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Frankfurt 2014 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 37: Hadronenstruktur und -spektroskopie

HK 37.2: Talk

Thursday, March 20, 2014, 14:15–14:30, HZ 1+2

COMPASS results on the transverse spin asymmetry in identified dihadron production in SIDIS — •Christopher Braun — Univ. Erlangen

The parton distribution function h1q(x) of a transversely polarized quark q inside a transversely polarized nucleon, is chiral-odd and therefore not accessible in inclusive deep-inelastic scattering. It can only be observed in semi-inclusive deep-inelastic scattering (SIDIS) in combination with another chiral-odd function like the dihadron interference fragmentation function (IFF) H1,q. The 160 GeV/c polarized muon beam of CERNs M2 beamline allows COMPASS to investigate transverse spin effects using polarized solid state targets.
In this contribution an overview of COMPASS results for the azimuthal asymmetry in identified dihadron production is given. Taking advantage of the very precise particle identification of the apparatus using the RICH detector an identification of the hadrons which form the pairs in terms of pions and kaons was performed. Recently, the full set of this asymmetry from the COMPASS data on the deuteron and the proton target is available. The latter has been taken in the years 2007 and 2010, while the deuteron date dates back to the years 2003 and 2004. Data sets from same targets have been combined and analyzed using homogeneous cuts and methods. This allows for a detailed comparison of the obtained results to each other, to the corresponding results of the HERMES experiment and to model predictions. Furthermore an extraction of the so-called "Transversity" distribution h1(x) for u and d quarks was carried out. − Supported by German BMBF

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