Klaus Barth
A5000071032- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Corporate Governance and Management
- Particle Detector Development and Performance
- Nuclear reactor physics and engineering
- Dark Matter and Cosmic Phenomena
- Digital Innovation in Industries
- Economic and Business Studies
- Statistical Methods and Bayesian Inference
- Superconducting Materials and Applications
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- Economic and Social Issues
- Spacecraft and Cryogenic Technologies
- Cosmology and Gravitation Theories
- Pulsars and Gravitational Waves Research
- Distributed and Parallel Computing Systems
- European Monetary and Fiscal Policies
- Computational Physics and Python Applications
- Stochastic processes and statistical mechanics
- X-ray Diffraction in Crystallography
- Particle accelerators and beam dynamics
- Crystallization and Solubility Studies
- Astrophysics and Cosmic Phenomena
European Organization for Nuclear Research
2016-2025
A. Alikhanyan National Laboratory
2015-2024
Kurchatov Institute
2018-2023
COMSATS University Islamabad
2023
Technical University of Munich
2021
Bogolyubov Institute for Theoretical Physics
2015-2016
Klinikum Leverkusen
2015
Linde (United States)
2012
Fermi National Accelerator Laboratory
2012
Cryogenic Industries (United States)
2012
The pseudorapidity density of charged particles ($\mathrm{d}N_\mathrm{ch}/\mathrm{d}\eta$) at mid-rapidity in Pb-Pb collisions has been measured a center-of-mass energy per nucleon pair $\sqrt{s_{\rm NN}}$ = 5.02 TeV. It increases with centrality and reaches value $1943 \pm 54$ $|\eta|<0.5$ for the 5% most central collisions. A rise $\mathrm{d}N_\mathrm{ch}/\mathrm{d}\eta$ as function is observed, steeper than that observed proton-proton following trend established by measurements lower...
Direct photon production at mid-rapidity in Pb-Pb collisions $\sqrt{s_{_{\mathrm{NN}}}} = 2.76$ TeV was studied the transverse momentum range $0.9 < p_\mathrm{T} 14$ GeV$/c$. Photons were detected with highly segmented electromagnetic calorimeter PHOS and via conversions ALICE detector material $e^+e^-$ pair reconstructed central tracking system. The results of two methods combined direct spectra measured for 0-20%, 20-40%, 40-80% centrality classes. For all three classes, agreement found...
We report the first results of elliptic ($v_2$), triangular ($v_3$) and quadrangular flow ($v_4$) charged particles in Pb-Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV with ALICE detector CERN Large Hadron Collider. The measurements are performed central pseudorapidity region $|\eta|<0.8$ for transverse momentum range $0.2<p_{\rm T}<5$ GeV/$c$. anisotropic is measured using two-particle correlations a gap greater than one unit multi-particle cumulant method. Compared to from NN}}=2.76$ TeV,...
The production of the hypertriton nuclei $^{3}_{\Lambda}\mathrm H$ and $^{3}_{\bar{\Lambda}} \overline{\mathrm H}$ has been measured for first time in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV with ALICE experiment LHC energies. total yield, d$N$/d$y$ $\times \mathrm{B.R.}_{\left( ^{3}_{\Lambda}\mathrm H \rightarrow ^{3}\mathrm{He},\pi^{-} \right)} \left( 3.86 \pm 0.77 (\mathrm{stat.}) 0.68 (\mathrm{syst.})\right) \times 10^{-5}$ 0-10% most central collisions, is consistent...
Abstract One of the key challenges for nuclear physics today is to understand from first principles effective interaction between hadrons with different quark content. First successes have been achieved using techniques that solve dynamics quarks and gluons on discrete space-time lattices 1,2 . Experimentally, strong studied by scattering off each other. Such experiments are difficult or impossible unstable 3–6 so high-quality measurements exist only containing up down 7 Here we demonstrate...
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...
Abstract A Large Ion Collider Experiment (ALICE) has been conceived and constructed as a heavy-ion experiment at the LHC. During LHC Runs 1 2, it produced wide range of physics results using all collision systems available In order to best exploit new opportunities opening up with upgraded detector technologies, undergone major upgrade during Long Shutdown 2 (2019–2022). This comprises move continuous readout, complete overhaul core detectors, well online event processing farm redesigned...
We report the measurements of correlations between event-by-event fluctuations amplitudes anisotropic flow harmonics in nucleus-nucleus collisions, obtained for first time using a new analysis method based on multiparticle cumulants mixed harmonics. This novel is robust against systematic biases originating from nonflow effects and by construction any dependence symmetry planes eliminated. demonstrate that exhibit better sensitivity to medium properties than individual The are performed...
The multi-strange baryon yields in PbPb collisions have been shown to exhibit an enhancement relative pp reactions. In this work, Ξ and Ω production rates measured with the ALICE experiment as a function of transverse momentum, pT, pPb at centre-of-mass energy sNN=5.02 TeV. results cover kinematic ranges 0.6 GeV/c<pT<7.2 GeV/c 0.8 GeV/c<pT<5 GeV/c, for respectively, common rapidity interval −0.5<yCMS<0. Multi-strange baryons identified by reconstructing their weak decays into charged...
The production of prompt charmed mesons D0, D+ and D∗+, their antiparticles, was measured with the ALICE detector in Pb-Pb collisions at centre-of-mass energy per nucleon pair, $$ \sqrt{s_{\mathrm{NN}}} , 2.76 TeV. yields for rapidity |y| < 0.5 are presented as a function transverse momentum, p T, interval 1–36 GeV/c centrality class 0–10% 1–16 30–50%. nuclear modification factor R AA computed using proton-proton reference \sqrt{s}=2.76 TeV, based on measurements \sqrt{s}=7 TeV theoretical...
The production of charged pions, kaons and (anti)protons has been measured at mid-rapidity ($-0.5 < y 0$) in p-Pb collisions $\sqrt{s_{\rm NN}}=5.02$ TeV using the ALICE detector LHC. Exploiting particle identification capabilities high transverse momentum ($p_{\rm T}$), previously published $p_{\rm T}$ spectra have extended to include measurements up 20 GeV/$c$ for seven event multiplicity classes. pp $\sqrt{s}=7$ TeV, needed interpolate a reference spectrum, also measure nuclear...
Transverse momentum $({p}_{\mathrm{T}})$ spectra of pions, kaons, and protons up to ${p}_{\mathrm{T}}=20\phantom{\rule{0.28em}{0ex}}\text{GeV}/c$ have been measured in Pb-Pb collisions at $\sqrt{{s}_{\mathit{NN}}}=2.76\phantom{\rule{0.28em}{0ex}}\text{TeV}$ using the ALICE detector for six different centrality classes covering 0%--80%. The proton-to-pion kaon-to-pion ratios both show a distinct peak ${p}_{\mathrm{T}}\ensuremath{\approx}3\phantom{\rule{0.28em}{0ex}}\text{GeV}/c$ central that...
The pseudorapidity ($η$) and transverse-momentum ($p_{\rm T}$) distributions of charged particles produced in proton-proton collisions are measured at the centre-of-mass energy $\sqrt{s}$ = 13 TeV. distribution $|η|
The first measurements of anisotropic flow coefficients $v_{\rm{n}}$ for mid-rapidity charged particles in Xe-Xe collisions at $\sqrt{s_{\rm{NN}}} = 5.44$ TeV are presented. Comparing these to those from Pb-Pb 5.02$ TeV, $v_{2}$ is found be suppressed mid-central the same centrality, and enhanced central collisions. values $v_{3}$ generally larger than a given centrality. These observations consistent with expectations hydrodynamic predictions. When both divided by their corresponding...
We report on the first measurement of an excess in yield $J/\ensuremath{\psi}$ at very low transverse momentum (${p}_{T}<0.3\text{ }\text{ }\mathrm{GeV}/c$) peripheral hadronic Pb-Pb collisions $\sqrt{{s}_{\mathrm{NN}}}=2.76\text{ }\mathrm{TeV}$, performed by ALICE CERN LHC. Remarkably, measured nuclear modification factor rapidity range $2.5<y<4$ reaches about 7 (2) ${p}_{T}$ $0--0.3\text{ }\mathrm{GeV}/c$ 70%--90% (50%--70%) centrality class. The production cross section associated with...
The production cross sections for prompt charmed mesons $$\mathrm{D^0}$$ , $$\mathrm{D^+}$$ $$\mathrm{D^{*+}}$$ and $$\mathrm{D_s^+}$$ were measured at mid-rapidity in proton–proton collisions a centre-of-mass energy $$\sqrt{s}=7~{\mathrm {TeV}}$$ with the ALICE detector Large Hadron Collider (LHC). D reconstructed from their decays $$\mathrm{D}^0 \rightarrow \mathrm{K}^-\pi ^+$$ $$\mathrm{D}^+\rightarrow ^+\pi $$\mathrm{D}^{*+} \mathrm{D}^0 \pi $$\mathrm{D_s^{+}\rightarrow \phi...
Measurements of anisotropic flow coefficients (v_{n}) and their cross-correlations using two- multiparticle cumulant methods are reported in collisions pp at sqrt[s]=13 TeV, p-Pb a center-of-mass energy per nucleon pair sqrt[s_{NN}]=5.02 Xe-Xe sqrt[s_{NN}]=5.44 Pb-Pb TeV recorded with the ALICE detector. The multiplicity dependence v_{n} is studied very wide range from 20 to 3000 particles produced midrapidity region |η|<0.8 for transverse momentum 0.2<p_{T}<3.0 GeV/c. An ordering...
The production of K$^{*}(892)^{0}$ and $\phi(1020)$ mesons in proton-proton (pp) lead-lead (Pb-Pb) collisions at $\sqrt{s_\mathrm{NN}} =$ 2.76 TeV has been analyzed using a high luminosity data sample accumulated 2011 with the ALICE detector Large Hadron Collider (LHC). Transverse momentum ($p_{\mathrm{T}}$) spectra have measured for via their hadronic decay channels $p_{\mathrm{T}}$ up to 20 GeV/$c$. measurements pp compared model calculations used determine nuclear modification factor...
A detailed study of pseudorapidity densities and multiplicity distributions primary charged particles produced in proton–proton collisions, at $$\sqrt{s} =$$ 0.9, 2.36, 2.76, 7 8 TeV, the range $$|\eta |<2$$ , was carried out using ALICE detector. Measurements were obtained for three event classes: inelastic, non-single diffractive events with least one particle interval |<1$$ . The use an improved track-counting algorithm combined ALICE's measurements processes allows a higher precision...
We report on the first femtoscopic measurement of baryon pairs, such as p-p, p-$\Lambda$ and $\Lambda$-$\Lambda$, measured by ALICE at Large Hadron Collider (LHC) in proton-proton collisions $\sqrt{s}$ = 7 TeV. This study demonstrates feasibility measurements pp ultrarelativistic energies. The femtoscopy method is employed to constrain hyperon-nucleon hyperon-hyperon interactions, which are still rather poorly understood. A new evaluate influence residual correlations induced decays...
The production of K $$^{*}$$ (892) $$^{0}$$ and $$\phi $$ (1020) mesons has been measured in p–Pb collisions at $$\sqrt{s_{{\text {NN}}}}$$ $$=$$ 5.02 TeV. $$^{*0}$$ are reconstructed via their decay into charged hadrons with the ALICE detector rapidity range $$-0.5 <y <0$$ . transverse momentum spectra, as a function multiplicity, have p $$_{\mathrm {T}}$$ from 0 to 15 GeV/c for 0.3 21 Integrated yields, mean momenta particle ratios reported compared results pp $$\sqrt{s}$$ 7 TeV Pb–Pb 2.76...
Invariant differential yields of deuterons and anti-deuterons in pp collisions at $\sqrt{s}$ = 0.9, 2.76 7 TeV the tritons, $^{3}$He nuclei their anti-nuclei have been measured with ALICE detector CERN Large Hadron Collider. The measurements cover a wide transverse momentum ($p_{\text{T}}$) range rapidity interval $|y|<0.5$, extending both energy $p_{\text{T}}$ reach previous up to 3 GeV/$c$ for $A=2$ 6 $A=3$. coalescence parameters (anti-)deuterons $^{3}\overline{\text{He}}$ exhibit an...
A bstract Measurements of anisotropic flow coefficients with two- and multi-particle cumulants for inclusive charged particles in Pb-Pb collisions at $$ \sqrt{s_{\mathrm{NN}}}=5.02 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:msub> <mml:mi>s</mml:mi> <mml:mrow> <mml:mi>N</mml:mi> </mml:mrow> </mml:msub> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>5.02</mml:mn> </mml:math> 2.76 TeV are reported the pseudorapidity range | η < 0.8 transverse momentum 0.2 p T 50 GeV/...
This work presents new constraints on the existence and binding energy of a possible $\Lambda$-$\Lambda$ bound state, H-dibaryon, derived from femtoscopic measurements by ALICE collaboration. The results are obtained measurement using femtoscopy technique in pp collisions at $\sqrt{s}=13$ TeV p-Pb $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV, combined with previously published $\sqrt{s}=7$ TeV. scattering parameter space, spanned inverse length $f_0^{-1}$ effective range $d_0$, is constrained comparing...
We present the charged-particle pseudorapidity density in Pb–Pb collisions at sNN=5.02TeV centrality classes measured by ALICE. The measurement covers a wide range from −3.5 to 5, which is sufficient for reliable estimates of total number charged particles produced collisions. For most central (0–5%) we find 21400±1300, while peripheral (80–90%) 230±38. This corresponds an increase (27±4)% over results sNN=2.76TeV previously reported energy dependence heavy-ion found obey modified power-law...