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.

We present results on c+ production in 29-GeV e+e- annihilation. The c+ are observed via their semileptonic decays to e+X and +X. With radiative corrections, we find (e+e-c+X)Bc+eX)= 1.5±0.6±0.5 pb or 0.0038±0.0015±0.0012 c+e+X decay per hadronic event, and (e+e-c+X)B(c+X)= 1.4±1.4±0.4 pb or 0.0035±0.0035±0. 0011 c++X decay per hadronic event. These results can be used to place constraints on the predictions of various production models. © 1989 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.

The total momentum and transverse momentum spectra of electrons in e+e- annihilation at 29 GeV have been measured. The inclusive cross section is determined to be 14.4±1.6±5.2 pb for momenta greater than 2 GeV/c. The average semielectronic branching ratios of charm and bottom quarks are measured to be (6.3±1.2±2.1)% and (11.6±2.1±1.7)%, respectively. The fragmentation function for bottom quarks is determined to be peaked at high z, with zb=0.75±0.05±0.04. © 1983 The American Physical Society.