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Measurement of azimuthal modulations in SIDIS off proton target at COMPASS
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abstract
The azimuthal angle ($\phi_h$) distribution of hadrons produced in deep inelastic scattering serves as a powerful tool for probing the nucleon structure in terms of transverse momentum dependent parton distribution functions and fragmentation functions. For an unpolarized nucleon, three azimuthal modulations arise: $\cos\phi_h$ related to the Cahn effect, $\cos2\phi_h$ linked to the Boer--Mulders function, and $\sin\phi_h$ known as beam-spin asymmetry, each revealing insights into combinations of twist-two or higher-twist distribution and fragmentation functions. The COMPASS collaboration at CERN collected semi-inclusive deep inelastic scattering events in 2016 and 2017 using a longitudinally polarized 160 GeV/$c$ muon beam scattering off a liquid hydrogen target. Data from 2016 corresponding to about 1/3 of the full sample have been analyzed to measure the azimuthal modulations of charged hadrons. For the first time, the results were corrected for QED radiative effects using the DJANGOH MC generator.
Forward citations
Cited by 1 Pith paper
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Flavor, transverse momentum, and azimuthal dependence of charged pion multiplicities in SIDIS with 10.6 GeV electrons
New JLab Hall C data show charged-pion SIDIS transverse-momentum shapes are nearly flavor-independent and π− azimuthal cos(φ*) moments are positive at high z.
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