Thursday, June 5th - h.
Aula Seminari (A34)
Study of the low energy electron-positron
cross sections and
hadron spectroscopy using hard photon initial state radiation
emission at BaBar
An analysis of processes with initial state radiation (ISR) has
been performed using data collected by the BaBar experiment at the PEP-II
asymmetric electron-positron collider, corresponding to an integrated luminosity
of about 90 fb^-1.
Muon pairs and multi-hadron final states accompanied by a detected ISR photon
were selected. The invariant mass of the di-muon or hadronic system determines
the virtual photon energy; the cross-sections can be compared with direct
electron-positron cross sections measured at lower center-of-mass energy.
Preliminary results for KK, ppbar, KKpi0, 3pi, 4picross sections are presented
and discussed in terms of low energy hadron spectroscopy.
This technique gives also access to J/Psi production and to the measurement
of the branching ratios of J/Psi decays to mu+mu-, 3pi, 2K2pi and 4K, with
Preliminary results are also discussed for the ratio R of the electron-positron
cross section to hadrons and to mu+mu-pairs.