TMD measurements at COMPASS

Braun, C. (2013) TMD measurements at COMPASS. Il nuovo cimento C, 36 (5). pp. 67-72. ISSN 1826-9885

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In this contribution an overview of recent COMPASS results for transverse spin dependent azimuthal asymmetries in one- and two-hadron production is given. This includes the results on the third parton distribution function (PDF) h1 defined in collinear QCD, the so-called “Transversity” which can be measured in combination with either the Collins fragmentation function or the interference fragmentation function (IFF). Taking into account the transverse momentum kT of the quarks, more PDFs can be defined, which are transverse momentum dependent (TMD), like the Sivers function which describes an unpolarized quark in a transversely polarized nucleon. The transverse spin of the nucleon, the quark spin and its kT give rise to 8 asymmetries in the semi-inclusive deep inelastic scattering (SIDIS) cross-section, among them are 4 leading-twist and 4 higher-twist. The latest COMPASS results of these data taken on a transversely polarized proton target (NH3) and with a 160 GeV/c muon beam in the year 2010 are presented and compared to the corresponding results from HERMES and recent model predictions.

Item Type: Article
Uncontrolled Keywords: Photon and charged-lepton interactions with hadrons ; Polarization in interactions and scattering
Subjects: 500 Scienze naturali e Matematica > 530 Fisica
Depositing User: Marina Spanti
Date Deposited: 06 May 2020 16:17
Last Modified: 06 May 2020 16:17

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