# The Critical Point and Onset of Deconfinement (CPOD 2018), Corfu Island, Greece

Europe/Zurich
• Monday, 24 September
• 09:00 09:20
Talk (invitation for NA61): New results on spectra and fluctuations from NA61 20m
Speakers: Katarzyna Grebieszkow (Warsaw University of Technology (PL)), Katarzyna Grebieszkow (Warsaw University of Technology (PL))

K. Grebieszkow for the NA61/SHINE Collaboration

“New results on spectra and fluctuations from NA61”

The NA61/SHINE experiment aims to discover the critical point of strongly
interacting matter and study the properties of the onset of deconfinement. For this
purpose we perform a two-dimensional scan of the (T-mu_B) phase diagram by varying
the energy (5.1 < sqrt(s_NN) < 16.8/17.3 GeV) and the system size (p+p, p+Pb, Be+Be,
Ar+Sc, Xe+La, Pb+Pb) of the collisions.

In this presentation the NA61/SHINE results on particle spectra as well as
fluctuations and correlations in p+p, Be+Be, Ar+Sc, and Pb+Pb collisions will be
presented. In particular, the latest results on charged kaons spectra, charged
pions ratios (electromagnetic effects), protons intermittency, femtoscopic radii,
anisotropic flow, and higher order moments of multiplicity and net-charge
fluctuations are planned to be discussed. The NA61/SHINE data will be compared to
predictions of models and to the results from other experiments at the same energy
range.

Finally, the motivation, NA61/SHINE plans, and the first measurements of open charm
production in heavy ion collisions at the Super Proton Synchrotron energies will be
shown.

• 09:20 09:40
Talk: Recent measurements of identified hadron spectra and multiplicities in Ar+Sc and Be+Be collisions at SPS energies 20m
Speaker: Mr Maciej Piotr Lewicki (University of Wroclaw (PL))
• 09:40 10:00
Talk: Recent results from proton intermittency analysis in nucleus-nucleus collisions from NA61/SHINE at CERN SPS 20m
Speaker: Nikolaos Davis (Polish Academy of Sciences (PL))
• 10:00 10:20
Talk: First NA61/SHINE results on Bose-Einstein correlation function 20m
Speaker: Mr Barnabas Porfy (Hungarian Academy of Sciences (HU))
• 10:20 10:40
Talk: Anisotropic flow measurements from NA61/SHINE and NA49 experiments at CERN SPS 20m
Speakers: Ilya Selyuzhenkov (GSI / MEPhI), Viktor Klochkov (GSI), Oleg Golosov (National Research Nuclear University MEPhI (RU)), Evgeny Kashirin (National Research Nuclear University MEPhI (RU))
• 10:40 11:00
Talk: K*(892)0 production in p+p interactions at 158 GeV/c from NA61/SHINE 20m
Speaker: Angelika Magdalena Tefelska (Warsaw University of Technology (PL))

A. Tefelska for the NA61/SHINE Collaboration
“K*(892) 0 production in p+p interactions at 158 GeV/c from NA61/SHINE”

The NA61/SHINE experimental physics program is focused on searching of the critical
point and on the study of the properties of the onset of deconfinement. The scan of
the phase diagram of strongly interacting matter is done by changing the energy of
colliding ions (from 13A to 150/158A GeV) and by changing the system size (from p+p
to Pb+Pb).

The main topic of this talk are the preliminary results of K*(892)^0 meson
production in p+p interactions at beam momentum 158 GeV/c. The analysis K*(892)^0
was done for the first time with the template method in K^+ p^- decay channel. The
results include the double differential spectra d^2n/(dydp_T ),d^2n/(m_T dm_T dy) as well as
p_T integrated and extrapolated dn/dy spectra. The mass and width of K*(892)^0 in
function of transverse momenta are also presented with comparison to the world
data. Finally, the multiplicity of K*(892)^0 and the ratio of <K*(892)^0>/<K -> as a
function of sqrt(s_NN) is presented together with results of other experiments.

• 11:00 11:20
Talk: Open charm measurements at CERN SPS energies in the NA61/SHINE experiment - status and plans 20m
Speaker: Anastasia Merzlaya (St Petersburg State University (RU), Jagiellonian University (PL))

Open charm measurements at CERN SPS energies in the NA61/SHINE experiment  - status and plans

The study of open charm meson production provides an efficient tool for detailed investigations of the properties of hot and dense matter formed in nucleus-nucleus collisions. In particular, charm mesons are of vivid interest in the context of the phase-transition between confined hadronic matter and the quark-gluon plasma. Recently, the experimental setup of NA61/SHINE experiment was supplemented with a small-acceptance version of the Vertex Detector (SAVD) which was motivated by the importance and the possibility of the first direct measurements of open charm mesons in heavy ion collisions at SPS energies.

First exploratory data taking of Pb+Pb collisions at 150$A$ GeV/c with SAVD was performed in 2016, and a $D^0$  signal was extracted in it's $D^0 \rightarrow \pi^{+} + K^{-}$ decay channel. This was the first, direct observation of open charm in nucleus-nucleus collisions at the SPS energies. In October and November of 2017 a large statistic data set has been taken for Xe+La with SAVD at the beam momenta of 150$A$, 75$A$ and 40$A$ GeV/c; these data are currently under intense analysis.

The physics motivation behind the open charm measurements at the SPS energies will be discussed. The concept of the SAVD hardware and the status of the analysis will be shown, discussing challenges related to the reconstruction in SAVD. Also, the future plans of open charm measurements in the NA61/SHINE experiment after 2020 related to the upgraded version of the Vertex Detector will be presented.

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