized our model for the description of hard processes, and calculate
the value of the azimuthal angle correlations ( Fourier harmonics ), for
proton-proton scattering.The energy and multiplicity independence, as well as
the value of , turn out the be in accord with the experimental data, or
slightly larger.
Therefore, before making extreme assumptions on proton-proton collisions,
such as the production of quark-gluon plasma in the large multiplicity events,
we need to explain how these effect theBose-Einstein correlations which are so
large, that have to be taken into account, and which are able to describe the
angular correlations in proton-proton collisions, without including final state
interactionsComment: 26 pp. 17 figures in eps file
CGC/saturation approach: soft interaction at the LHC energies
In this paper we demonstrate that our model which is based on the
CGC/saturation approach, is able to describe the soft interaction collisions
including the new TOTEM prelimenary data at 13 TeV. We believe that this
strengthens the argument that the CGC/saturation approach is the only viable
candidate for an effective theory for high energy QCD.Comment: 6pp,4 figures. arXiv admin note: substantial text overlap with
arXiv:1706.07617, arXiv:1607.0059
Diffraction in QCD
This lecture presents a short review of the main features of diffractive
processes and QCD inspired models. It includes the following topics: (1)
Quantum mechanics of diffraction: general properties; (2) Color dipole
description of diffraction; (3) Color transparency; (4) Soft diffraction in
hard reactions: DIS, Drell-Yan, Higgs production; (5) Why Pomerons interact
weakly; (6) Small gluonic spots in the proton; (7) Diffraction near the
unitarity bound: the Goulianos-Schlein "puzzle"; (8) Diffraction on nuclei:
diffractive Color Glass; (9) CGC and gluon shadowing.Comment: Based on the lecture given by B.K. at I LAWHEP, Porto Alegre, Brazil,
December 1-3, 200
Leading Neutrons From Polarized Proton-Nucleus Collisions
Leading neutron production on protons is known to be subject to strong
absorptive corrections, which have been under debate for a long time. On
nuclear targets these corrections are significantly enhanced and push the
partial cross sections of neutron production to the very periphery of the
nucleus. As a result, the A-dependences of inclusive and diffractive neutron
production turn out to be similar. The mechanism of \pi-a_1 interference, which
successfully explained the observed single-spin asymmetry of neutrons in
polarized pp interactions, is extended here to polarized pA collisions.
Corrected for nuclear effects it explains well the magnitude and sign of the
asymmetry A_N observed in inelastic events, resulting in a violent break up of
the nucleus. However the excessive magnitude of A_N observed in the diffractive
sample, remains a challenge.Comment: 5 pages, 4 figures. Invited talk at DIFFRACTION 2016, September 2 -
8, 2016, Sicil
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