The τ lifetime was measured with the Mark II vertex detector at the storage ring PEP. ττ=(3.20±0.41±0.35)×10-13 sec was found, which agrees well with e-μ-τ university. © 1983 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.

We report a measurement of the inclusive charged-particle distribution for gluon jets derived from nearly threefold-symmetric three-jet events taken at center-of-mass energy of 29 GeV in e+e- annihilation. The charged-particle spectrum for these jets is observed to fall off more rapidly than those of quark jets of the same energy. © 1985 The American Physical Society.

We have used an electronic tracking system to measure the lifetime of D0 mesons produced in e+e- annihilation at 29 GeV. Based on a sample of 27 events, the lifetime is found to be (4.2-1.0+1.3 1.0) × 10-13 s. © 1984 The American Physical Society.

The differential cross sections for lepton pair production in e+e- annihilation at 29 GeV have been measured and found to be in good agreement with the standard model of the electroweak interaction. With the assumption of e-μ-τ universality, the weak neutral-current couplings are determined to be ga2=0.23±0.05 and gv2=0.03±0.04. © 1983 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 0.0170.0040.004 -++ per hadronic event. A search for *0(1530)-+ leads to an upper limit of N(*0)/N(-)<0.35 at a 90% confidence level. © 1987 The American Physical Society.

Inclusive production in e+e- annihilation at 29 GeV has been measured with the Mark II detector. The cross section is found to be 1.10.50.4 pb. After subtraction of the expected contribution from B decay, an upper limit of 0.02 is obtained for other sources of production. © 1988 The American Physical Society.

We have set an upper limit on the mass from a study of the four-pion invariant-mass distribution in the decay 3 0. We obtain the limit m <164 MeV/c2 at 95% confidence level. © 1984 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.