Overview and Recent Results from BRAHMS

The BRAHMS experiment was designed to measure and characterize in particular the properties of rapidity dependence of particle production in heavy ion collisions. The data-taking is now over, results of several years of analysis have been published and demonstrates several important features of the rapidity dependence, not envisioned from the start of the RHIC program. The bulk properties of the system formed at high rapidity resemble that of systems at lower energies at mid-rapidity when referenced via the baryo-chemical potential. New physics in AA are essentially observed at mid-rapidity including the demonstration that high-\pT suppression is a final state effect. Another key result is that in d+A collisions at forward rapidities where the very low-x region of the nucleus was probed, a strong suppression of pion production was observed consistent with the picture of gluon saturation. The latest results examines the centrality and rapidity dependence of nuclear stopping, the particle production of pions, collective expansion vs. rapidity, and the baryon enhancement at intermediate values of \pT .Comment: 8 pages, 6 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee Fixed typos and minor text issues as per organizers review reques

Charmonium production in pp collisions with ALICE

The ALICE Collaboration studies the production of J/psi meson in pp collisions at the center-of-mass energies of 2.76 and 7 TeV at mid- and forward-rapidity. Inclusive production cross-sections are presented as a function of the collision energy, rapidity and transverse-momentum. The J/psi polarization measurements in the helicity and Collins-Soper frames are discussed. A novel result on the correlation between the collision charged particle multiplicity and J/psi yield is also shown.Comment: Talk given at the XX International Workshop on Deep-Inelastic Scattering (DIS2012), 26-30 March 2012, Bonn, Germany; 4 pages, 5 figure

Jψ\psi nuclear modification factor at mid-rapidity in Pb-Pb collisions at sNN=\sqrt{s_{NN}}=2.76 TeV

We report on the J$\psi$ nuclear modification factor $R_{\rm AA}$ at mid-rapidity ($|y|<0.9$) in Pb-Pb collisions at $\sqrt{s_{NN}}=$2.76 TeV measured by ALICE. J$\psi$ candidates are reconstructed using their $e^+e^-$ decay channel. The kinematical coverage extends to zero transverse momentum allowing the measurement of integrated cross sections. We show the centrality dependence of the J$\psi$ $R_{\rm AA}$ at mid-rapidity compared to the results from PHENIX at mid-rapidity and ALICE results at forward-rapidity. We also discuss comparisons to calculations from theoretical models.Comment: Proceedings for the Quark Matter Conference, Washington, 13-18 August 2012. To be published in Nuclear Physics

J/ψJ/\psi Production in Pb-Pb collisions at sNN=\sqrt{s_{NN}}=2.76 TeV

We report on the $J/\psi$ production in Pb-Pb collisions at $\sqrt{s_{NN}}=$2.76 TeV recorded with ALICE during the 2010 and 2011 LHC runs. The $J/\psi$ candidates are reconstructed using the $e^{+}e^{-}$ and $\mu^{+}\mu^{-}$ decay channels at mid- and forward rapidity, respectively. We show the $J/\psi$ nuclear modification factor $R_{AA}$ as a function of centrality, transverse momentum and rapidity. Our results are compared to the lower energy measurements from PHENIX and to model calculations.Comment: Proceedings to the FAIRNESS workshop for young scientists with research interests focused on physics at FAIR, Hersonissos, Greece, Sept. 3-8, 2012. 5 pages, 4 figures; Submitted to Journal of Physics Conference Serie

Small-x Physics with the ALICE experiment at the CERN-LHC

High energy p-p, p-Pb and Pb-Pb collisions at the CERN-LHC offer unprecedented opportunities for studying wide variety of physics at small Bjorken-x. Here we discuss capabilities of the ALICE experiment at the CERN-LHC for probing small-x QCD physics. A new forward electromagnetic calorimeter is being proposed as an ALICE upgrade to explore the small-x region in more detail.Comment: Prepared for the Workshop on "Saturation, the Color Glass Condensate and Glasma: What Have we Learned from RHIC?" - to be published in Nucl. Phys.

The management of cultural adjustment: Central-South-East European ethnic minorities in the USA

The paper focuses on one particular instance in the management of change as accomplished/implemented in the USA by the ethnic minorities originally from Italy, Greece and Romania. The author presents a diachronic survey of the literature against the author’s own findings. The paper identifies common patterns in the cultural adjustment of all three ethnic groups surveyed and analyses them against the specific developmental pressures in each group. Historic, economic and sociological data contribute to outlining the distinct profile of each ethnic groups under investigation, as well as the assimilation patterns at work throughout its evolution in the new US cultural environment.ethnicity affirmed, ethnicity under attack, peripheral ethnicity

XmaxμX_{max}^{\mu} vs. NμN^{\mu} from Extensive Air Showers as estimator for the mass of primary UHECR's. Application for the Pierre Auger Observatory

We study the possibility of primary mass estimation for Ultra High Energy Cosmic Rays (UHECR's) using the $X_{max}^{\mu}$ (the height where the number of muons produced on the core of Extensive Air Showers (EAS) is maximum) and the number $N^{\mu}$ of muons detected on ground. We use the 2D distribution - $X_{max}^{\mu}$ against $N^{\mu}$ in order to find its sensitivity to the mass of the primary particle. For that, we construct a 2D Probability Function $Prob(p,Fe \ | \ X_{max}^{\mu},N^{\mu})$ which estimates the probability that a certain point from the plane $(X_{max}^{\mu}$, $N^{\mu})$ corresponds to a shower induced by a proton, respectively an iron nucleus. To test the procedure, we analyze a set of simulated EAS induced by protons and iron nuclei at energies of $10^{19} eV$ and $20^{\circ}$ zenith angle with CORSIKA. Using the Bayesian approach and taking into account the geometry of the infill detectors from the Pierre Auger Observatory, we observe an improvement in the accuracy of the primary mass reconstruction in comparison with the results obtained using only the $X_{max}^{\mu}$ distributions

QCD Saturation and Deuteron-Nucleus Collisions

We make quantitative predictions for the rapidity and centrality dependencies of hadron multiplicities in dA collisions at RHIC basing on the ideas of parton saturation in the Color Glass Condensate.Comment: 16 pages, 5 figures; added Erratum with a discussion of centrality selection procedure and comparison to the published experimental result