A5106892454- 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
- Radiation Detection and Scintillator Technologies
- Superconducting Materials and Applications
- Neutrino Physics Research
- Particle Accelerators and Free-Electron Lasers
- Nuclear physics research studies
- Nuclear reactor physics and engineering
- Cold Atom Physics and Bose-Einstein Condensates
- Muon and positron interactions and applications
- Nuclear Physics and Applications
- Particle accelerators and beam dynamics
- Methane Hydrates and Related Phenomena
- Geochemistry and Geologic Mapping
- Theoretical and Computational Physics
- Quantum Mechanics and Applications
- Computational Physics and Python Applications
- Pulsars and Gravitational Waves Research
- Conducting polymers and applications
- Bayesian Methods and Mixture Models
- International Science and Diplomacy
- Cellular Automata and Applications
LIP - Laboratory of Instrumentation and Experimental Particle Physics
2016-2025
University of Aveiro
2017-2023
University of Giessen
2021
European Organization for Nuclear Research
2007-2020
University of Coimbra
2017-2020
Slovak Academy of Sciences
2018-2019
Institute of Physics of the Slovak Academy of Sciences
2018-2019
Jagiellonian University
2017
Institute of Physics
2017
Fundação para a Ciência e Tecnologia
2008-2015
The COMPASS Collaboration at CERN has measured the transverse spin azimuthal asymmetry of charged hadrons produced in semi-inclusive deep inelastic scattering using a 160 GeV μ+ beam and transversely polarised NH3 target. Sivers proton been extracted Bjorken x range 0.003<x<0.7. new measurements have small statistical systematic uncertainties few percent confirm with considerably better accuracy previous measurement. is found to be compatible zero for negative positive hadrons, clear...
The first measurement of transverse-spin-dependent azimuthal asymmetries in the pion-induced Drell-Yan (DY) process is reported. We use CERN SPS 190 GeV/c π^{-} beam and a transversely polarized ammonia target. Three giving access to different transverse-momentum-dependent (TMD) parton distribution functions (PDFs) are extracted using dimuon events with invariant mass between 4.3 GeV/c^{2} 8.5 GeV/c^{2}. Within experimental uncertainties, observed sign Sivers asymmetry found be consistent...
A bstract Heavy Neutral Leptons (HNLs) are hypothetical particles predicted by many extensions of the Standard Model. These can, among other things, explain origin neutrino masses, generate observed matter-antimatter asymmetry in Universe and provide a dark matter candidate. The SHiP experiment will be able to search for HNLs produced decays heavy mesons travelling distances ranging between $$ \mathcal{O} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>O</mml:mi>...
New results for the double spin asymmetry A1p and proton longitudinal structure function g1p are presented. They were obtained by COMPASS Collaboration using polarised 200 GeV muons scattered off a longitudinally NH3 target. The data collected in 2011 complement those recorded 2007 at 160 GeV, particular lower values of x. improve statistical precision g1p(x) about factor two region x≲0.02. A next-to-leading order QCD fit to g1 world is performed. It leads new determination quark...
Measurements of the Collins and Sivers asymmetries for charged pions neutral kaons produced in semi-inclusive deep-inelastic scattering high energy muons off transversely polarised protons are presented. The results were obtained using all available COMPASS proton data, which taken years 2007 2010. exhibit valence region a non-zero signal there hints also kaons. found to be positive compatible with zero otherwise.
We present an analysis of proton number fluctuations in $\sqrt{s_{NN}}$ = 2.4 GeV Au+Au collisions measured with the High-Acceptance DiElectron Spectrometer (HADES) at GSI. With help extensive detector simulations done IQMD transport model events including nuclear clusters, various nuisance effects influencing observed cumulants have been investigated. Acceptance and efficiency corrections applied as a function fine grained rapidity transverse momentum bins, well considering local track...
First measurements of azimuthal asymmetries in hadron-pair production deep-inelastic scattering muons on transversely polarised ^6LiD (deuteron) and NH_3 (proton) targets are presented. The data were taken the years 2002-2004 2007 with COMPASS spectrometer using a muon beam 160 GeV/c at CERN SPS. provide access to transversity distribution functions, without involving Collins effect as single hadron production. sizeable measured NH_ target indicate non-vanishing u-quark two-hadron...
Spin-averaged asymmetries in the azimuthal distributions of positive and negative hadrons produced deep inelastic scattering were measured using CERN SPS muon beam at $160$ GeV/c a $^6$LiD target. The amplitudes three modulations $\cos\phi_h$, $\cos2\phi_h$ $\sin\phi_h$ obtained binning data separately each relevant kinematic variables $x$, $z$ or $p_T^{\,h}$ three-dimensional grid these variables. $\cos \phi_h$ 2\phi_h$ show strong dependencies both for hadrons.
The main characteristics of the COMPASS experimental setup for physics with hadron beams are described. This was designed to perform exclusive measurements processes several charged and/or neutral particles in final state. Making use a large part apparatus that previously built spin structure studies muon beam, it also features new target system as well or upgraded detectors. is able operate at high incident flux available CERN. It characterised by angular and momentum coverages, nearly flat...
A measurement of the azimuthal asymmetry in dihadron production deep-inelastic scattering muons on transversely polarised proton (NH$_{3}$) targets are presented. They provide independent access to transversity distribution functions through Collins single hadron production. The data were taken year $2010$ with COMPASS spectrometer using a $160\,\mbox{GeV}/c$ muon beam CERN SPS, increasing by factor about three available statistics previously published $2007$. measured sizeable is good...
The COMPASS collaboration at CERN has measured diffractive dissociation of 190 GeV/$c$ pions into the $\pi^-\pi^-\pi^+$ final state using a stationary hydrogen target. A partial-wave analysis (PWA) was performed in bins $3\pi$ mass and four-momentum transfer isobar model so far largest PWA consisting 88 waves. narrow $J^{PC} = 1^{++}$ signal is observed $f_0(980)\,\pi$ channel. We present resonance-model study subset spin-density matrix selecting states with 2^{++}$ $4^{++}$ decaying...
We have performed the most comprehensive resonance-model fit of $\pi^-\pi^-\pi^+$ states using results our previously published partial-wave analysis (PWA) a large data set diffractive-dissociation events from reaction $\pi^- + p \to \pi^-\pi^-\pi^+ p_\text{recoil}$ with 190 GeV/$c$ pion beam. The PWA results, which were obtained in 100 bins three-pion mass, $0.5 < m_{3\pi} 2.5$ GeV/$c^2$, and simultaneously 11 reduced four-momentum transfer squared, $0.1 t' 1.0$ $($GeV$/c)^2$, are subjected...
Exclusive production of $\eta\pi^-$ and $\eta'\pi^-$ has been studied with a $191\,\textrm{GeV}/c$ $\pi^-$ beam impinging on hydrogen target at COMPASS (CERN). Partial-wave analyses reveal different odd/even angular momentum ($L$) characteristics in the inspected invariant mass range up to $3\,\textrm{GeV}/c^2$. A striking similarity between two systems is observed for $L=2,4,6$ intensities (scaled by kinematical factors) relative phases. The known resonances $a_2(1320)$ $a_4(2040)$ are line...
Flow coefficients $v_{n}$ of the orders $n = 1 - 6$ are measured with High-Acceptance DiElectron Spectrometer (HADES) at GSI for protons, deuterons and tritons as a function centrality, transverse momentum rapidity in Au+Au collisions $\sqrt{s_{NN}} 2.4$ GeV. Combining information from flow all allows to construct first time, collision energies few GeV, multi-differential picture angular emission pattern these particles. It reflects complicated interplay between effect central fireball...
A semi-inclusive measurement of charged hadron multiplicities in deep inelastic muon scattering off an isoscalar target was performed using data collected by the COMPASS Collaboration at CERN. The following kinematic domain is covered data: photon virtuality ${Q}^{2}>1\text{ }\text{ }(\mathrm{GeV}/c{)}^{2}$, invariant mass hadronic system $W>5\text{ }\mathrm{GeV}/{c}^{2}$, Bjorken scaling variable range $0.003<x<0.4$, fraction virtual energy carried $0.2<z<0.8$, and square transverse...
This paper presents a fast approach to simulating muons produced in interactions of the SPS proton beams with target SHiP experiment. The experiment will be able search for new long-lived particles 400 GeV/c beam dump and which travel distances between fifty metres tens kilometers. detector needs operate under ultra-low background conditions requires large simulated samples muon induced processes. Through use Generative Adversarial Networks it is possible emulate simulation interaction...
The Search for Hidden Particles (SHiP) Collaboration has shown that the CERN SPS accelerator with its 400 GeV/c proton beam offers a unique opportunity to explore Sector [1–3]. proposed experiment is an intensity frontier which capable of searching hidden particles through both visible decays and scattering signatures from recoil electrons or nuclei. high-intensity experimental facility developed by SHiP based on number key features developments provide possibility probing large part...
Abstract The Search for Hidden Particles (SHiP) Collaboration has proposed a general-purpose experimental facility operating in beam-dump mode at the CERN SPS accelerator to search light, feebly interacting particles. In baseline configuration, SHiP experiment incorporates two complementary detectors. upstream detector is designed recoil signatures of light dark matter (LDM) scattering and neutrino physics, particular with tau neutrinos. It consists spectrometer magnet housing layered system...