arXiv subjects

Tobiasz Czopowicz

Publications and source records attributed to Tobiasz Czopowicz.

9 recordsLinked to original sources

arXiv2026

Isospin-symmetry violation - kaons and beyond (ISO-BREAK 25: summary and outlook)

This report summarizes the presentations and discussions during the ISO-BREAK 25 Workshop ``Isospin symmetry violation: kaons and beyond'', which was held at Jan Kochanowski University in Kielce on October 23--25, 2025. We address the current status of the isospin-symmetry breaking discovered by NA61/SHINE in nucleus--nucleus collisions at the CERN SPS, its confirmation by other experiments and studies in \ee and deep inelastic scattering. In addition, we discuss the theoretical status as well as we outline experimental and theoretical priorities towards understanding this currently unexplained phenomenon.

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arXiv2026

Simple Power-Law Model for generating correlated particles

A search for the critical point of the strongly interacting matter by studying power-law fluctuations within the framework of intermittency is ongoing. In particular, experimental data on proton and pion production in heavy-ion collisions are analyzed in transverse momentum space. In this regard, a simple Monte Carlo model with an explicit power-law multi-particle correlation in transverse momentum space is introduced. The model is intended as a phenomenological tool to study the sensitivity of intermittency analyses to power-law correlated particles in the presence of various detector effects.

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arXiv2021

Impact of momentum resolution on factorial moments due to power-law correlations between particles

The effect of momentum resolution on factorial moments due to the power-law correlation function is studied. The study is motivated by the search for the critical point of the strongly interacting matter in heavy-ion collisions using the intermittency method. We observe that factorial moments are significantly affected by the finite momentum resolution. The effect is superficially significant compared to intuitive expectations. The results depend on the power of the correlation function and the number of uncorrelated particles.

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arXiv2021

Scaling of factorial moments in cumulative variables

A search for power-law fluctuations within the framework of the intermittency method is ongoing to locate the critical point of the strongly interacting matter. In particular, experimental data on proton and pion production in heavy-ion collisions are analyzed in transverse-momentum, $p_T$, space. In this regard, we have studied the dependence of the second scaled factorial moment $F_2$ of particle multiplicity distribution on the number of subdivisions of transverse momentum-interval used in the analysis. The study is performed using a simple model with a power-law two-particle correlation function in $p_T$. We observe that $F_2$ values depend on the size and position of the $p_T$ interval. However, when we convert the non-uniform transverse-momentum distribution to uniform one using cumulative transformation, $F_2$ calculated in subdivisions of the cumulative $p_T$ becomes independent of the cumulative-$p_T$ interval. The scaling behaviour of $F_2$ for the cumulative variable is observed. Moreover, $F_2$ follows a power law with the number of subdivisions of the cumulative-$p_T$ interval with the intermittency index close to the correlation function's exponent.

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arXiv2020

Overview of experimental critical point search

The existence and location of the QCD critical point is an object of vivid experimental and theoretical studies. Rich and beautiful data recorded by experiments at SPS and RHIC allow for a systematic search for the critical point - the search for a non-monotonic dependence of various correlation and fluctuation observables on collision energy and size of colliding nuclei.

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arXiv2015

Transverse momentum and multiplicity fluctuations in the Be+Be energy scan from NA61/SHINE

The NA61/SHINE experiment aims to discover the Critical Point of strongly interacting matter and study the properties of the onset of deconfinement. These goals are to be achieved by per- forming a two-dimensional phase diagram ($T-μ_{B}$) scan by measurements of hadron production properties in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of col- lision energy and system size. Close to the Critical Point an increase of fluctuations is predicted. This contribution presents preliminary results on transverse momentum and multiplicity fluctua- tions expressed in terms of strongly intensive quantities from the Be+Be energy scan. The data are fully corrected for contributions from non-target interactions. The Be+Be results are compared with NA61/SHINE measurements from the p+p energy scan, with NA49 results from central Pb+Pb collisions as well as with model predictions.

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arXiv2014

Results from the NA61/SHINE ion program

The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study properties of the onset of deconfinement. These goals are to be achieved by performing a two dimensional phase diagram ($T$-$μ_{B}$) scan - measurements of hadron production properties in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of collision energy and system size. This contribution summarizes current the status and future plans as well as presents the first physics results of the NA61/SHINE ion program.

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arXiv2013

Transverse momentum fluctuations and Δη-Δϕcorrelations in p+p interactions at the CERN SPS energies

The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study the properties of the onset of deconfinement. These goals are to be achieved by performing a two dimensional phase diagram (T-μ_B) scan by measurements of hadron production properties in proton-proton, proton-nucleus and nucleus-nucleus interactions as a function of collision energy and system size. Close to the critical point an increase of fluctuations is predicted. In this contribution preliminary results on transverse momentum fluctuations and two-particle pseudorapidity/azimuthal angle correlations from the NA61/SHINE energy scan of p+p collisions will be presented. These new results will be compared with NA49 data on central Pb+Pb collisions and model predictions.

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arXiv2012

NA61/SHINE physics program -- first results and future plans

The NA61/SHINE experiment aims to discover the critical point of strongly interacting matter and study properties of the onset of deconfinement. These goals are to be achieved by performing a twodimensional phase diagram (T - μB) scan measurements of hadron production as a function of collision energy and system size. With its large acceptance and good particle identification NA61/SHINE also performs detailed and precise particle production measurements for the T2K, Pierre Auger Observatory and KASCADEGrande experiments. This contribution summarizes current status and future plans as well as presents the first physics results of the NA61/SHINE experiment.

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