Spin dependent fragmentation function at Belle

Abstract

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.

Results presented at the DIS 2006 conference in Tsukuba, Japan

References in corpus (1)

• Collins effect in semi-inclusive deeply inelastic scattering and in electron positron annihilation

Cited by in corpus (5)

• A new measurement of the Collins and Sivers asymmetries on a transversely polarised deuteron target
• Sivers and Collins Single Spin Asymmetries
• COMPASS Results on Transverse Single-Spin Asymmetries
• Recent developments in nucleon spin structure with focus on h_{1L}^{\perp} and pretzelosity h_{1T}^\perp
• Collins Effect in SIDIS and in ${\mathbf{e}}^{+}{\mathbf{e}}^{-}$ Annihilation