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The authors present measurements of the [gamma][gamma]* → [pi]° transition form factor for the momentum transfer range Q2 = 4-40 GeV2 and the [gamma][gamma]* → [eta]{sub c} transition form factor for the range Q2 = 2-50 GeV2. The results of the measurement of the [eta]{sub c} mass, total and two-photon widths are also presented.
We present a measurement of the total width[Lambda][sub tot][sup[eta][sub c]] and mass M[sub[eta][sub c]] of the[eta][sub c] meson with the BABAR detector at the PEP-II B-factory at SLAC. The results based on a data sample of 88 fb[sub -1] are[Lambda][sub tot][sup[eta][sub c]]= (33.3[+-] 2.5(stat.)[+-] 0.8(sys.))MeV/c[sup 2] and M[sub[eta][sub c]]= (2983.3[+-] 1.2[+-] 1.8) MeV/c[sup 2]. An enhancement observed around 3.63 GeV/c[sup 2] can be interpreted as an evidence for the[eta][sub c](2S) state. In addition a preliminary measurement of the[tau] lepton lifetime using 30.2 fb[sup -1] is described. The measured[tau] lifetime is:[tau][sub[tau]]= (290.8[+-] 1.5(stat.)[+-] 1.6(syst.)) fs.
This volume brings together the latest developments within a wide spectrum of topics in particle physics. Covering both theoretical and experimental aspects, areas such as neutrino and astroparticle physics, tests of the Standard Model and beyond, heavy quark physics, non-perturbative QCD, quantum gravity effects and cosmology, physics at the future accelerators, etc. are discussed.
Recent experimental results in two-photon physics are reviewed. Possibilities for future experimentation at high [gamma][gamma] collision energies are discussed. 95 refs., 12 figs., 7 tabs.