Unpolarized azimuthal asymmetries in SIDIS at COMPASS

Journal Article · Wed Jan 15 04:00:00 EST 2014 · Physics of Particles and Nuclei

DOI:https://doi.org/10.1134/S1063779614010882· OSTI ID:22977287

Sbrizzai, G. ^[1]

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1. Physics Department and INFN, Trieste University, Trieste (Italy)

The study of the spin structure of the nucleon and of the effects due to the quarks transverse momentum are part of the scientific program of COMPASS, a fixed target experiment at the CERN SPS. The azimuthal modulations which appear in the cross-section of SIDIS off unpolarised targets give insight on the intrinsic momentum structure of the nucleon and on the possible correlation between transverse spin and transverse momentum of the quarks. We present the results for the amplitudes of the cos(ϕ), cos(2ϕ), and sin(ϕ) modulatuions (where ϕ is the azimuthal hadron angle in the gamma-nucleon system) obtained from the COMPASS data collected with a 160 GeV/c positive muon beam impinging on a deuteron target. The amplitudes are measured for both positive and negative hadrons, and the results on the dependence of the relevant kinematical variables obtained after a multi dimensional analysis are also presented.

• OSTI ID: 22977287
• Journal Information: Physics of Particles and Nuclei, Journal Name: Physics of Particles and Nuclei Journal Issue: 1 Vol. 45; ISSN 1063-7796
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CERN SPS SYNCHROTRON
COMPASS DETECTOR
CROSS SECTIONS
DEUTERIUM TARGET
MANY-DIMENSIONAL CALCULATIONS
MUON BEAMS
NUCLEONS
TRANSVERSE MOMENTUM