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Azimuthal asymmetries in SIDIS di-hadron muoproduction off longitudinally polarized protons at COMPASS
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abstract
In this review a first comprehensive study of azimuthal asymmetries in semi-inclusive deep inelastic muoproduction of hadron pairs off longitudinally polarized protons at COMPASS is presented. The study is based on data taken in 2007 and 2011, obtained by impinging a high-energetic $\mu^+$ beam of $160$ GeV/$\it{c}$, respectively $200$ GeV/$\it{c}$, momentum on a solid ammonia target. The discussion is focused on both leading and subleading longitudinal target-spin-dependent asymmetries arising in the di-hadron SIDIS cross section, addressing the role of spin-orbit couplings and quark-gluon correlations in the framework of collinear or transverse momentum dependent factorization.
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Single spin asymmetry $A _ { U L } ^ { \sin ( 3 \phi _ { h } - \phi_{ R } ) }$ in dihadron production in SIDIS
A one-loop spectator-model calculation of the previously uncalculated T-odd dihadron fragmentation function predicts a near-zero sin(3phi_h-phi_R) asymmetry at COMPASS and HERMES, matching the weak observed signal.
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