Bochum 2009 – wissenschaftliches Programm
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HK: Fachverband Hadronen und Kerne
HK 70: Hadron Structure and Spectroscopy II
HK 70.3: Vortrag
Donnerstag, 19. März 2009, 17:30–17:45, H-ZO 30
The HERMES measurement of transverse single-spin asymmetries — •Markus Diefenthaler — DESY
In 2005 the HERMES collaboration published first evidence for azimuthal single-spin asymmetries in the semi-inclusive production of charged pions on a transversely polarised hydrogen target. Significant signals for both the Collins and Sivers mechanisms were observed in data recorded during the 2002–2003 running period of the HERMES experiment. In the conference contribution a preliminary analysis of the full data set with transverse target polarisation is presented for π-mesons and charged K-mesons. These results contribute substantially to the global analysis of the transversity distribution and provide clear evidence for the naive time reversal odd Sivers distribution function.
The published results on single-spin asymmetries in semi-inclusive dihadron production provide an independent experimental constraint on the transversity distribution. Thereby first evidence is found for a non-zero naive time reversal odd chiral-odd dihadron fragmentation function H1,q∠.