0000000000744376

AUTHOR

M. Fabro

showing 3 related works from this author

Spin asymmetry A1d and the spin-dependent structure function g1d of the deuteron at low values of x and Q2

2007

Abstract We present a precise measurement of the deuteron longitudinal spin asymmetry A 1 d and of the deuteron spin-dependent structure function g 1 d at Q 2 1 ( GeV / c ) 2 and 4 × 10 −5 x 2.5 × 10 −2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A 1 d and g 1 d are found to be consistent with zero in the whole range of x.

PhysicsNuclear and High Energy PhysicsRange (particle radiation)Large Hadron Collider010308 nuclear & particles physicsmedia_common.quotation_subjectStructure functionZero (complex analysis)01 natural sciencesAsymmetryNuclear physicsDeuterium0103 physical sciencesCOMPASS experiment010306 general physicsSpin-½media_commonPhysics Letters B
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Measurement of the Spin Structure of the Deuteron in the DIS Region

2005

We present a new measurement of the longitudinal spin asymmetry A_1^d and the spin-dependent structure function g_1^d of the deuteron in the range 1 GeV^2 < Q^2 < 100 GeV^2 and 0.004< x <0.7. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarised muon beam and a large polarised 6-LiD target. The results are in agreement with those from previous experiments and improve considerably the statistical accuracy in the region 0.004 < x < 0.03.

Nuclear and High Energy PhysicsParticle physicsmedia_common.quotation_subjectFOS: Physical sciencesSpin structure01 natural sciencesAsymmetryCOMPASSHigh Energy Physics - ExperimentNuclear physicsHigh Energy Physics - Experiment (hep-ex)deep inelastic scatteringstructure function0103 physical sciencesCOMPASS experiment010306 general physicsNuclear Experimentmedia_commonSpin-½PhysicsLarge Hadron ColliderMuon010308 nuclear & particles physicsDeep inelastic scatteringstructure function; COMPASS; DEEP INELASTIC-SCATTERINGstructure functionsDEEP INELASTIC-SCATTERINGHigh Energy Physics::ExperimentParticle Physics - ExperimentBeam (structure)
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Gluon polarization in the nucleon from quasi-real photoproduction of high-pT hadron pairs

2006

Abstract We present a determination of the gluon polarization Δ G / G in the nucleon, based on the helicity asymmetry of quasi-real photoproduction events, Q 2 1 ( GeV / c ) 2 , with a pair of large transverse-momentum hadrons in the final state. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered on a polarized 6 LiD target. The helicity asymmetry for the selected events is 〈 A ∥ / D 〉 = 0.002 ± 0.019 ( stat ) ± 0.003 ( syst ) . From this value, we obtain in a leading-order QCD analysis Δ G / G = 0.024 ± 0.089 ( stat ) ± 0.057 ( syst ) at x g = 0.095 and μ 2 ≃ 3 ( GeV / c ) 2 .

Quantum chromodynamicsPhysicsNuclear and High Energy PhysicsParticle physicsMuon010308 nuclear & particles physicsHadronDeep inelastic scattering01 natural sciencesHelicityGluonNuclear physics0103 physical sciencesCOMPASS experimentHigh Energy Physics::ExperimentNuclear Experiment010306 general physicsNucleonPhysics Letters B
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