Physics – High Energy Physics – High Energy Physics - Experiment
Scientific paper
2006-07-11
Physics
High Energy Physics
High Energy Physics - Experiment
Results presented at the DIS 2006 conference in Tsukuba, Japan
Scientific paper
10.1063/1.2750847
The measurement of the so far unknown chiral-odd quark transverse spin distribution in either semi-inclusive DIS (SIDIS) or inclusive measurements in pp collisions at RHIC has an additional chiral-odd fragmentation function appearing in the cross section. These chiral-odd fragmentation functions (FF) can for example be the so-called Collins FF or the Interference FF. HERMES has given a first hint that these FFs are nonzero, however in order to measure the transversity one needs these FFs to be precisely known. We have used 29.0 fb$^{-1}$ of data collected by the Belle experiment at the KEKB $e^+e^-$ collider to measure azimuthal asymmetries for different charge combinations of pion pairs and thus access the Collins FF.
for the Belle Collaboration
Grosse-Perdekamp Matthias
Hasuko Kazumi
Ogawa Akio
Seidl Ralf
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