Transverse momentum fluctuations and \Delta\eta-\Delta\phi correlations in p+p interactions at the CERN SPS energies

The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement. These goals are to be achieved by performing a two dimensional phase diagram (T-\mu_B) scan by measurements of hadron production properties in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of collision energy and system size. Close to the critical point an increase of fluctuations is predicted. In this contribution preliminary results on transverse momentum fluctuations and two-particle pseudorapidity/azimuthal angle correlations from the NA61/SHINE energy scan of p+p collisions will be presented. These new results will be compared with NA49 data on central Pb+Pb collisions and model predictions.Comment: CPOD 2013 proceedings, 5 pages, 12 figure

Simple Power-Law Model for generating correlated particles

A search for the critical point of the strongly interacting matter by studying power-law fluctuations within the framework of intermittency is ongoing. In particular, experimental data on proton and pion production in heavy-ion collisions are analyzed in transverse momentum space. In this regard, a simple model with a power-law multi-particle correlations is introduced. The model can be used to study sensitivity to detect power-law correlated particles in the presence of various detector effects.Comment: 5 pages, 2 figure

NA61/SHINE physics program -- first results and future plans

The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study properties of the onset of deconfinement. These goals are to be achieved by performing a twodimensional phase diagram (T - {\mu}B) scan measurements of hadron production as a function of collision energy and system size. With its large acceptance and good particle identification NA61/SHINE also performs detailed and precise particle production measurements for the T2K, Pierre Auger Observatory and KASCADEGrande experiments. This contribution summarizes current status and future plans as well as presents the first physics results of the NA61/SHINE experiment.Comment: ISMD2011 conference proceedings 4 pages, 4 figure

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

Results from the NA61/SHINE ion program

The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study properties of the onset of deconfinement. These goals are to be achieved by performing a two dimensional phase diagram ($T$-$\mu_{B}$) scan - measurements of hadron production properties in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of collision energy and system size. This contribution summarizes current the status and future plans as well as presents the first physics results of the NA61/SHINE ion program

Study of KS0K^{0}_{S} meson production in NA61 experiment at the CERN SP

One of the main problems of heavy-ion physics is search for the quark-gluon plasma (QGP), study its properties and characteristics of the phase transition between hadron nuclear matter and the QGP. Existence of the QGP has been introduced by J. C. Collins and M. J. Perry in 1975 [1]. In the QGP quarks and gluons, fundamental constituents of known matter, are expected to appear as free particles. Outside the plasma they are always confined inside hadrons. Unfortunately the quark-gluon plasma can not be directly observed experimentally. However, there are certain phenomena that attest to its existence. These include strangeness production enhancement, suppression of J = , fluctuations and jet quenching. They allow to study properties the plasma. In 2008, the world’s most powerful particle accelerator – the LHC at CERN has been launched. In the nearest future it will be able to collide protons at the energy of up to 14 TeV per nucleon pair and lead ions at the maximum energy of 5.5 TeV per nucleon pair. There are four big and three smaller experiments located at the accelerator exploring the most interesting areas of high energy physics. However, due to too high energy, data on the QGP describe the area beyond the onset of deconfinement. NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) operates at the SPS accelerator (Su- per Proton Synchrotron) at CERN with much less energy than in LHC. It focuses on the study of the phase transition and the expected critical point’s properties. This would allow to provide infor- mation on the formation of the plasma. NA61/SHINE studies QGP signatures at different available energies and using different sizes of projectile and target. In addition, the experiment collects refer- ence data for the T2K experiment (neutrino physics), and KASKADE-Grande experiment (cosmic ray physics). This thesis is devoted to the study of production processes of K 0 S mesons in collisions of beam of protons with a carbon target at the beam momentum of 30.9 GeV/c. Data was collected in 2007 by the NA61/SHINE experiment. The goal of the analysis was to understand better mechanisms of production of strange particles in collisions at the low SPS energies

Search for critical point via intermittency analysis in NA61/SHINE

One of the main goals of NA61/SHINE, a fixed-target experiment at the CERN SPS, is the search for the critical point of strongly interacting matter. The comprehensive data collected during a two-dimensional scan in beam momentum (13$A$-150$A$ GeV/$c$) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, Pb+Pb) allows, in particular, for a systematic search for an enhancement of fluctuations of various observables. An example of such observable is local fluctuation of particle densities in transverse momentum space, which can be probed with an intermittency analysis by measuring the scaling behavior of factorial moments of multiplicity distributions. This contribution reviews the ongoing NA61/SHINE studies of scaled factorial moments of proton multiplicity distributions. New results were obtained for Ar+Sc at 150$A$ GeV/$c$ ($\sqrt{s_{NN}} \approx$ 17 GeV) and Pb+Pb at 30$A$ GeV/$c$ ($\sqrt{s_{NN}} \approx$ 7.5 GeV) collisions, employing a novel approach using cumulative quantities and independent data points are presented

Energy Dependence of the Transverse Momentum Distributions of Charged Particles in pp Collisions Measured by ALICE

Differential cross sections of charged particles in inelastic pp collisions as a function of p_T have been measured at $\sqrt{s}$ = 0.9, 2.76 and 7 TeV at the LHC. The $p_T$ spectra are compared to NLO-pQCD calculations. Though the differential cross section for an individual $\sqrt{s}$ cannot be described by NLO-pQCD, the relative increase of cross section with sqrt(s) is in agreement with NLO-pQCD. Based on these measurements and observations, procedures are discussed to construct pp reference spectra at $\sqrt{s}$ = 2.76 and 5.02 TeV up to $p_T$ = 50 GeV/c as required for the calculation of the nuclear modification factor in nucleus-nucleus and proton-nucleus collisions