Measurements are presented of the inclusive charged-particle cross sections s dσdx for e+e- annihilation at center-of-mass energies of 5.2, 6.5, and 29.0 GeV. Significant scale breaking is observed in these cross sections. © 1982 The American Physical Society.

A search for charged, pointlike, spin-0 particles with large couplings to the τ lepton has been done at the PEP e+e- storage ring (Stanford Linear Accelerator Center). No evidence for such particles is seen, and limits are placed on the branching fraction to τντ as a function of mass. © 1982 The American Physical Society.

We use data taken by the Mark II detector at the SLAC storage ring PEP to study inclusive lepton production in e+e- annihilation at 29 GeV. From fits to the inclusive lepton momentum and transverse-momentum spectra we measure the semileptonic branching ratios for charm and bottom hadrons. We also determine with good precision the mean value of the bottom fragmentation function using both electron and muon samples. © 1988 The American Physical Society.

We have made a detailed comparison of the charged-particle flow in three-jet events (e+e-qq»g) and radiative two-jet events (e+e-qq») from e+e- annihilation at Ec.m.=29 GeV. Accurate comparisons can be made because these two event types have similar topologies. In the angular region between the quark and antiquark jets, we observe substantially fewer charged tracks in the two-jet events than in the radiative three-jet events. © 1986 The American Physical Society.

Inclusive - production in e+e- annihilation at 29 GeV has been measured with the Mark II detector. From an integrated luminosity of 207 pb-1, we determine a production rate of 0.0140.0060.004 -, + per hadronic event. This is roughly 35 times the Lund-model prediction of 0.0004 -, + per hadronic event, but comparable to the Webber-model prediction of 0.006 -, + per hadronic event. The large rate of - production, compared with production rates for other baryons, and with theoretical predictions based on diquark models, indicates that spin suppression does not hold for - production. © 1987 The American Physical Society.

The branching fraction for -5(0) is measured from data accumulated with the Mark II detector at PEP. Four events are observed with an estimated hadronic background of (0.03-0.02+0.04) events and a background from -30 of (0.05-0.04+0.07) events. This results in a measured branching fraction of (0.160.080.04)%. The candidate events are used to establish an upper limit of 125 MeV/c2 on the mass at the 95% confidence level. © 1985 The American Physical Society.

The Production has been investigated by the Mark II collaboration at the SLAC e+e- storage ring PEP. particles are reconstructed by their decay mode. The fragmentation function has been measured and found to be in good agreement with the Lund-model prediction. production has been measured for the first time in high-energy e+e- annihilation. There is evidence at the 3 level for Ds± decay into ± and ±. © 1988 The American Physical Society.

With use of three-prong τ decays observed by the Mark II detector at the Stanford Linear Accelerator Center (PEP), the τ lifetime is measured to be (4.6±1.9)×10-13 sec. © 1982 The American Physical Society.

Energy correlations have been measured with the MARK II detector at the PEP storage ring (Stanford Linear Accelerator Center) at c.m. energy of 29 GeV and are compared to first-order QCD predictions. Fragmentation processes are significant and limit the precision with which the first-order strong-coupling constant can be determined. © 1982 The American Physical Society.

The branching ratios for + and -(n0), n>~1, have been measured to be 0.078 0.005 0.008 and 0.047 ± 0.005 ± 0.008, respectively. The total three-prong tau branching ratio is 0.128 ± 0.005 ± 0.008. Study of the 3± decay indicates that the three pions are predominantly from a JP=1+ state which decays through a 0± intermediate state in a relative s wave. The mass spectrum is suggestive of a resonance. © 1986 The American Physical Society.