Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-12-28
Phys.Rev.D81:114026,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 7 figures, published version in PRD
Scientific paper
10.1103/PhysRevD.81.114026
We present a phenomenological analysis of the $\cos 2 \phi$ asymmetry recently measured by the COMPASS and HERMES collaborations in unpolarized semi-inclusive deep inelastic scattering. In the kinematical regimes explored by these experiments the asymmetry arises from transverse-spin and intrinsic transverse-momentum effects. We consider the leading-twist contribution, related to the so-called Boer-Mulders transverse-polarization distribution $h_1^{\perp}(x, k_T^2)$, and the twist-4 Cahn contribution, involving unpolarized transverse-momentum distribution functions. We show that a reasonably good fit of the data is achieved with a Boer-Mulders function consistent with the main theoretical expectations. Our conclusion is that the COMPASS and HERMES measurements represent the first experimental evidence of the Boer-Mulders effect in SIDIS.
Barone Vincenzo
Melis Stefano
Prokudin Alexei
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