K. Piotrzkowski
A5002408549- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Computational Physics and Python Applications
- Neutrino Physics Research
- Gamma-ray bursts and supernovae
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Astrophysical Phenomena and Observations
- Medical Imaging Techniques and Applications
- Geophysics and Gravity Measurements
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Atomic and Subatomic Physics Research
- Distributed and Parallel Computing Systems
- High-pressure geophysics and materials
- CCD and CMOS Imaging Sensors
- Nuclear reactor physics and engineering
- Cold Atom Physics and Bose-Einstein Condensates
- Radio Astronomy Observations and Technology
AGH University of Krakow
2022-2025
Jagiellonian University
2025
UCLouvain
2015-2024
University of Wisconsin–Milwaukee
2022
European Organization for Nuclear Research
2001-2021
Institute of High Energy Physics
2011-2020
Florida State University
2016
A. Alikhanyan National Laboratory
2014
Austrian Academy of Sciences
2012-2013
Catholic University of America
2009-2012
CMS is a general purpose experiment, designed to study the physics of pp collisions at 14 TeV Large Hadron Collider (LHC). It currently involves more than 2000 physicists from 150 institutes and 37 countries. The LHC will provide extraordinary opportunities for particle based on its unprecedented collision energy luminosity when it begins operation in 2007.
Results on two-particle angular correlations for charged particles emitted in proton-proton collisions at center-of-mass energies of 0.9, 2.36, and 7 TeV are presented, using data collected with the CMS detector over a broad range pseudorapidity (eta) azimuthal angle (phi). Short-range Delta(eta), which studied minimum bias events, characterized simple "independent cluster" parametrization order to quantify their strength (cluster size) extent eta decay width). Long-range differentially as...
At the Large Hadron Collider, identification of jets originating from b quarks is important for searches new physics and measurements standard model processes. A variety algorithms has been developed by CMS to select b-quark based on variables such as impact parameters charged-particle tracks, properties reconstructed decay vertices, presence or absence a lepton, combinations thereof. The performance these measured using data proton-proton collisions at LHC compared with expectations...
Charged-hadron transverse-momentum and pseudorapidity distributions in proton-proton collisions at $\sqrt{s}=7\text{ }\text{ }\mathrm{TeV}$ are measured with the inner tracking system of CMS detector LHC. The charged-hadron yield is obtained by counting number reconstructed hits, hit pairs, fully charged-particle tracks. combination three methods gives a multiplicity per unit...
This report presents the capabilities of CMS experiment to explore rich heavy-ion physics programme offered by CERN Large Hadron Collider (LHC). The collisions lead nuclei at energies , will probe quark and gluon matter unprecedented values energy density. prime goal this research is study fundamental theory strong interaction — Quantum Chromodynamics (QCD) in extreme conditions temperature, density parton momentum fraction (low-x).
Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at $\sqrt{s} = 0.9 $ 2.36 TeV. The data were collected with the CMS detector during LHC commissioning in December 2009. For non-single-diffractive interactions, average transverse momentum is measured to be 0.46 ± 0.01 (stat.) (syst.) GeV/c TeV 0.50 TeV, pseudorapidities between --2.4 +2.4. At these energies, densities central region, dN ch/dη||η|<0.5, 3:48...
The first LHC pp collisions at centre-of-mass energies of 0.9 and 2.36 TeV were recorded by the CMS detector in December 2009. trajectories charged particles produced reconstructed using all-silicon Tracker their momenta measured 3.8 T axial magnetic field. Results from commissioning are presented including studies timing, efficiency, signal-to-noise, resolution, ionization energy. Reconstructed tracks used to benchmark performance terms track vertex resolutions, reconstruction decays,...
Proton–nucleus (p+A) collisions have long been recognized as a crucial component of the physics program with nuclear beams at high energies, in particular for their reference role to interpret and understand nucleus–nucleus data well potential elucidate partonic structure matter low parton fractional momenta (small-x). Here, we summarize main motivations that make proton–nucleus run decisive ingredient successful heavy-ion Large Hadron Collider (LHC) present unique scientific opportunities...
We present the FP420 R&D project, which has been studying key aspects of development and installation a silicon tracker fast-timing detectors in LHC tunnel at 420 m from interaction points ATLAS CMS experiments. These would measure precisely very forward protons conjunction with corresponding central as means to study Standard Model (SM) physics, search for characterise new physics signals. This report includes detailed description case detector and, particular, measurement Central Exclusive...
Signals consistent with the B_{c}^{+}(2S) and B_{c}^{*+}(2S) states are observed in proton-proton collisions at sqrt[s]=13 TeV, an event sample corresponding to integrated luminosity of 143 fb^{-1}, collected by CMS experiment during 2015-2018 LHC running periods. These excited b[over ¯]c B_{c}^{+}π^{+}π^{-} invariant mass spectrum, ground state B_{c}^{+} reconstructed through its decay J/ψπ^{+}. The two as well-resolved peaks, separated 29.1±1.5(stat)±0.7(syst) MeV. observation rather than...
Measurements of the top quark polarization and pair ($t\overline{t}$) spin correlations are presented using events containing two oppositely charged leptons (${e}^{+}{e}^{\ensuremath{-}}$, ${e}^{\ifmmode\pm\else\textpm\fi{}}{\ensuremath{\mu}}^{\ensuremath{\mp}}$, or ${\ensuremath{\mu}}^{+}{\ensuremath{\mu}}^{\ensuremath{-}}$) produced in proton-proton collisions at a center-of-mass energy 13 TeV. The data were recorded by CMS experiment LHC 2016 correspond to an integrated luminosity...
Next-to-leading-order QCD analyses of the ZEUS data on deep inelastic scattering together with fixed-target have been performed, from which gluon and quark densities proton value strong coupling constant αs(MZ) were extracted. The study includes a full treatment experimental systematic uncertainties including point-to-point correlations. resulting in parton density functions are presented. A combined fit for yields agreement world average. derived alone indicate importance HERA determining...
A search for anomalous electroweak production of WW, WZ, and ZZ boson pairs in association with two jets proton-proton collisions at $\sqrt{s} =$ 13 TeV the LHC is reported. The data sample corresponds to an integrated luminosity 35.9 fb$^{-1}$ collected CMS detector. Events are selected by requiring large rapidity separation invariant mass, one or leptons (electrons muons), a W Z decaying hadronically. No excess events respect standard model background predictions observed constraints on...
The differential cross sections of $\Lambda_\mathrm{c}^+$ baryon production are measured via the exclusive decay channel $\to$ pK$^-\pi^+$ using CMS detector at LHC. Spectra as a function transverse momentum ($p_\mathrm{T}$) in proton-proton (pp) and lead-lead (PbPb) collisions nucleon-nucleon center-of-mass energy 5.02 TeV. measurement is performed within rapidity interval $|y|$ $<$ 1.0 $p_\mathrm{T}$ range 5-20 GeV/$c$ pp 10-20 PbPb collisions. observed yields for suggest possible...
Tagging two-photon interactions offers a significant extension of the CERN LHC physics program. The effective luminosity high-energy $\ensuremath{\gamma}\ensuremath{\gamma}$ collisions reaches 1% proton-proton luminosity. standard detector techniques used for measuring very forward proton scattering will allow reliable separation interesting interactions. Particularly exciting is possibility detecting exclusive Higgs boson production via fusion.
A measurement of the underlying activity in scattering processes with transverse momentum scale GeV region is performed proton-proton collisions at sqrt(s) = 0.9 TeV, using data collected by CMS experiment LHC. Charged hadron production studied reference to direction a leading object, either charged particle or set particles forming jet. Predictions several QCD-inspired models as implemented PYTHIA are compared, after full detector simulation, data. The generally predict too little hadrons...
Inclusive jet differential cross sections have been measured in neutral current deep inelastic e+p scattering for boson virtualities Q2>125 GeV2. The data were taken using the ZEUS detector at HERA and correspond to an integrated luminosity of 38.6 pb−1. Jets identified Breit frame longitudinally invariant kT cluster algorithm. Measurements inclusive are presented as functions transverse energy (EBT,jet), pseudorapidity Q2, jets with EBT,jet>8 GeV. Next-to-leading-order QCD calculations...
Bose-Einstein correlations have been measured using samples of proton-proton collisions at 0.9 and 2.36 TeV center-of-mass energies, recorded by the CMS experiment CERN Large Hadron Collider. The signal is observed in form an enhancement pairs same-sign charged particles with small relative four-momentum. size correlated particle emission region seen to increase significantly multiplicity event.
The exclusive production of ϱ0 mesons in deep inelastic electron-proton scattering has been studied using the ZEUS detector. Cross sections have measured range 7 < Q2 25 GeV2 for λ∗p centre mass (c.m.) energies 40 to 130 GeV. → ϱ0p cross section exhibits a Q−(4.2±0.8−0.5+1.4) dependence and both longitudinally transversely polarised ϱ0's are observed. rises strongly with increasing c.m. energy, when compared NMC data at lower which cannot be explained by through soft pomeron exchange....