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HK: Fachverband Physik der Hadronen und Kerne
HK 42: Hadronenstruktur und -spektroskopie
HK 42.2: Vortrag
Dienstag, 5. März 2013, 17:15–17:30, HSZ-304
Single-Hadron transverse target spin asymmetries at COMPASS — •Christoph Adolph — for the COMPASS collaboration — Physikalisches Institut IV der Universität Erlangen-Nürnberg
The quark content of the nucleon at twist-two level in the collinear case can be fully described 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. The measurement 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. By extracting azimuthal asymmetries in hadron production one can access both the Collins fragmentation function and the Sivers distribution function. The COMPASS collaboration has measured these asymmetries in the scattering of a 160 GeV/c polarized µ+ beam off a transversely polarized 6LiD (deuteron) target in the years 2002–2004 and off a transversely polarized NH3 (proton) target in 2007 and 2010. In this contribution we especially present results from the 2010 data for the Collins and Sivers asymmetries for identified pions and kaons.