Speaker
Dr
Charlotte Van Hulse
(University of the Basque Country UPV-EHU)
Description
Multiplicities and azimuthal asymmetries were extracted from e+e−
annihilation data collected with the Belle detector. These data were taken at the KEKB e+e− collider at a center-of-mass energy of
sqrt(s) = 10.52 GeV. The multiplicities provide the cleanest access to spin-independent fragmentation functions, which describe the hadronization of quarks into final-state hadrons. The low center-of-mass energy and the multiplicity extraction beyond z = 0.7 extend the kinematic region covered by earlier measurements. This in combination with the high-precision of the extraction, will in particular allow an improved determination of the gluon fragmentation function. Spin-independent fragmentation functions provide invaluable input for the analysis of the nucleon structure, studied in semi-inclusive deep-inelastic scattering and proton-proton collisions, since they are needed for the spin-dependent and spin-independent flavor decomposition of quark and gluon distribution functions in the nucleon. The recent status of the Belle measurement of charge-integrated pion and kaon multiplicities as well as of azimuthal
asymmetries will be presented.
Authors
Dr
Akio Ogawa
(Brookhaven National Laboratory, Upton, NY)
Dr
Anselm Vossen
(Indiana University Bloomington)
Dr
Charlotte Van Hulse
(University of the Basque Country UPV-EHU)
Dr
Francesca Giordano
(University of Illinois at Urbana-Champaign)
Prof.
Gunar Schnell
(University of the Basque Country UPV-EHU)
Dr
Martin Leitgab
(University of Illinois at Urbana-Champaign)
Prof.
Matthias Grosse-Perdekamp
(University of Illinois at Urbana-Champaign)
Mr
Noriaki Kobayashi
(Tokyo Institute of Technology)
Dr
Ralf Seidl
(RIKEN)
