A5081841792- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
A. Alikhanyan National Laboratory
2023
University of Aveiro
2021
European Organization for Nuclear Research
2020
University of Trieste
2012-2015
Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2014
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...
We present a determination of the gluon polarisation Δg/g in nucleon, based on longitudinal double-spin asymmetry DIS events with Q2>1(GeV/c)2 including pair large transverse-momentum hadrons final state. The data were obtained by COMPASS experiment at CERN using 160 GeV/c polarised muon beam scattering off LiD6 target. is evaluated Neural Network approach for three intervals momentum fraction xg covering range 0.04<xg<0.27. values leading order QCD do not show any significant dependence xg....
The production of vector mesons in deep inelastic scattering is an interesting yet scarsely explored channel to study the transverse spin structure nucleon and related phenomena. COMPASS collaboration has performed first measurement Collins Sivers asymmetries for inclusively produced $\rho^0$ mesons. analysis based on data set collected $2010$ using a $160\,\,\rm{GeV}/c$ $\mu^+$ beam impinging transversely polarized $\rm{NH}_3$ target. $\rho^{0}$ are selected from oppositely charged hadron...
The COMPASS Collaboration at CERN has investigated the ${\ensuremath{\pi}}^{\ensuremath{-}}\ensuremath{\gamma}\ensuremath{\rightarrow}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}$ reaction center-of-momentum energy below five pion masses, $\sqrt{s}<5{m}_{\ensuremath{\pi}}$, embedded in Primakoff of 190 GeV pions impinging on a lead target. Exchange quasireal photons is selected by isolating sharp Coulomb peak observed smallest momentum...
A set of measurements azimuthal asymmetries in the production pairs identified hadrons deep-inelastic scattering muons on transversely polarised 6LiD (deuteron) and NH3 (proton) targets is presented. All available data collected years 2003–2004 2007/2010 with COMPASS spectrometer using a muon beam 160GeV/c at CERN SPS were analysed. The provide access to transversity distribution functions via fragmentation function that principle may be independently obtained from e+e− annihilation data....
Large samples of \Lambda, \Sigma(1385) and \Xi(1321) hyperons produced in deep-inelastic muon scattering off a ^6LiD target were collected with the COMPASS experimental setup at CERN. The relative yields \Sigma(1385)^+, \Sigma(1385)^-, \bar{\Sigma}(1385)^-, \bar{\Sigma}(1385)^+, \Xi(1321)^-, \bar{\Xi}(1321)^+ decaying into \Lambda(\bar{\Lambda})\pi measured. heavy hyperon to \Lambda antihyperon \bar{\Lambda} yield ratios found be range 3.8% 5.6% uncertainty about 10%. They used tune...
Exclusive production of the isoscalar vector mesons $\omega$ and $\phi$ is measured with a 190 GeV$/c$ proton beam impinging on liquid hydrogen target. Cross section ratios are determined in three intervals Feynman variable $x_{F}$ fast proton. A significant violation OZI rule found, confirming earlier findings. Its kinematic dependence invariant mass $M_{p\mathrm{V}}$ system formed by $p_\mathrm{fast}$ meson $V$ discussed terms diffractive $p_\mathrm{fast}V$ resonances competition central...
Based on the observation of sizeable target-transverse-spin asymmetries in single-hadron and hadron-pair production Semi-Inclusive measurements Deep Inelastic Scattering (SIDIS), chiral-odd transversity quark distribution functions $h_1^q$ are nowadays well established. Several possible channels to access these were originally proposed. One candidate is measurement polarisation $\Lambda$ hyperons produced SIDIS off transversely polarised nucleons, where transverse struck might be transferred...