Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Hadronenstruktur und -spektroskopie
HK 23.4: Vortrag
Mittwoch, 21. März 2012, 15:00–15:15, RW 2
Single-Hadron transverse target spin asymmetries at COMPASS — •Christoph Adolph — Physikalisches Institut IV der Universität Erlangen-Nürnberg
The quark content of the nucleon at twist-two level in the collinear case can be fully characterized by three independent distribution functions for each quark flavour: the unpolarized distribution function f1(x), the helicity distribution function g1(x) and the transverse spin distribution function h1(x), also called transversity. COMPASS is a fixed target experiment at CERN where the nucleon spin structure is investigated using a 160 GeV/c polarized µ+ beam and polarized solid state targets. The measurements of single spin asymmetries in semi-inclusive deep inelastic scattering (SIDIS) on a transversely polarized target are an important part of the COMPASS physics program. After taking data in the years 2002-2004 using a transversely polarized 6LiD (deuteron) target, in 2007 and 2010 data were collected on a transversely polarized NH3 (proton) target. The data allows to investigate the transversity distribution function, e.g. coupled to the Collins fragmentation function, as well as transverse momentum dependent distribution functions, like the Sivers distribution function, by measuring azimuthal asymmetries in hadron production. In this contribution we present the results on one hadron spin asymmetries from the 2010 data for the Collins and Sivers asymmetries.
supported by German BMBF