Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-09-16
Physics
High Energy Physics
High Energy Physics - Phenomenology
3 pages, 3 eps figures, to appear in the proceedings of INPC2007 (International Nuclear Physics Conference), Tokyo, Japan, Jun
Scientific paper
Fragmentation functions of pion, kaon, and nucleon are determined by global analyses of hadron-production data in $e^+e^-$ annihilation. It is particularly important that uncertainties of the fragmentation functions are estimated for the first time. We found that light-quark and gluon fragmentation functions have large uncertainties, so that one should be careful in using these functions for hadron-production processes in heavy-ion collisions and lepton scattering. The analysis is extended to possible exotic hadron search by fragmentation functions. We found that internal structure of $f_0 (980)$, such as $s\bar s$ or tetraquark configuration, can be determined by noting differences between favored and disfavored fragmentation functions.
Hirai Makoto
Kumano S.
Nagai T.-H.
Oka Makoto
Sudoh Kazutaka
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