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HK: Fachverband Physik der Hadronen und Kerne
HK 3: Elektromagnetische und Hadronische Sonden
HK 3.4: Vortrag
Montag, 12. März 2007, 18:45–19:00, A
Transversity signals in two hadron correlation at COMPASS — •Frank Massmann — Helmholtz-Institut, Universität Bonn
COMPASS is a fixed target experiment on the SPS M2 beamline at CERN. Its target (6LID) can be both longitudinally and transversely polarized with respect to the polarized 160 GeV/c µ+ beam. The transverse configuration allows the measurement of transversity effects. To fully specify the quark structure of the nucleon at the twist two level, three quark distribution functions must be taken into account: the spin averaged distribution function q(x), the helicity distribution Δq(x) and the transverse spin distribution ΔTq(x). This last function, referred to as transversity, is chiral-odd and can only be measured in combination with another chiral-odd function. At COMPASS, ΔTq(x) can be measured in semi-inclusive deep-inelastic scattering (SIDIS), requiring the detection of hadronic products. The measurement of two hadron production, introducing the chiral odd interference fragmentation function H1 is considered as a new probe of the transverse spin distribution function ΔTq(x). Results will be presented including particle identification by using the information of the RICH-detector. This work is supported by BMBF.