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    Nuclear modification of hadron production measured by alice

    Lietava, Roman
    Journal of Physics: Conference Series, 2012, Vol.381(1), p.012040 (6pp) [Peer Reviewed Journal]
    IOPscience (IOP Publishing)
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    Title: Nuclear modification of hadron production measured by alice
    Author: Lietava, Roman
    Subject: Large Hadron Collider ; Quarks ; Gluons ; Correlation Analysis ; Partons ; Spectra ; Hadrons ; Nucleons ; Energy Measurement ; Atomic and Molecular Physics (General) (So) ; Physics of Metals (MD) ; Physics (General) (Ah);
    Description: The Large Hadron Collider (LHC) collides lead nuclei at an unprecedented centre of mass energy of 2.76 TeV/nucleon to measure the properties of the strongly interacting matter when partons are liberated from nucleons and create a Quark Gluon Plasma. The highly energetic partons propagating through medium are absorbed and thus probe its characteristics. The highly energetic hadrons produced by fragmentation of these partons, provide information about the energy loss of the original quarks and gluons. The energy loss can be studied by measuring the modification of hadron spectra and correlations produced in heavy ion collisions with respect to proton-proton. The ALICE experiment is one of 4 large LHC experiments. It is dedicated to the study of the strong force by colliding heavy ions. The modifications of high momentum particle spectra and their correlation, measured by ALICE experiment, are presented. The consequences of these measurements on the evolution of strongly interacting matter are discussed.
    Is part of: Journal of Physics: Conference Series, 2012, Vol.381(1), p.012040 (6pp)
    Identifier: 1742-6588 (ISSN); 1742-6596 (E-ISSN); 10.1088/1742-6596/381/1/012040 (DOI)

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    Diffraction in ALICE and trigger efficiencies

    Navin, Sparsh
    University of Birmingham
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    Title: Diffraction in ALICE and trigger efficiencies
    Author: Navin, Sparsh
    Date: 2011
    Subject: Qc Physics
    Description: ALICE is built to measure the properties of strongly interacting matter created in heavy-ion collisions. In addition, taking advantage of the low pT acceptance in the central barrel, ALICE is playing an important role in understanding pp collisions with minimum bias triggers at LHC energies. The work presented in this thesis is based on pp data simulated by the ALICE collaboration and early data collected at a center-of-mass energy of 7 TeV. A procedure to calculate trigger efficiencies and an estimate of the systematic uncertainty due to the limited acceptance of the detector are shown. A kinematic comparison between Monte Carlo event generators, PYTHIA 6, PYTHIA 8 and PHOJET is also presented. To improve the description of diffraction in PYTHIA, a hard diffractive component was added to PYTHIA 8 in 2009, which is described. Finally a trigger with a high efficiency for picking diffractive events is used to select a sample with an enhanced diffractive component from pp data. These data are compared to Monte Carlo models, and the results are summarized with an estimate of the systematic uncertainty.

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    J/\(\psi\) production in proton-proton collisions at ALICE LHC

    Kour, Ravjeet
    University of Birmingham
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    Title: J/\(\psi\) production in proton-proton collisions at ALICE LHC
    Author: Kour, Ravjeet
    Date: 2011
    Subject: Qc Physics
    Description: A Large Ion Collider Experiment (ALICE) studies the strong interaction part (Quantum Chromo Dynamics) of the Standard Model at the CERN Large Hadron Collider. ALICE has been designed as a general-purpose heavy-ion detector in order to explore phenomena of strong interacting matter and the quark-gluon plasma (QGP) at extreme values of energy density and temperature in nucleus-nucleus collisions. Results are presented here on the study of J/\(\psi\)production in pp collisions at ALICE. In particular, a measurement of J/\(\psi\) cross-section at \(\sqrt{s}\) = 7 TeV energy has been performed, together with a study of a possible algorithm to separate primary J/\(\psi\) from those coming from decays of B hadrons. The validity of this algorithm in ALICE has been demonstrated using Monte-Carlo samples. The J/\(\psi\) particles have been searched exclusively in the decay channel J/\(\psi\) -> e+e−. The study focused on what would be achievable in a period of early running, with integrated luminosity of L=1.25 nb-1, at a proton-proton centre of mass collision energy of \(\sqrt{s}\) = 7 TeV.

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    Search for medium effects with jet-like hadron correlations at ALICE at the LHC

    Scott, Patrick Aaron
    University of Birmingham
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    Title: Search for medium effects with jet-like hadron correlations at ALICE at the LHC
    Author: Scott, Patrick Aaron
    Date: 2013
    Subject: Qc Physics
    Description: We present an analysis of the properties of jets in proton-proton and lead-lead collisions at the ALICE experiment at the CERN Large Hadron Collider. The jet width and transverse momentum imbalance were studied in minimum bias proton collisions. The width was found to be independent of hadron transverse momentum and to have a larger value than measurements from earlier experiments at lower beam energies, consistent with theoretical expectations. The imbalance was found to increase with collision energy and also with the transverse momentum of the hadrons in the jet. The dependence of jet yield on the produced multiplicity was studied in proton and ion collisions, with a view to identifying suppression through interaction with a quark-gluon plasma. This suppression was identified in lead collisions as expected, but no suppression was observed in high multiplicity proton collisions. The jet width and tranverse momentum imbalance were also studied as a function of multiplicity. In proton collisions, the jet width was measured to be independent of multiplicity and hadron transverse momentum and consistent with minimum bias measurements. The width was observed to decrease in lead collisions of increasing centrality; this was interpreted as a suppression of the high momentum hadrons in the jet.

    • Several versions

    Strangeness production in nuclear interactions at 200 A GeV and the number of nucleon-nucleon collisions

    Lietava, Roman, Pišút, Ján
    The European Physical Journal C - Particles and Fields, 1998, Vol.5(1), pp.135-141 [Peer Reviewed Journal]

    • Several versions

    Strangeness production in nuclear interactions at 200 AGeV and the number of nucleon-nucleon collisions

    Lietava, Roman, Pisut, Jan
    arXiv.org, Nov 11, 1997

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    A model of binary collisions dependence of jet quenching in nuclear collisions at ultrarelativistic energies

    Lietava, Roman, Pisut, Jan, Pisutova, Neva, Tomasik, Boris
    arXiv.org, Jan 12, 2004
    © ProQuest LLC All rights reserved, Engineering Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Engineering Collection (ProQuest)
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    Title: A model of binary collisions dependence of jet quenching in nuclear collisions at ultrarelativistic energies
    Author: Lietava, Roman; Pisut, Jan; Pisutova, Neva; Tomasik, Boris
    Contributor: Tomasik, Boris (pacrepositoryorg)
    Subject: Collisions ; Quenching ; Dependence ; Nucleons
    Description: We describe a model of jet quenching in nuclear collisions at RHIC energies. In the model, jet quenching is to be caused by the interruption of jet formation by nucleons arriving at the position of jet formation in a time shorter than the jet formation time. Our mechanism predicts suppression of high-pt spectra also in d+Au reactions.
    Is part of: arXiv.org, Jan 12, 2004
    Identifier: 2331-8422 (E-ISSN)

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    A model of binary collisions dependence of jet quenching in nuclear collisions at ultrarelativistic energies

    Lietava, Roman, Pisut, Jan, Pisutova, Neva, Tomasik, Boris
    Acta Physica Slovaca 53 (2003) 453
    Cornell University
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    Title: A model of binary collisions dependence of jet quenching in nuclear collisions at ultrarelativistic energies
    Author: Lietava, Roman; Pisut, Jan; Pisutova, Neva; Tomasik, Boris
    Subject: Nuclear Theory
    Description: We describe a model of jet quenching in nuclear collisions at RHIC energies. In the model, jet quenching is to be caused by the interruption of jet formation by nucleons arriving at the position of jet formation in a time shorter than the jet formation time. Our mechanism predicts suppression of high-pt spectra also in d+Au reactions. Comment: 11 pages, 4 eps figures (stored in 5 eps-files), uses ActaStyle.cls (provided), minor changes in wording, one typo corrected, results unchanged
    Is part of: Acta Physica Slovaca 53 (2003) 453
    Identifier: nucl-th/0309014 (ARXIV ID)

    • Several versions

    An alternative model of jet suppression at RHIC energies

    Lietava, Roman, Pisut, Jan, Pisutova, Neva, Tomasik, Boris
    arXiv.org, Feb 10, 2003 [Peer Reviewed Journal]

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    A model of anomalous production of strange baryons in nuclear collisions

    Lietava, Roman, Pisut, Jan, Pisutova, Neva, Zavada, Petr
    arXiv.org, Jun 18, 1998
    © ProQuest LLC All rights reserved, Engineering Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Engineering Collection (ProQuest)
    Available
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    Title: A model of anomalous production of strange baryons in nuclear collisions
    Author: Lietava, Roman; Pisut, Jan; Pisutova, Neva; Zavada, Petr
    Contributor: Zavada, Petr (pacrepositoryorg)
    Subject: Strangeness ; Collisions ; Baryons ; Hadrons ; Synchrotrons ; Nucleons
    Description: We propose a simple model of production of strange baryons and antibaryons in nuclear collisions at the CERN SPS. The model takes into account both the increase of strangeness production in collisions of lighter ions and a possibility of the formation of anomalous, strangeness rich matter in central PbPb interactions. It is shown that ratios like \(::\) depend strongly on the presence of anomalous matter and can be used to determine its phenomenological parameters. In the model we assume that particle composition of final state hadrons is essentially given by a rapid recombination of quarks and antiquarks formed in tube-on-tube interactions of incoming nucleons.
    Is part of: arXiv.org, Jun 18, 1998
    Identifier: 2331-8422 (E-ISSN)