T. S. Tveter
A5051915591- High-Energy Particle Collisions Research
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Nuclear reactor physics and engineering
- Nuclear physics research studies
- Cosmology and Gravitation Theories
- Dark Matter and Cosmic Phenomena
- Statistical Methods and Bayesian Inference
- Neutrino Physics Research
- CCD and CMOS Imaging Sensors
- Radiation Detection and Scintillator Technologies
- Pulsars and Gravitational Waves Research
- Advanced NMR Techniques and Applications
- Superconducting Materials and Applications
- Stochastic processes and statistical mechanics
- Scientific Research and Discoveries
- Computational Physics and Python Applications
- Theoretical and Computational Physics
- Chemical and Physical Properties of Materials
- Photocathodes and Microchannel Plates
- Pediatric Urology and Nephrology Studies
- Surface and Thin Film Phenomena
- Electrochemical Analysis and Applications
- advanced mathematical theories
University of Oslo
2015-2025
A. Alikhanyan National Laboratory
2014-2024
Financiadora de Estudos e Projetos
2023
National Council for Scientific and Technological Development
2023
National Nuclear Research Center
2023
University of Applied Sciences Worms
2019
Istituto Nazionale di Fisica Nucleare, Sezione di Roma I
2019
Indonesian Institute of Sciences
2019
Western Norway University of Applied Sciences
2019
University of Trieste
2019
We present spectra of charged hadrons from $\mathrm{A}\mathrm{u}+\mathrm{A}\mathrm{u}$ and $d+\mathrm{A}\mathrm{u}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\mathrm{G}\mathrm{e}\mathrm{V}$ measured with the BRAHMS experiment RHIC. The for different collision centralities are compared to $p+\overline{p}$ same energy scaled by number binary collisions. resulting ratios (nuclear modification factors) central $\ensuremath{\eta}=0$ $\ensuremath{\eta}=2.2$ evidence a strong suppression in high...
The first measurements of ${x}_{F}$-dependent single-spin asymmetries identified charged hadrons, ${\ensuremath{\pi}}^{\ifmmode\pm\else\textpm\fi{}}$, ${K}^{\ifmmode\pm\else\textpm\fi{}}$, and protons, from transversely polarized proton-proton collisions at 62.4 GeV RHIC are presented. Large seen in the pion kaon channels. inclusive ${\ensuremath{\pi}}^{+}$ production, ${A}_{N}({\ensuremath{\pi}}^{+})$, increase with ${x}_{F}$ 0 to $\ensuremath{\sim}0.25$...
Transverse momentum spectra and rapidity densities, dN/dy, of protons, antiprotons, net protons (p−p¯) from central (0%–5%) Au+Au collisions at sNN=200 GeV were measured with the BRAHMS experiment within range 0≤y≤3. The proton antiproton dN/dy decrease midrapidity to y=3. net-proton yield is roughly constant for y<1 dN/dy∼7, increases dN/dy∼12 y∼3. data show that this energy exhibit a high degree transparency linear scaling loss observed lower energies broken. per participant nucleon...
Results are presented on hyperon and antihyperon production in Pb–Pb, pPb pBe collisions at 158 GeV/c per nucleon. Λ, Ξ Ω yields have been measured central rapidity medium transverse momentum as functions of the centrality collision. Comparing Pb–Pb to those interactions, strangeness enhancement is observed. The increases with content hyperons, reaching a factor about 20 for collisions.
We present particle spectra for charged hadrons π±, K±, p, and p¯ from pp collisions at s=200 GeV measured the first time forward rapidities (2.95 3.3). The kinematics of these measurements are skewed in a way that probes small momentum fraction one protons large fractions other. Large proton to pion ratios observed values transverse extend up 4 GeV/c, where have momenta 35 GeV. Next-to-leading order perturbative QCD calculations describe production pions kaons well rapidities, but fail...
Transverse momentum spectra of protons and anti-protons measured in the rapidity range 0<y<3.1 from 0-10% central Au+Au collisions at sqrt{s_{NN}}=62.4 GeV are presented. The densities, dN/dy, protons, net-protons N()p-N(pbar) have been deduced over a wide enough to observe expected maximum net-baryon density. From mid-rapidity y=1 net-proton yield is roughly constant (dN/dy ~ 10),but rises dN/dy ~25 2.3<y<3.1. mean loss 2.01 +-0.16 units beam rapidity. distributions compared model...
We present ratios of the numbers charged antiparticles to particles (pions, kaons and protons) in Au + collisions at $\sqrt{s_{NN}}=200$ GeV as a function rapidity range $y$=0-3. While particle midrapidity are approaching unity, $K^-/K^+$ $\bar{p}/p$ decrease significantly forward rapidities. An interpretation results within statistical model indicates reduction baryon chemical potential from $\mu_B \approx 130$MeV $y$=3 25$MeV $y$=0.
Particle production of identified charged hadrons, $\pi^{\pm}$, $K^{\pm}$, $p$, and $\bar{p}$ in Au+Au collisions at $\sqrt(snn) =$ 200 GeV has been studied as a function transverse momentum collision centrality $y=0$ $y\sim1$ by the BRAHMS experiment RHIC. Significant collective flow kinetic freeze-out observed collisions. The magnitude rises with centrality. Proton kaon yields relative to pion increase strongly increases also per participant nucleon show weak dependence on for all particle...
A measurement of strange baryon and antibaryon production in Pb-Pb collisions has been carried out by the NA57 experiment at CERN SPS, with 40 158 GeV/c beam momentum. Results on $Λ$, $Ξ$ $Ω$ hyperon yields mid-rapidity most central 53% are presented compared those obtained higher energy, same collision centrality range. The $Λ$ $Ξ^-$ per unit rapidity stay roughly constant while $Ω^-$, $\barΛ$, $\barΞ^+$ $\barΩ^+$ increase when going to SPS energy. Hyperon from STAR $\sqrt{s_{NN}}$ = 130...
Charged-particle pseudorapidity densities are presented for the d+Au reaction at √sNN=200 GeV with −4.2≤η≤4.2. The results, from BRAHMS experiment BNL Relativistic Heavy-Ion Collider, shown minimum-bias events and 0%–30%, 30%–60%, 60%–80% centrality classes. Models incorporating both soft physics hard, perturbative QCD-based scattering agree well experimental results. data do not support predictions based on strong-coupling, semiclassical QCD. In deuteron-fragmentation region central 200...
We present a measurement of pi-\pi+, K-/K+ and pbar/p from p+p collisions at sqrt(s) = 20 0GeV over the rapidity range 0<y<3.4. For pT < 2.0 GeV/c we see no significant transverse momentum dependence ratios. All three ratios are independent for y ~< 1.5 then steadily decline ~ to 3. The pi-\pi+ ratio is below unity > 2.0. very similar 20% central Au+Au all rapidities. In fragmentation region seem be beam energy when viewed rest frame one protons. Theoretical models based on quark-diquark...
We have measured the distributions of protons and deuterons produced in 20% most central $\mathrm{Au}+\mathrm{Au}$ collisions at Relativistic Heavy-Ion Collider (RHIC) ($\sqrt{{s}_{{}_{\mathrm{NN}}}}=200$ GeV) over a very wide range transverse longitudinal momentum. Near midrapidity we also distribution antiprotons antideuterons. present our results context coalescence models. In particular, extract ``homogeneity volume'' average phase-space density for antiprotons. rapidity parameter...
The procedure employed by the WA97 and NA57 experiments to determine number of wounded nucleons in different Pb + centrality classes is discussed. We will also compare scales their influence on measurement dependence strange particle yields.
Experiment NA57 studies the production of strange and multi-strange baryons antibaryons in ultrarelativistic nucleus-nucleus collisions at SPS. The principal aim is to investigate existence an onset for strangeness enhancement effect variation energy centrality (i.e. number participants) collisions. experiment was successfully installed commissioned 1997.
We present spectra of charged pions and protons in 0–10% central Au + collisions at sNN=200GeV mid-rapidity (y=0) forward pseudorapidity (η=2.2) measured with the BRAHMS experiment RHIC. The are compared to from p+p same energy scaled by number binary collisions. resulting nuclear modification factors for both y=0 η=2.2 exhibit suppression but not (anti-) intermediate pT. p¯/π− ratios have been up pT∼3GeV/c two rapidities results indicate that a significant fraction hadrons produced pT range η=2.2.
The on-line event reconstruction in ALICE is performed by the High Level Trigger, which should process up to 2000 events per second proton-proton collisions and 200 central heavy-ion collisions, corresponding an input data stream of 30 GB/s. In order fulfil time requirements, a fast tracker has been developed can optionally use GPU hardware accelerators. algorithm combines Cellular Automaton method being used for pattern recognition Kalman Filter fit found trajectories final track selection....