M. Baszczyk
A5107905648- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Particle Detector Development and Performance
- Nuclear Physics and Applications
- Dark Matter and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Atomic and Subatomic Physics Research
- Medical Imaging Techniques and Applications
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- CCD and CMOS Imaging Sensors
- Photonic and Optical Devices
- Microfluidic and Capillary Electrophoresis Applications
- Microfluidic and Bio-sensing Technologies
- Calibration and Measurement Techniques
- Stochastic processes and statistical mechanics
- Radiation Effects in Electronics
- Statistical Mechanics and Entropy
- Advanced Semiconductor Detectors and Materials
- Molecular Communication and Nanonetworks
- Semiconductor materials and devices
- Advanced Fluorescence Microscopy Techniques
AGH University of Krakow
2014-2024
Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara
2017
Institute of Nuclear Physics, Polish Academy of Sciences
2014-2017
Centro Brasileiro de Pesquisas Físicas
2016-2017
The $\Xi_c^+ K^-$ mass spectrum is studied with a sample of $pp$ collision data corresponding to an integrated luminosity 3.3 fb$^{-1}$, collected by the LHCb experiment. $\Xi_c^+$ reconstructed in decay mode $p K^- \pi^+$. Five new, narrow excited $\Omega_c^0$ states are observed: $\Omega_c(3000)^0$, $\Omega_c(3050)^0$, $\Omega_c(3066)^0$, $\Omega_c(3090)^0$, and $\Omega_c(3119)^0$. Measurements their masses widths reported.
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 }$$ respectively) were performed the CERN Super Proton Synchrotron using large acceptance NA61/SHINE hadron spectrometer. Spectra are presented as function rapidity transverse momentum compared to predictions current models. The measurements...
A search for the rare decays $B_s^0\to\tau^+\tau^-$ and $B^0\to\tau^+\tau^-$ is performed using proton--proton collision data collected with LHCb detector. The sample corresponds to an integrated luminosity of 3fb$^{-1}$ in 2011 2012. $\tau$ leptons are reconstructed through decay $\tau^-\to\pi^-\pi^+\pi^-\nu_{\tau}$. Assuming no contribution from decays, upper limit set on branching fraction $\mathcal{B}(B_s^0\to\tau^+\tau^-) < 6.8\times 10^{-3}$ at 95% confidence level. If instead assumed,...
Measurements of the cross section for producing b quarks in reaction pp→b¯bX are reported 7 and 13 TeV collisions at LHC as a function pseudorapidity η range 2<η<5 covered by acceptance LHCb experiment. The measurements done using semileptonic decays b-flavored hadrons decaying into ground-state charmed hadron association with muon. sections 72.0±0.3±6.8 154.3±1.5±14.3 μb TeV. ratio is 2.14±0.02±0.13, where quoted uncertainties statistical systematic, respectively. agreement theoretical...
Abstract The LHCb upgrade represents a major change of the experiment. detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that previous periods. Readout all into all-software trigger is central new design, facilitating reconstruction events maximum LHC interaction rate, and their selection in real time. experiment's tracking system has upgraded with pixel vertex detector, silicon tracker upstream dipole magnet three...
The production cross-section of J/ψ pairs is measured using a data sample pp collisions collected by the LHCb experiment at centre-of-mass energy $$ \sqrt{s}=13 TeV, corresponding to an integrated luminosity 279 ±11 pb−1. measurement performed for mesons with transverse momentum less than 10 GeV/c in rapidity range 2.0 < y 4.5. be 15.2 ± 1.0 0.9 nb. first uncertainty statistical, and second systematic. differential cross-sections as functions several kinematic variables pair are compared...
The production of J/$ψ$ mesons is studied in proton-lead collisions at the centre-of-mass energy per nucleon pair $\sqrt{s_{\text{NN}}}=8.16$ TeV with LHCb detector LHC. double differential cross-sections prompt and nonprompt are measured as functions transverse momentum rapidity nucleon-nucleon frame. Forward-to-backward ratios nuclear modification factors determined. results compared theoretical calculations based on collinear factorisation using parton distribution functions, colour glass...
A search is presented for massive long-lived particles decaying into a muon and two quarks. The dataset consists of proton-proton interactions at centre-of-mass energies 7 8 TeV, corresponding to integrated luminosities 1 2 $$\,\hbox {fb}^{-1}$$ , respectively. analysis performed assuming set production mechanisms with simple topologies, including the Higgs-like particle particles. mass range from 20 80 $$\mathrm{{GeV}}/c^2$$ lifetimes 5 100 $${\,\mathrm{{ps}}}$$ are explored. Results also...
Production cross-sections of prompt charm mesons are measured using data from $pp$ collisions at the LHC a centre-of-mass energy $5\,$TeV. The sample corresponds to an integrated luminosity $8.60\pm0.33\,$pb$^{-1}$ collected by LHCb experiment. production $D^0$, $D^+$, $D_s^+$, and $D^{*+}$ in bins meson transverse momentum, $p_{\text{T}}$, rapidity, $y$. They cover rapidity range $2.0<y<4.5$ momentum ranges $0 < p_{\text{T}} 10\, \text{GeV}/c$ for $D^0$ $D^+$ $1 $D_s^+$ mesons. inclusive...
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> ,...
The first observation of the decays Λb0→χc1pK− and Λb0→χc2pK− is reported using a data sample corresponding to an integrated luminosity 3.0 fb−1, collected by LHCb experiment in pp collisions at center-of-mass energies 7 8 TeV. following ratios branching fractions are measured: B(Λb0→χc1pK−)B(Λb0→J/ψpK−)=0.242±0.014±0.013±0.009,B(Λb0→χc2pK−)B(Λb0→J/ψpK−)=0.248±0.020±0.014±0.009,B(Λb0→χc2pK−)B(Λb0→χc1pK−)=1.02±0.10±0.02±0.05,where uncertainty statistical, second systematic, third due on...
The $B^0$, $B^0_s$, $B^+$ and $\Lambda^0_b$ hadron production asymmetries are measured using a data sample corresponding to an integrated luminosity of 3.0 fb$^{-1}$, collected by the LHCb experiment in proton-proton collisions at centre-of-mass energies 7 8 TeV. measurements performed as function transverse momentum rapidity $b$ hadrons within detector acceptance. overall asymmetries, over rapidity, also determined.
An amplitude analysis of the decay $\Lambda_b^0\to D^0 p \pi^-$ is performed in part phase space containing resonances $D^0 p$ channel. The study based on a data sample corresponding to an integrated luminosity 3.0 fb$^{-1}$ $pp$ collisions recorded by LHCb experiment. spectrum excited $\Lambda_c^+$ states that into studied. masses, widths and quantum numbers $\Lambda_c(2880)^+$ $\Lambda_c(2940)^+$ are measured. constraints spin parity for state obtained first time. A near-threshold...
A measurement of the phase difference between short- and long-distance contributions to $B^{+}\to K^{+}μ^{+}μ^{-}$ decay is performed by analysing dimuon mass distribution. The analysis based on $pp$ collision data corresponding an integrated luminosity 3 $\rm fb^{-1}$ collected LHCb experiment in 2011 2012. contribution modelled as a sum relativistic Breit--Wigner amplitudes representing different vector meson resonances decaying muon pairs, each with their own magnitude phase. measured...
The first observation of the rare decay ${B}_{s}^{0}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and evidence for ${B}^{0}\ensuremath{\rightarrow}\ensuremath{\phi}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ are reported, using $pp$ collision data recorded by LHCb detector at center-of-mass energies $\sqrt{s}=7$ 8 TeV, corresponding to an integrated luminosity $3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. branching...
Asymmetries in the time-dependent rates of ${D}^{0}\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ and ${D}^{0}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ decays are measured a $pp$ collision data sample collected with LHCb detector during LHC Run 1, corresponding to an integrated luminosity $3\text{ }\text{ }{\mathrm{fb}}^{\ensuremath{-}1}$. The asymmetries effective decay widths between ${D}^{0}$ ${\overline{D}}^{0}$ decays, sensitive indirect...
Measurements of the $\pi^{\pm}$, $K^{\pm}$, and proton double differential yields emitted from surface 90-cm-long carbon target (T2K replica) were performed for incoming 31 GeV/c protons with NA61/SHINE spectrometer at CERN SPS using data collected during 2010 run. The $\pi^{\pm}$ measured increased precision compared to previously published results, while $K^{\pm}$ obtained first time. A strategy dealing dependence results on beam profile is proposed. purpose these measurements reduce...
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>...
Using proton-proton collision data corresponding to an integrated luminosity of 3.0 fb^{-1}, recorded by the LHCb detector at center-of-mass energies 7 and 8 TeV, B_{c}^{+}→D^{0}K^{+} decay is observed with a statistical significance 5.1 standard deviations. By normalizing B^{+}→D[over ¯]^{0}π^{+} decays, measurement branching fraction multiplied production rates for B_{c}^{+} relative B^{+} mesons in acceptance obtained,...
A search for the B0→K+K− decay is performed using pp-collision data collected by LHCb. The set corresponds to integrated luminosities of 1.0 and 2.0 fb−1 at center-of-mass energies 7 8 TeV, respectively. This observed first time, with a significance more than 5 standard deviations. analysis also results in an improved measurement branching fraction Bs0→π+π− decay. measured fractions are B(B0→K+K−)=(7.80±1.27±0.81±0.21)×10−8 B(Bs0→π+π−)=(6.91±0.54±0.63±0.19±0.40)×10−7. uncertainty...
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....
The observation of the decay $\varXi^{-}_{b}\to J/\psi\varLambda K^{-}$ is reported, using a data sample corresponding to an integrated luminosity $3~\mathrm{fb}^{-1}$, collected by LHCb detector in $pp$ collisions at centre-of-mass energies $7$ and $8~\mathrm{TeV}$. production rate $\varXi_{b}^{-}$ baryons detected $\varXi_{b}^{-}\to measured relative that $\varLambda_{b}^{0}$ $\varLambda_{b}^{0}\to J/\psi \varLambda$. Integrated over $b$-baryon transverse momentum $p_{\rm...