CPOD 2020 Baku

Europe/Zurich

 

Below a copy of NA61/SHINE contributions to CPOD 2020.

We should reconsider them before CPOD 2021.

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  • Monday, 15 March
    • 09:00 09:20
      Talk (invitation for NA61/SHINE): Study of the onset of deconfinement – recent results from NA61/SHINE 20m
      Speaker: Szymon Pulawski (University of Silesia (PL))

      Title: Study of the onset of deconfinement – recent results from NA61/SHINE.

       

      One of the main physics goals of the NA61/SHINE programme on strong interactions is the study of the properties of the onset of deconfinement. This goal is pursued by performing an energy (beam momentum 13\textit{A}-- 158\textit{A}~GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La) scan. This talk reviews results and plans of NA61/SHINE. In particular, inclusive spectra in inelastic p+p and centrality selected Be+Be, Ar+Sc interactions at the SPS energies will be shown. The energy dependence of quantities inspired by the Statistical Model of the Early Stage (kink, horn and step) shows interesting behaviour which is not described by Monte-Carlo models. Moreover a system size dependence of particle production properties shows unexpected behaviour. Finally, the current achievements and futures plans related to the measurement of open charm production will be presented.

    • 09:20 09:40
      Talk (invitation for NA61/SHINE): Fluctuations and correlations study at NA61/SHINE 20m
      Speaker: Tobiasz Czopowicz (Jan Kochanowski University, Warsaw University of Technology)
    • 09:40 10:00
      Talk: Net-charge and multiplicity fluctuations in system size and energy scans at the SPS energy range 20m
      Speakers: Justyna Monika Cybowska (Warsaw University of Technology (PL)), Maja Katarzyna Mackowiak-Pawlowska (Warsaw University of Technology (PL))

      Title: Net-charge and multiplicity fluctuations in system size and energy scan at the SPS energy range

       

      One of the key goals of relativistic heavy ion collisions is to understand the phase diagram of strongly interacting matter. This goal requires studies of numerous quantities including correlations and fluctuations.

      Currently, one of the most popular directions of studies in relativistic heavy ion collisions are fluctuations of higher order moments. The most popular are fluctuations of conserved charges in heavy ion collision due to their possible connection with susceptibilities which can be obtained from lattice QCD calculations.

      The NA61/SHINE experimen is designed to study fluctuations with a large hadron spectrometer with precise particle reconstruction and event centrality selection. In addition, it gives a unique opportunity to compare fluctuations in different systems at the same collision energies.

      In this contribution, results on net-charge and multiplicity fluctuations from the NA61/SHINE scan in system size and energy will be shown. Presented experimental data will be compared with different model predictions.

    • 10:00 10:20
      Talk: Critical point search through proton intermittency analysis in NA61/SHINE 20m
      Speaker: Nikolaos Davis (Polish Academy of Sciences (PL))

      Title: Critical point search through proton intermittency analysis in NA61/SHINE.

      The search for experimental signatures of the critical point (CP) of strongly interacting matter is one of the main objectives of the NA61/SHINE experiment at CERN SPS. In the course of the experiment, a beam momentum (13A – 150/158A GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, Pb+Pb) scan is performed. Local proton density fluctuations in transverse momentum space represent an order parameter of the chiral phase transition and are expected to scale according to a universal power-law in the vicinity of the CP.

      We investigate proton density fluctuations through an intermittency analysis of the proton second scaled factorial moments (SSFMs) in transverse momentum space. Previous such analyses revealed power-law behavior in NA49 Si+Si collisions at 158A GeV/c, the fitted power-law exponent being consistent with the theoretically expected critical value, within errors. As of today, Be+Be and Ar+Sc NA61/SHINE systems at the maximum SPS energy have been analyzed; no effect is observed in Be+Be, whereas an intermittency effect of low statistical significance is detected in non-central Ar+Sc. We now extend the analysis to a wider range of NA61/SHINE collision systems and energies. We employ, and accordingly adapt, statistical techniques to subtract non-critical background and estimate statistical and systematic uncertainties. Additionally, we use Monte Carlo simulations to assess the statistical significance of the observed intermittency effect.

    • 10:20 10:40
      Talk: Strangeness production and the onset of fireball at NA61/SHINE 20m
      Speaker: Mr Maciej Piotr Lewicki (University of Wroclaw (PL))

      Abstract:

      NA61/SHINE is a fixed target experiment at the CERN Super Proton Synchrotron. The experiment studies the properties of strongly interacting matter in the vicinity of the onset of deconfinement through collisions of ions, varying both the collision energy and the size of colliding nuclei. The most recent analyses of hadron production in ^{40}Ar+^{45}Sc and ^{7}Be+^{9}Be interactions deliver some puzzling results concerning the system size dependence of strangeness production, which cannot be reproduced by theoretical models. The pronounced differences of charged kaon production properties in small (p+p and Be+Be) and large (Ar+Sc and Pb+Pb) systems can be interpreted as a signature of the "onset of fireball" - a beginning of creation of large clusters from binary collisions of nucleons.
      In this talk, I will review the newest preliminary results on identified charged kaons produced in Ar+Sc and Be+Be interactions at five beam momenta (19A, 30A, 40A, 75A and 150A GeV/c). Finally, I will present possible evidence of the onset of fireball and emphasize possible explanations.

    • 10:40 11:00
      Talk: Methodology of measurements of net-charge and multiplicity fluctuations in Pb+Pb collisions at the SPS energy range 20m
      Speakers: Evgeny Andronov, Dr Evgeny Andronov (St Petersburg State University (RU))

      One of the possible key signals of the critical point of strongly interacting matter is a non-monotonic behaviour of fluctuations-related observables with energy of collisions. Higher order moments and cumulants of multiplicity and net-charge distributions are among them as they can be related to Lattice QCD predictions. 

      In 2016 the NA61/SHINE experiment collected data on Pb+Pb at 13A GeV/c and 30A GeV/c beam momenta. This region of energy density achieved in collisions corresponds to the region with intriguing non-monotonic signatures observed by the STAR experiment at RHIC in Au+Au collisions. In this talk a number of features of measurements of fluctuations observables in the fixed-target experiment and importance of proper event and track selection will be covered. The performance of the NA61/SHINE spectrometer in the high track density environment of Pb+Pb collisions will be presented. In addition, the transverse momentum and rapidity dependence of cumulants will be discussed.

    • 11:00 11:20
      Talk: Anisotropic flow measurements from the NA61/SHINE and NA49 beam momentum scan programs at CERN SPS 20m
      Speakers: Evgeny Kashirin (National Research Nuclear University MEPhI (RU)), Ilya Selyuzhenkov (GSI, Darmstadt), Oleg Golosov (National Research Nuclear University MEPhI (RU)), Viktor Klochkov (Goethe University Frankfurt (DE)), Viktor Klochkov (GSI)


      Title: Anisotropic flow measurements from the NA61/SHINE and NA49 beam
      momentum scan programs at the CERN SPS

      Authors: E. Kashirin​ , V. Klochkov​, O. Golosov​, I. Selyuzhenkov​​
      for the NA61/SHINE and NA49 Collaborations

      Abstract:

      ​The NA61/SHINE experiment at the CERN SPS has recently extended its
      program for the energy scan with Pb ions. In the past, the NA49
      experiment, which preceded NA61/SHINE, also recorded data for
      Pb-Pb collisions at different energies. Together, the two experiments
      cover a wide range of beam energies provided by the CERN SPS in the range 13 - 150 A GeV/c. Analysis of the new NA61/SHINE data and reanalysis of the existing NA49 data
      using modern measurement techniques allow for a new comprehensive
      systematic study of collective flow relative to the spectator plane. The measurements at the lowest energy available at the SPS are also
      relevant for the preparation of the Compressed Baryonic Matter (CBM)
      heavy-ion​ experiment​ at​ the​ future​ FAIR​ facility​ in​ Darmstadt.

      We will present new NA61/SHINE results on directed and elliptic flow
      measurement in Pb-Pb collisions at 13 and 30A GeV/c relative to the
      spectator plane determined with the Projectile Spectator Detector. Also
      a new analysis of 40​A GeV data collected by the NA49 experiment using
      forward spectator calorimeters (VETO and RCAL) will be shown. The flow
      coefficients are reported as a function of rapidity and transverse
      momentum in different classes of collision centrality. The new results
      are compared with existing results from the previous NA49 analysis and
      the STAR experiment at RHIC.

    • 11:20 11:40
      Talk: Upgrade of the NA61/SHINE detector at the CERN SPS 20m
      Speaker: Piotr Podlaski (University of Warsaw (PL))

      The NA61/SHINE detector is facing major hardware upgrade during Long Shutdown 2 period at CERN (LS2 2019-2021). The upgrade is essential for the open charm measurement program planned by NA61/SHINE after LS2. The main purpose  of the upgrade is to increase the readout rate up to 1 kHz and increase acceptance in the high track density environment. The following elements of the detector are parts of the
      upgrade: Time Projection Chambers (TPC), Vertex Detector (VD), Beam Position Detectors (BPD), Particle Spectator Detector (PSD) and Time of Flight detector (TOF). On top of the detectors, new Trigger and Data Acquisition (TDAQ) system will be developed. This means completely new design of trigger system and readout scheme. In this talk the progress on design and development of new detectors and TDAQ system for NA61/SHINE experiment will be presented.