Quark Matter 2019, Wuhan, China

Europe/Zurich
  • Monday, 4 November
    • 11:00 11:20
      Talk: System size dependence of strangeness production at the CERN SPS energies 20m
      Speaker: Andrey Seryakov (St Petersburg State University (RU))

      System size dependence of strangeness production at the CERN SPS energies

      The study of strange particle production has been playing a key role in the search for the quark-gluon plasma for the last 40 years. An increase of the slope in the energy dependence of pion total yields and a strong maximum of the ratio of K+/π+ multiplicities are considered to be signals of the onset of deconfinement in heavy-ion collisions at the SPS energies. In this work we focus on the system size dependence of the deconfinement signals from NA49 and NA61/SHINE by showing measurements from p+p, Be+Be, Ar+Sc and Pb+Pb collisions. These are compared with STAR BES, SIS/AGS and LHC results on strangeness production. Statistical and dynamical models of strangeness production in the vicinity of the phase transition will be presented and compared with data. 

    • 11:20 11:40
      Talk: Measurement of Xi production in inelastic p+p collisions at 158 GeV/c and searches for pentaquark at NA61/SHINE 20m
      Speaker: Mr Maciej Piotr Lewicki (University of Wroclaw (PL))

      Title: Measurement of Xi production in inelastic p+p collisions at 158 GeV/c and searches for a pentaquark signal at NA61/SHINE

      NA61/SHINE is a multi-purpose experiment to study hadron-proton, hadron-nucleus and nucleus-nucleus collisions at the CERN Super Proton Synchrotron. The experiment covers a wide range of hadronic physics, aiming to better understand the properties of hot and dense nuclear matter.
      In this contribution I will present results of multistrange baryon production in inelastic p+p collisions at 158 GeV/c. The rapidity and transverse momentum spectra will be shown and compared to model expectations.
      Additionally, I will present methods and first results of the search of pentaquarks in NA61/SHINE, which will be confronted with the indications of a pentaquark candidate observed by the NA49 experiment (PRL 92, 042003, 2004).

    • 11:40 12:00
      Talk: K*(892)^0 and \bar{K*(892)^0} production in p+p interactions at SPS energies from NA61/SHINE 20m
      Speaker: Angelika Magdalena Tefelska (Warsaw University of Technology (PL))

      Talk: K*(892)^0 and \bar{K*(892)^0} production in p+p interactions at SPS energies from NA61/SHINE - Angelika Tefelska

      The NA61/SHINE hadron physics program focuses on a search for the critical point and on studies of the properties of the onset of deconfinement in strongly interacting matter. For this purpose the phase diagram is scanned by changing the collision energy (from 13A to 150/158A GeV) and the size of the colliding system (from p+p to Pb+Pb).

      The main topic of this talk are preliminary results on K*(892)^0 and \bar{ K*(892)^0} meson production in p+p interactions at beam momentum 40-158 GeV/c obtained by the NA61/SHINE experiment. The analysis of  K*(892)^0 was performed with a novel template method in the K+pi’ decay channel. The results include the double differential spectra d2n/(dydpT), d2n/(mTdmTdy) as well as yields dn/dy. The measured mass of the K*(892)^0 as a function of transverse momentum is also presented and compared to other published results. Finally, the multiplicity of K*(892)^0 and the ratio of <K*(892)^0>/<K+/-> as a function of system size will be presented together with the results from other experiments. 

    • 12:00 12:20
      Talk: NA61/SHINE results on fluctuations and correlations at CERN SPS energies 20m
      Speaker: Maja Katarzyna Mackowiak-Pawlowska (Warsaw University of Technology (PL))

      Title: NA61/SHINE results on fluctuations and correlations at CERN SPS energies

       

      The aim of the NA61/SHINE strong interaction programme is to explore the phase diagram of strongly interacting matter. The main physics goals are the study of the onset of deconfinement and the search for the critical point of strongly interacting matter. These goals are pursued by performing a beam momentum (13A - 158A GeV/c) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, Pb+Pb) scan. This contribution presents new results from NA61/SHINE on fluctuations and correlations which includes in particular quantum statistics correlations, as well as multiplicity and net-charge fluctuations, proton density fluctuations and anisotropic collective flow. Obtained results will be compared with other experiments and with model predictions.

    • 12:20 12:40
      Talk: Higher order moments of net-charge and multiplicity distributions at SPS energies from NA61/SHINE 20m
      Speaker: Justyna Monika Cybowska (Warsaw University of Technology (PL))

      Title: Higher order moments of net-charge and multiplicity distributions at SPS energies from NA61/SHINE.

      A specific property of the critical point, the increase in the correlation length, makes fluctuations its basic signal. Higher order moments of suitable observables are of special interest as they are more sensitive to the correlation length than typically studied second order moments. In this contribution results on higher order moments of multiplicity and net-charge in p+p and ion+ion interactions collected by the NA61/SHINE experiment will be shown. The new data will be compared with model predictions.

    • 12:40 13:00
      Talk: Proton intermittency analysis in nucleus-nucleus collisions at CERN SPS 20m
      Speaker: Nikolaos Davis (Polish Academy of Sciences (PL))

      Title: Proton intermittency analysis in nucleus-nucleus collisions at the CERN SPS

      One of the primary goals of the NA61/SHINE experiment at the CERN SPS is the detection of the critical point (CP) of strongly interacting matter. For this purpose, an energy (beam momentum 13A - 150A GeV/c, 5.1 < \sqrt{s_{NN}} < 17.3 GeV) and system size (p+p, p+Pb, Be+Be, Ar+Sc, Xe+La, Pb+Pb) scan is being performed.

      A number of observables are being considered as possible signatures of the CP. These include non-monotonic fluctuations of strongly intensive variables, as well as local fluctuations of the proton density; the latter are especially suited for the task, being connected to the critical behavior of the chiral phase transition order parameter in the neighborhood of the CP. In particular, proton density fluctuations are probed by means of an intermittency analysis of the proton second scaled factorial moments (SSFMs) in transverse momentum space, expected by universality theory to scale as a power-law in the vicinity of the CP.

      A previous analysis of this sort probed a number of NA49 heavy ion collisions of different size [1]; significant power-law fluctuations were observed in "Si"+Si collisions at 158A GeV/c, with a power-law exponent consistent with the theoretically expected critical value, within uncertainties. Recently, NA61/SHINE Be+Be collisions at 150A GeV/c were similarly probed, yielding a negative result.

      We now extend the analysis to NA61/SHINE Ar+Sc collisions at 150A GeV/c. The system size and freeze-out baryochemical potential are similar to those in "Si"+Si reactions studied by NA49, and preliminary analysis suggests the presence of intermittency. We employ statistical techniques in order to subtract non-critical background present in factorial moments and enhance the signal in cases of low statistics. Through combined use of critical and background Monte Carlo simulations, we assess the quality and statistical significance of the observed intermittency effect.

      [1] T. Anticic et al, Eur. Phys. J. C 75: 587 (2015)
       
    • 13:00 13:20
      Talk: Anisotropic flow measurements from the NA61/SHINE and NA49 beam momentum scan programs at CERN SPS 20m
      Speaker: Evgeny Kashirin (National Research Nuclear University MEPhI (RU))

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

       

      O. Golosov1, I. Selyuzhenkov1,2, E. Kashirin1, V. Klochkov2,3

      1. National Research Nuclear University, Moscow Engineering Physics Institute, Moscow, Russia,

      2. GSI, Darmstadt, Germany

      3. Frankfurt University, Frankfurt, Germany

       

      The NA61/SHINE experiment at the CERN SPS has recently extended its program to 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 in beam momenta of 13–150A GeV/c provided by the CERN SPS. Analysis of the new NA61/SHINE data and revision of the existing NA49 results using modern analysis techniques allow for a new comprehensive systematic study of the 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 and 158A 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 previous the NA49 analysis and the STAR data at RHIC.

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