86 research outputs found
Azimuthal flow in hadron collisions from quark-gluon string repulsion
Color flux tubes (quark-gluon strings), formed at early stages of
hadron-hadron collisions, may overlap in case of sufficiently high densities
and interact, producing long-range azimuthal correlations. In the hypothesis of
repulsive interaction, each string may acquire, before the hadronization, the
additional transverse boost, which is an efficient sum of all accounted
string-string interactions. This modifies transverse momenta to the particles
formed in string decay, leading to modification of event-wise observables, like
azimuthal asymmetry of two-particle correlations, over a wide range of
rapidity.
In this article we discuss results of Monte Carlo model with string
repulsion, where efficient string-string interaction radius is introduced. We
show that the effect of string repulsion can be the main dynamic origin of the
elliptic flow and of the higher harmonics, which are reflected in the
complicated structures observed in two-particle long-range correlation topology
in nucleus-nucleus collisions at RHIC and at LHC.Comment: 9 pages, http://dx.doi.org/10.1051/epjconf/20161250401
Multi-pomeron exchange model for and collisions at ultra-high energy
A new variant of the effective pomeron exchange model is proposed for the
description of the correlation, observed in and collisions at
center-of-mass energy from SPS to LHC, between mean transverse momentum and
charged particles multiplicity. The model is based on the Regge-Gribov
approach. Smooth logarithmic growth with the collision energy was established
for the parameter k, the mean rapidity density of charged particles produced by
a single string. It was obtained in the model by the fitting of the available
experimental data on charged particles rapidity density in and
collisions. The main effect of the model, a gradual onset of string
collectivity with the growth of collision energy, is accounted by a free
parameter {\beta} that is responsible in an effective way for the string fusion
phenomenon. Another free parameter, t, is used to define string tension. We
extract parameters {\beta} and t from the available experimental results on
-multiplicity correlation at nucleon collision energy from 17
GeV to 7 TeV. Smooth dependence of both {\beta} and t on energy allows to make
predictions for the correlation behavior at the collision energy of 14 TeV. The
indications to the string interaction effects in high multiplicity events in
collisions at the LHC energies are also discussed.Comment: 7 pages, 7 figures, to appear in proc. QFTHEP'201
Correlation between heavy flavour production and multiplicity in pp and p-Pb collisions at high energy in the multi-pomeron exchange model
The multiplicity dependence of heavy flavour production in pp-collisions at
LHC energies is studied in the framework of the multi-pomeron exchange model.
The model is introducing the string-string interaction collectivity effects in
pp collisions, which modifies multiplicity and transverse momenta, leading to
the non-trivial mean pt vs. multiplicity (_Nch - Nch) correlation. The
string collectivity strength parameter is fixed by experimental data on
multiplicity and transverse momentum correlation in a wide energy range (from
ISR to LHC). The particles discrimination is implemented according to Schwinger
mechanism taking into account the strong decays of hadron resonances. We
demonstrate, that the faster-than-linear growth of the open charm production
with the event charged particle multiplicity, observed in experimental pp high
energy collisions, can be explained by the modification of the string tension
due to the increasing overlap and interaction of quark-gluon strings. The model
is extended for p-A interactions and the calculations for p-Pb collisions are
performed.The research was supported by the grant of the Russian Science Foundation (project 16-12-10176)
Two-particle correlations in azimuthal angle and pseudorapidity in inelastic p + p interactions at the CERN Super Proton Synchrotron
Results on two-particle ΔηΔϕ correlations in inelastic p + p interactions at 20, 31, 40, 80, and 158 GeV/c are presented. The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer at the CERN Super Proton Synchrotron. The data show structures which can be attributed mainly to effects of resonance decays, momentum conservation, and quantum statistics. The results are compared with the Epos and UrQMD models.ISSN:1434-6044ISSN:1434-605
Neutron emission from electromagnetic dissociation of Pb nuclei at √ s NN = 2.76 TeV measured with the ALICE ZDC
The ALICE Zero Degree Calorimeter system (ZDC) is composed of two identical sets of calorimeters, placed at opposite sides with respect to the interaction point, 114 meters away from it, complemented by two small forward electromagnetic calorimeters (ZEM). Each set of detectors consists of a neutron (ZN) and a proton (ZP) ZDC. They are placed at zero degrees with respect to the LHC axis and allow to detect particles emitted close to beam direction, in particular neutrons and protons emerging from hadronic heavy-ion collisions (spectator nucleons) and those emitted from electromagnetic processes. For neutrons emitted by these two processes, the ZN calorimeters have nearly 100% acceptance. During the √ sNN = 2.76 TeV Pb-Pb data-taking, the ALICE Collaboration studied forward neutron emission with a dedicated trigger, requiring a minimum energy deposition in at least one of the two ZN. By exploiting also the information of the two ZEM calorimeters it has been possible to separate the contributions of electromagnetic and hadronic processes and to study single neutron vs. multiple neutron emission. The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at √ s NN = 2.76 TeV, with neutron emission, are σ single EMD = 187:4 ± 0.2 (stat.)-11.2 +13.2 (syst.) b and σmutual EMD = 5.7 ± 0.1 (stat.) ±0.4 (syst.) b, respectively [1]. This is the first measurement of electromagnetic dissociation of 208Pb nuclei at the LHC energies, allowing a test of electromagnetic dissociation theory in a new energy regime. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model'701st International Conference on New Frontiers in Physics, ICFP 20122012-06-10Kolymbari, Crete; Greecesem informaçã
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