A. Bressan

ORCID: 0000-0002-3718-6377
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About
Contact & Profiles
Research Areas
  • Particle physics theoretical and experimental studies
  • Quantum Chromodynamics and Particle Interactions
  • Particle Detector Development and Performance
  • High-Energy Particle Collisions Research
  • Radiation Detection and Scintillator Technologies
  • Dark Matter and Cosmic Phenomena
  • CCD and CMOS Imaging Sensors
  • Atomic and Subatomic Physics Research
  • Particle Accelerators and Free-Electron Lasers
  • Nuclear Physics and Applications
  • Superconducting Materials and Applications
  • Calibration and Measurement Techniques
  • Photocathodes and Microchannel Plates
  • Muon and positron interactions and applications
  • Geophysics and Gravity Measurements
  • Advanced NMR Techniques and Applications
  • Particle accelerators and beam dynamics
  • Computational Physics and Python Applications
  • Cold Atom Physics and Bose-Einstein Condensates
  • Nuclear physics research studies
  • Spectroscopy and Laser Applications
  • Medical Imaging Techniques and Applications
  • Astronomical Observations and Instrumentation
  • Electron and X-Ray Spectroscopy Techniques
  • Crystallization and Solubility Studies

University of Trieste
2015-2024

Istituto Nazionale di Fisica Nucleare, Sezione di Trieste
2015-2024

Istituto di Matematica Applicata e Tecnologie Informatiche
2024

University of Padua
2023

University of Aveiro
2017-2020

Università degli Studi del Piemonte Orientale “Amedeo Avogadro”
2019

Istituto Nazionale di Fisica Nucleare, Sezione di Torino
2009-2019

Bielefeld University
2014

Istituto Nazionale di Fisica Nucleare
2011-2014

European Organization for Nuclear Research
1997-2009

10.1016/j.nuclphysa.2022.122447 article EN Nuclear Physics A 2022-08-08

First measurements of the Collins and Sivers asymmetries charged hadrons produced in deep-inelastic scattering muons on a transversely polarized 6-LiD target are presented. The data were taken 2002 with COMPASS spectrometer using muon beam CERN SPS at 160 GeV/c. asymmetry turns out to be compatible zero, as does measured within present statistical errors.

10.1103/physrevlett.94.202002 article EN Physical Review Letters 2005-05-26

We present the final results of spin asymmetries A1 and structure functions g1 proton deuteron in kinematic range 0.0008<x<0.7 0.2<Q2<100GeV2. For determination A1, addition to usual method which employs inclusive scattering events includes a large radiative background at low x, we use new minimizes by selecting with least one hadron as well muon state. find that this gives smaller errors for x<0.02, so it is combined provide optimal set results.Received 18 May...

10.1103/physrevd.58.112001 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 1998-10-19

We have measured the spin-dependent structure function g1p in inclusive deep-inelastic scattering of polarized muons off protons, kinematic range 0.003<x<0.7 and 1GeV2<Q2<60GeV2. A next-to-leading order QCD analysis is used to evolve g1p(x,Q2) a fixed Q02. The first moment at Q02=10GeV2 Γ1p=0.136±0.013 (stat) ±0.009 (syst) ±0.005 (evol). This result below prediction Ellis-Jaffe sum rule by more than two standard deviations. singlet axial charge a0 found be 0.28±0.16. In Adler-Bardeen...

10.1103/physrevd.56.5330 article EN Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fields 1997-11-01

10.1016/s0168-9002(99)00820-7 article EN Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 1999-12-01

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...

10.1016/j.physletb.2012.09.056 article EN cc-by Physics Letters B 2012-09-26

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...

10.1103/physrevlett.119.112002 article EN cc-by Physical Review Letters 2017-09-12

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...

10.1016/j.physletb.2015.11.064 article EN cc-by Physics Letters B 2015-11-27

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.

10.1016/j.physletb.2015.03.056 article EN cc-by Physics Letters B 2015-04-05

We present a new measurement of the spin-dependent structure function g1d deuteron in deep inelastic scattering 190 GeV polarised muons on deuterons, kinematic range 0.003 < x 0.7 and 1 GeV2 Q2 60 GeV2. This is found to be negative at small x. The first moment Γ1d=∫01g1ddx evaluated Q02 = 10 0.034 ± 0.009 (stat.) 0.006 (syst.). value below Ellis-Jaffe sum rule prediction by three standard deviations. Using our earlier determination Γ1p, we obtain Γ1p − Γ1n 0.199 0.038 which agrees with Bjorken rule.

10.1016/0370-2693(95)00898-u article EN cc-by-nc-nd Physics Letters B 1995-08-01

We present a measurement of semi-inclusive spin asymmetries for positively and negatively charged hadrons from deep inelastic scattering polarised muons on protons deuterons in the range 0.003<x<0.7 Q2>1 GeV2. Compared to our previous publication this subject, with new data statistical errors have been reduced by nearly factor two. From these inclusive we determine quark distributions valence quarks non-strange sea at Q2=10 The u distribution, Δuv(x), is positive polarisation increases x. d...

10.1016/s0370-2693(97)01546-3 article EN cc-by-nc-nd Physics Letters B 1998-02-01

10.1016/s0168-9002(01)00931-7 article EN Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 2002-03-01

We present a determination of the gluon polarization Delta G/G in nucleon, based on helicity asymmetry quasi-real photoproduction events, Q^2&lt;1(GeV/c)^2, with pair large transverse-momentum hadrons final state. The data were obtained by COMPASS experiment at CERN using 160 GeV polarized muon beam scattered 6-LiD target. for selected events is = 0.002 +- 0.019(stat.) 0.003(syst.). From this value, we obtain leading-order QCD analysis G/G=0.024 0.089(stat.) 0.057(syst.) x_g 0.095 and mu^2...

10.1016/j.physletb.2005.11.049 article EN cc-by Physics Letters B 2005-11-29
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