J. Biernat
A5017259922- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Nuclear reactor physics and engineering
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Nuclear physics research studies
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Advanced NMR Techniques and Applications
- Computational Physics and Python Applications
- Muon and positron interactions and applications
- Nuclear Physics and Applications
- Statistical Methods and Bayesian Inference
- Particle accelerators and beam dynamics
- Advanced Data Storage Technologies
- Spectroscopy Techniques in Biomedical and Chemical Research
- Advancements in Photolithography Techniques
- Sulfur-Based Synthesis Techniques
- Pulsars and Gravitational Waves Research
- Quantum, superfluid, helium dynamics
- Stochastic processes and statistical mechanics
- Geophysics and Gravity Measurements
University of Bergen
2024
Institute of Nuclear Physics, Polish Academy of Sciences
2021-2024
University of Pavol Jozef Šafárik
2022-2024
A. Alikhanyan National Laboratory
2021-2023
Uppsala University
2019-2022
Lund University
2022
Institute of High Energy Physics
2019-2021
Robert Bosch (Germany)
2021
Technical University of Munich
2021
Jagiellonian University
2013-2020
The GERDA experiment searches for the lepton-number-violating neutrinoless double-β decay of ^{76}Ge (^{76}Ge→^{76}Se+2e^{-}) operating bare Ge diodes with an enriched fraction in liquid argon. exposure broad-energy germanium type (BEGe) detectors is increased threefold respect to our previous data release. BEGe feature excellent background suppression from analysis time profile detector signals. In window a level 1.0_{-0.4}^{+0.6}×10^{-3} counts/(keV kg yr) has been achieved; if normalized...
We report a study of the processes e+e−→K+D−sD*0 and K+D*−sD0 based on e+e− annihilation samples collected with BESIII detector operating at BEPCII five center-of-mass energies ranging from 4.628 to 4.698 GeV total integrated luminosity 3.7 fb−1. An excess events over known contributions conventional charmed mesons is observed near D−sD*0 D*−sD0 mass thresholds in K+ recoil-mass spectrum for √s=4.681 GeV. The structure matches mass-dependent-width Breit-Wigner line shape, whose pole width...
Abstract The ALICE experiment was proposed in 1993, to study strongly-interacting matter at extreme energy densities and temperatures. This proposal entailed a comprehensive investigation of nuclear collisions the LHC. Its physics programme initially focused on determination properties quark–gluon plasma (QGP), deconfined state quarks gluons, created such collisions. has been extended cover broader ensemble observables related Quantum Chromodynamics (QCD), theory strong interactions. studied...
There has recently been a dramatic renewal of interest in the subjects hadron spectroscopy and charm physics. This renaissance driven part by discovery plethora charmonium-like $XYZ$ states at BESIII $B$ factories, observation an intriguing proton-antiproton threshold enhancement possibly related $X(1835)$ meson state BESIII, as well measurements mesons baryons. We present detailed survey important topics tau-charm physics that can be further explored over remaining lifetime BEPCII...
The process of $e^+e^- \rightarrow p\bar{p}$ is studied at 22 center-of-mass energy points ($\sqrt{s}$) from 2.00 to 3.08 GeV, exploiting 688.5~pb$^{-1}$ data collected with the BESIII detector operating BEPCII collider. Born cross section~($\sigma_{p\bar{p}}$) measured energy-scan technique and it found be consistent previously published data, but much improved accuracy. In addition, electromagnetic form-factor ratio ($|G_{E}/G_{M}|$) value effective ($|G_{\rm{eff}}|$), electric ($|G_E|$)...
A bstract The p T -differential production cross sections of prompt and non-prompt (produced in beauty-hadron decays) D mesons were measured by the ALICE experiment at midrapidity ( | y < 0 . 5) proton-proton collisions $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 5 02 TeV. data sample used analysis corresponds to an integrated luminosity (19 3 ± 4) nb − 1 reconstructed from their decays → K π + ,...
Using a sample of $1.31\times10^9$ $J/\psi$ events collected with the BESIII detector at electron-positron collider BEPCII, we analyse full $J/\psi \to$ $\Xi^-\overline{\Xi}^+$, $\Xi^-\to \Lambda \pi^-$, $\Lambda\to p\pi^-$, $\overline{\Xi}^+\to\overline{\Lambda}\pi^+$, $\overline{\Lambda}\to\overline{p}\pi^+$ decay chain. A new method, exploiting fact that $\Xi^-\overline{\Xi}^+$ pair is entangled and sequentially decaying, where complete chains are reconstructed, applied for first time....
We study the polarization of inclusive J/ψ produced in Pb-Pb collisions at sqrt[s_{NN}]=5.02 TeV LHC dimuon channel, via measurement angular distribution its decay products. perform rapidity region 2.5<y<4, for three transverse momentum intervals (2<p_{T}<4, 4<p_{T}<6, 6<p_{T}<10 GeV/c) and as a function centrality collision 2<p_{T}<6 GeV/c. For first time, is measured with respect to event plane collision, by considering angle between positive-charge muon rest frame axis perpendicular...
The production of the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>ψ</a:mi><a:mo stretchy="false">(</a:mo><a:mn>2</a:mn><a:mi>S</a:mi><a:mo stretchy="false">)</a:mo></a:math> charmonium state was measured with ALICE in Pb-Pb collisions at <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:msqrt><e:msub><e:mi>s</e:mi><e:mrow><e:mi>NN</e:mi></e:mrow></e:msub></e:msqrt><e:mo>=</e:mo><e:mn>5.02</e:mn><e:mtext> </e:mtext><e:mtext>...
The measurements of the inclusive J/ψ yield at midrapidity (|y|<0.9) and forward rapidity (2.5 <y< 4) in Pb–Pb collisions sNN=5.02 TeV with ALICE detector LHC are reported. production yields nuclear modification factors, RAA, measured as a function collision centrality, transverse momentum (pT), rapidity. average squared (〈pT〉 〈pT2〉) evaluated centrality midrapidity. Compared to previous publications, here entire dataset collected during Run 2 is used, which improves precision extends pT...
We study the e^{+}e^{-}→γωJ/ψ process using 11.6 fb^{-1} e^{+}e^{-} annihilation data taken at center-of-mass energies from sqrt[s]=4.008 GeV to 4.600 with BESIII detector BEPCII storage ring. The X(3872) resonance is observed for first time in ωJ/ψ system a significance of more than 5σ. relative decay ratio X(3872)→ωJ/ψ and π^{+}π^{-}J/ψ measured be R=1.6_{-0.3}^{+0.4}±0.2, where uncertainty statistical second systematic (the same hereafter). sqrt[s]-dependent cross section...
The cross section of the process ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\chi}}_{c0}$ is measured at center-of-mass energies from $\sqrt{s}=4.178$ to 4.278 GeV using a data sample $7\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ collected with BESIII detector operating BEPCII storage ring. dependence on $\sqrt{s}$ shows resonant structure mass...
From 1310.6×10^{6} J/ψ and 448.1×10^{6} ψ(3686) events collected with the BESIII experiment, we report first observation of Σ^{+} Σ[over ¯]^{-} spin polarization in e^{+}e^{-}→J/ψ[ψ(3686)]→Σ^{+}Σ[over decays. The relative phases form factors ΔΦ have been measured to be (-15.5±0.7±0.5)° (21.7±4.0±0.8)° data, respectively. nonzero value allows for a direct simultaneous measurement decay asymmetry parameters Σ^{+}→pπ^{0}(α_{0}=-0.998±0.037±0.009) ¯]^{-}→p[over ¯]π^{0}(α[over...
The Born cross sections of the $e^{+}e^{-}\to\Sigma^{+}\bar{\Sigma}^{-}$ and $e^{+}e^{-}\to\Sigma^{-}\bar{\Sigma}^{+}$ processes are determined with high precision for center-of-mass energy from 2.3864 to 3.0200 GeV BESIII detector. Nonzero near threshold observed. resulting ratio effective form factors $\Sigma^{+}$ $\Sigma^{-}$ is consistent 3, agreeing incoherent sum squared charges valence quarks, but disagreeing various theoretical predictions. In addition, ratios electric magnetic...
A bstract The cross section for coherent photonuclear production of J/ ψ is presented as a function the electromagnetic dissociation (EMD) Pb. measurement performed with ALICE detector in ultra-peripheral Pb-Pb collisions at centre-of-mass energy per nucleon pair $$ \sqrt{{\textrm{s}}_{\textrm{NN}}} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msqrt><mml:msub><mml:mi>s</mml:mi><mml:mi>NN</mml:mi></mml:msub></mml:msqrt></mml:math> = 5.02 TeV. Cross sections are five different...
The production of prompt ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}$ baryons has been measured at midrapidity in the transverse momentum interval $0<{p}_{T}<1 \text{GeV}/c$ for first time, $pp$ and $p$--Pb collisions a center-of-mass energy per nucleon-nucleon collision $\sqrt{{s}_{NN}}=5.02\phantom{\rule{0.16em}{0ex}}\text{TeV}$. measurement was performed decay channel ${\mathrm{\ensuremath{\Lambda}}}_{c}^{+}\ensuremath{\rightarrow}p{K}_{S}^{0}$ by applying new reconstruction techniques using...
The measurement of the production deuterons, tritons and $^{3}\mathrm{He}$ their antiparticles in Pb-Pb collisions at $\sqrt{{s}_{NN}}=5.02\phantom{\rule{4pt}{0ex}}\mathrm{TeV}$ is presented this article. measurements are carried out midrapidity $(|y|< 0.5)$ as a function collision centrality using ALICE detector. ${p}_{\mathrm{T}}$-integrated yields, coalescence parameters ratios to protons antiprotons reported compared with nucleosynthesis models. comparison these results different systems...
Abstract Luminosity determination within the ALICE experiment is based on measurement, in van der Meer scans, of cross sections for visible processes involving one or more detectors (visible sections). In 2015 and 2018, Large Hadron Collider provided Pb–Pb collisions at a centre-of-mass energy per nucleon pair √ s NN = 5.02 TeV. Two sections, associated with particle detection Zero Degree Calorimeter (ZDC) V0 detector, were measured scan. This article describes experimental set-up analysis...
The exclusive process $e^+e^-\rightarrow\Lambda\bar{\Lambda}$, with $\Lambda \to p\pi^-$ and $\bar{\Lambda} \bar{p}\pi^+$, has been studied at $\sqrt{s} =$ 2.396 GeV for measurement of the $\Lambda$ electric magnetic form factors, $G_E$ $G_M$. A data sample, corresponding to an integrated luminosity 66.9 pb$^{-1}$, was collected BESIII detector this purpose. multi-dimensional analysis a complete decomposition spin structure reaction enables determination modulus ratio $R=|G_E/G_M|$ and,...
Crucial inputs for a variety of $CP$-violation studies can be determined through the analysis pairs quantum-entangled neutral $D$ mesons, which are produced in decay $\ensuremath{\psi}(3770)$ resonance. The relative strong-phase parameters between ${D}^{0}$ and ${\overline{D}}^{0}$ decays ${D}^{0}\ensuremath{\rightarrow}{K}_{S,L}^{0}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ studied using $2.93\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$ ${e}^{+}{e}^{\ensuremath{-}}$...
Using $e^{+}e^{-}$ collision data samples with center-of-mass energies ranging from 2.000 to 2.644 GeV, collected by the BESIII detector at BEPCII collider, and a total integrated luminosity of 300 pb^{-1}, partial-wave analysis is performed for process $e^{+}e^{-} \to K^{+}K^{-}\pi^{0}\pi^{0}$. The Born cross sections K^{+}K^{-}\pi^{0}\pi^{0}$, as well f or subprocesses \phi \pi^{0}\pi^{0}$, $K^{+}(1460)K^{-}$, $K^{+}_{1}(1400)K^{-}$, $K^{+}_{1}(1270)K^{-}$ $K^{*+}(892)K^{*-}(892)$, are...
Cross sections of the process e+e−→π0π0J/ψ at center-of-mass energies between 3.808 and 4.600 GeV are measured with high precision by using 12.4 fb−1 data samples collected BESIII detector operating BEPCII collider facility. A fit to energy-dependent cross confirms existence charmoniumlike state Y(4220). The mass width Y(4220) determined be (4220.4±2.4±2.3) MeV/c2 (46.2±4.7±2.1) MeV, respectively, where first uncertainties statistical second systematic. consistent those in e+e−→π+π−J/ψ....