A. Merzlaya
A5107899299- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Neutrino Physics Research
- Dark Matter and Cosmic Phenomena
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Particle accelerators and beam dynamics
- Non-Destructive Testing Techniques
- Advanced Welding Techniques Analysis
- Microstructure and Mechanical Properties of Steels
- CCD and CMOS Imaging Sensors
- Statistical Mechanics and Entropy
- Astrophysics and Cosmic Phenomena
- Stochastic processes and statistical mechanics
- Scientific Research and Discoveries
- Quantum, superfluid, helium dynamics
University of Oslo
2023-2025
Unge aksjonærer
2024
Jagiellonian University
2017-2023
St Petersburg University
2016-2019
Measurements of inclusive spectra and mean multiplicities $$\pi ^\pm $$ , K $$^\pm p $${\bar{\text {p}}}$$ produced in inelastic + interactions at incident projectile momenta 20, 31, 40, 80 158 $$\text{ GeV }/c$$ ( $$\sqrt{s} = 6.3, 7.7, 8.8, 12.3 17.3 }$$ respectively) were performed the CERN Super Proton Synchrotron using large acceptance NA61/SHINE hadron spectrometer. Spectra are presented as function rapidity transverse momentum compared to predictions current models. The measurements...
Strong interactions preserve an approximate isospin symmetry between up (u) and down (d) quarks, part of the more general flavor symmetry. In case K meson production, if this were exact, it would result in equal numbers charged (K+ K−) neutral (K0 $${\overline{K}}^{0}$$ ) mesons produced collisions isospin-symmetric atomic nuclei. Here, we report results on relative abundance over production argon scandium nuclei at a center-of-mass energy 11.9 GeV per nucleon pair. We find that K+ K−...
Abstract The NA61/SHINE experiment at the CERN Super Proton Synchrotron studies onset of deconfinement in strongly interacting matter through a beam energy scan particle production collisions nuclei varied sizes. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions mean multiplicities $$\pi ^\pm $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>±</mml:mo> </mml:msup> </mml:math> ,...
Abstract This paper reports measurements of two-pion femtoscopic correlations in Be+Be collisions at a beam momentum 150 $$A\,\hbox {GeV}\!/\!c$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>A</mml:mi> <mml:mspace /> <mml:mtext>GeV</mml:mtext> <mml:mo>/</mml:mo> <mml:mi>c</mml:mi> </mml:mrow> </mml:math> (energy available the center-of-mass system for nucleon pair $$\sqrt{s_{\text {NN}}} = 16.84$$ <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi>...
The measurement of open charm meson production provides a tool for the investigation properties hot and dense matter created in nucleus-nucleus collisions at relativistic energies. In particular, mesons are vivid interest context study nature phasetransition between confined hadronic quark-gluon plasma. Recently, NA61/SHINE experimental setup was upgraded with high spatial resolution Vertex Detector which enables reconstruction secondary vertices from decays. first direct neutral D yields...
A good knowledge of nuclear fragmentation cross sections is important to interpret the fluxes secondary cosmic rays from Galaxy. Here we report new measurements with NA61/SHINE experiment at CERN SPS. The specific focus on for production boron in Galaxy interactions <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi mathvariant="normal">C</a:mi><a:mprescripts/><a:none/><a:mn>12</a:mn></a:mmultiscripts></a:math> nuclei hydrogen interstellar medium, including...
We present a measurement of the momentum spectra ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${\mathrm{K}}^{\ifmmode\pm\else\textpm\fi{}}$, ${\mathrm{p}}^{\ifmmode\pm\else\textpm\fi{}}$, $\mathrm{\ensuremath{\Lambda}}$, $\overline{\mathrm{\ensuremath{\Lambda}}}$, and ${\mathrm{K}}_{\mathrm{S}}^{0}$ produced in interactions negatively charged pions with carbon nuclei at beam momenta 158 $350\text{ }\text{ }\mathrm{GeV}/c$. The total production cross sections are measured as well....
Abstract The NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) studies onset of deconfinement in hadron matter by a scan particle production collisions nuclei with various sizes set energies covering SPS energy range. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions mean multiplicities $$\pi ^\pm $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>±</mml:mo>...
The production of $K^{0}_{S}$ mesons in inelastic $\textit{p+p}$ collisions at beam momentum 158 GeV/c ($\sqrt{s_{NN}}=17.3$ GeV) was measured with the NA61/SHINE spectrometer CERN Super Proton Synchrotron. Double-differential distributions were obtained transverse and rapidity. mean multiplicity determined to be $0.162 \pm 0.001 (stat.) 0.011 (sys.)$. results on are compared model predictions (EPOS 1.99, SMASH 2.0, PHSD UrQMD 3.4 models) as well published world data.
Abstract The critical point of strongly interacting matter is searched for at the CERN SPS by NA61/SHINE experiment in central $$^{40}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mmultiscripts> <mml:mrow/> <mml:mn>40</mml:mn> </mml:mmultiscripts> </mml:math> Ar + $$^{45}$$ <mml:mn>45</mml:mn> Sc collisions 13 A , 19 30 40 and 75 GeV/ c . dependence second-order scaled factorial moments proton multiplicity distributions on number subdivisions transverse momentum space...
Abstract The physics goal of the strong interaction program NA61/SHINE experiment at CERN Super Proton Synchrotron (SPS) is to study phase diagram hadronic matter by a scan particle production in collisions nuclei with various sizes set energies covering SPS energy range. This paper presents differential inclusive spectra transverse momentum, mass and rapidity $$\pi ^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mi>π</mml:mi> <mml:mo>-</mml:mo> </mml:msup>...
This paper presents multiplicity measurements of ${K}_{\mathrm{S}}^{0}$, $\mathrm{\ensuremath{\Lambda}}$, and $\overline{\mathrm{\ensuremath{\Lambda}}}$ produced in $120\text{ }\text{ }\mathrm{GeV}/c$ proton-carbon interactions. The were made using data collected at the NA61/SHINE experiment during two different periods. Decays these neutral hadrons impact measured ${\ensuremath{\pi}}^{+}$, ${\ensuremath{\pi}}^{\ensuremath{-}}$, $p$ $\overline{p}$ multiplicities reaction, which are crucial...
The critical point of dense, strongly interacting matter is searched for at the CERN SPS in ${}^{40}$Ar + ${}^{45}$Sc collisions 150A GeV/c. dependence second-order scaled factorial moments proton multiplicity distribution on number subdivisions transverse momentum space measured. intermittency analysis performed using both and cumulative momentum. For first time, statistically independent data sets are used each subdivision number. obtained results do not indicate any significant pattern....
We present measurements of $$\rho ^0$$ , $$\omega $$ and K $$^{*0}$$ spectra in $$\pi ^{-} + C production interactions at 158 $$\text{ GeV }{/}\text{ c }$$ 350 using the NA61/SHINE spectrometer CERN SPS. Spectra are presented as a function Feynman's variable $$x_\text {F}$$ range $$0< x_\text {F} < 1$$ 0.5$$ for respectively. Furthermore, we show comparisons with previous predictions several hadronic interaction models. These essential better understanding shower development improving...
This paper presents measurements of production cross sections and inelastic for the following reactions: $60\text{ }\text{ }\mathrm{GeV}/c$ protons with C, Be, Al targets $120\text{ C Be targets. The analysis is performed using NA61/SHINE spectrometer at CERN Super Proton Synchrotron. First are obtained }\mathrm{GeV}/c$, while results compared previously published measurements. These interaction section critical inputs neutrino flux prediction in current future accelerator-based...
Abstract Results on $$\phi $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>ϕ</mml:mi></mml:math> meson production in inelastic $$p + p$$ xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>p</mml:mi><mml:mo>+</mml:mo><mml:mi>p</mml:mi></mml:mrow></mml:math> collisions at CERN SPS energies are presented. They derived from data collected by the NA61/SHINE fixed target experiment, means of invariant mass spectra fits \rightarrow K^+ K^-...
Abstract The NA61/SHINE collaboration studies at the CERN Super Proton Synchrotron (SPS) onset of deconfinement in hadronic matter by measurement particle production collisions nuclei with various sizes a set energies covering SPS energy range. This paper presents results on inclusive double-differential spectra and mean multiplicities $$\pi ^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>π</mml:mi><mml:mo>-</mml:mo></mml:msup></mml:math> mesons produced 5%...
Abstract The production of $$\Xi (1321)^{-}$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>Ξ</mml:mi> <mml:msup> <mml:mo>(</mml:mo> <mml:mn>1321</mml:mn> <mml:mo>)</mml:mo> </mml:mrow> <mml:mo>-</mml:mo> </mml:msup> </mml:math> and $$\overline{\Xi }(1321)^{+}$$ <mml:mover> <mml:mo>¯</mml:mo> </mml:mover> <mml:mo>+</mml:mo> hyperons in inelastic p+p interactions is studied a fixed target experiment at beam momentum 158 $$\hbox {Ge}\hbox {V}\!/\!c$$...
This paper presents several measurements of total production cross sections and inelastic for the following reactions: ${\ensuremath{\pi}}^{+}+\mathrm{C}$, ${\ensuremath{\pi}}^{+}+\mathrm{Al}$, ${K}^{+}+\mathrm{C}$, ${K}^{+}+\mathrm{Al}$ at $60\text{ }\text{ }\mathrm{GeV}/c$, ${\ensuremath{\pi}}^{+}+\mathrm{C}$ ${\ensuremath{\pi}}^{+}+\mathrm{Al}$ $31\text{ }\mathrm{GeV}/c$. The were made using NA61/SPS Heavy Ion Neutrino Experiment spectrometer CERN Super Proton Synchrotron (SPS)....
Measurements of $K^{*}(892)^0$ resonance production via its $K^{+}\pi^{-}$ decay mode in inelastic $p+p$ collisions at beam momenta 40 and 80 GeV/$c$ ($\sqrt{s_{NN}}=8.8$ 12.3 GeV) are presented. The data were recorded by the NA61/SHINE hadron spectrometer CERN Super Proton Synchrotron. \textit{template} method was used to extract signal. Transverse momentum rapidity spectra obtained. mean multiplicities mesons found be $(35.1 \pm 1.3 \mathrm{(stat)} 3.6 \mathrm{(sys)) \cdot 10^{-3}}$ $(58.3...
The study of open charm meson production provides an efficient tool for the investigation properties hot and dense matter formed in nucleus-nucleus collisions. interpretation existing di-muon data from CERN SPS suffers a lack knowledge on mechanism particle production. Due to this, heavy-ion programme \NASixtyOne experiment at has been extended by precise measurements hadrons with short lifetimes. A new Vertex Detector rare processes collisions was designed meet challenges track registration...
Results on two-particle $\Delta\eta\Delta\phi$ correlations in inelastic p+p interactions at 20, 31, 40, 80, and 158~GeV/c are presented. The measurements were performed using the large acceptance NA61/SHINE hadron spectrometer CERN Super Proton Synchrotron. data show structures which can be attributed mainly to effects of resonance decays, momentum conservation, quantum statistics. results compared with EPOS UrQMD models.
The heavy-ion programme of the NA61/SHINE experiment at CERN SPS has been expanded to allow precise measurements exotic particles with short lifetime. study open charm meson production is a sensitive tool for new detailed investigations properties hot and dense matter formed in nucleus-nucleus collisions. In particular, it offers possibilities studies such phenomena as in- medium parton energy loss quarkonium dissociation possible regeneration, thus providing information probe deconfinement....