A High statistics study of states containing heavy quarks using the wide band photon beam and the E-687 multiparticle spectrometer.

The spectrometer used in Fermilab experiment 687 to study the photoproduction and decay of charm particles will be upgraded to enable it to accumulate 10**6 fully reconstructed charm particles. The physics will involve high precision studies of the D semileptonic decays, QCD studies of double D events, a measurement of the absolute branching fraction for the D0, searches for the D0 mixing, CP violation, rare and forbidden decays, fully leptonic decays of the D+ and a systematic investigation of charm baryons and their lifetimes

Search for CP violation in charm meson decay

We report the results of a search for CP-violating decay rate asymmetries (ACP) in the charm decay modes D+\u2192K-K+pi+, D+\u2192K\uaf*0K+, D+\u2192phi pi+, and D0\u2192K+K-. Our measurements are all consistent with zero asymmetry: ACP(KKpi)=-0.031\ub10.068, ACP(K*K)=-0.12\ub10.13, ACP(phi pi)=0.066\ub10.086, and ACP(KK)=0.024\ub10.084. The data were accumulated by the Fermilab high energy photoproduction experiment E68

MEASUREMENT OF THE LAMBDA-C+ LIFETIME

A precise measurement of the \u39bc+ lifetime using approximately 1340 fully reconstructed \u39bc+\u2192pK-\u3c0+ and charge conjugate decays is presented. The data were accumulated by the Fermilab high energy photoproduction experiment E687. The lifetime of the \u39bc+ is measured to be 0.215\ub10.016\ub10.008 p

PRECISE MEASUREMENT OF THE D(S)+/- MESON LIFETIME.

A precise measurement of the Ds\ub1 meson lifetime is reported. The data were accumulated by the high energy photoproduction experiment E687 at Fermilab in the 1990\u20131991 fixed target run. The measurement has been done using 900 fully reconstructed Ds\ub1\u2192phi pi\ub1 decays. The lifetime of the Ds\ub1 meson is measured to be 0.475\ub10.020\ub10.007 p

MEASUREMENT OF THE LIFETIME OF THE XI(C)(0)

A measurement of the lifetime of the charmed strange baryon XIc0 is presented. The data were accumulated by the Fermilab high energy photoproduction experiment E687. The measurement has been made using 42\ub110 XIc0\u2192XI-pi+ decays. The lifetime of the XIc0 is measured to be 0.101-0.017+0.025\ub10.005 ps and its mass is measured to be 2462.1\ub13.1\ub11.4 MeV/c

MEASUREMENT OF THE MASS AND LIFETIME OF THE XIc+

Measurements of the mass and lifetime of the \u39ec+ decaying into \u39e-pi+pi+ are presented. The data were accumulated by the Fermilab high-energy photoproduction experiment E687. The mass of the \u39ec+ is measured to be 2464.4\ub12.0\ub11.4 MeV/c2 and the lifetime is measured to be 0.41-0.08+0.11\ub10.02 ps

1ST EVIDENCE OF OMEGA-C(0)- > OMEGA- PI+

We report evidence of a narrow resonance at a mass of 2705.9 \ub1 3.3 \ub1 2.0 MeV/c2 in the final state Omega 12\u3c0+ and the charge conjugate. The mass and width support the interpretation of a weakly decaying doubly strange charmed baryon, the Omegac0. Limits on the relative branching ratios for Omegac0\u2192Omega 12K 12\u3c0+\u3c0+ and Omegac0\u2192Omega- pi 12pi+pi+ are also presented

ANALYSIS OF THE DECAY MODE D+ -> anti(K*0) MU+NU

Fermilab high-energy photoproduction experiment E687 provides a high statistics sample of the decay mode D+ \u2192 anti(K 170) mu+nu (charge conjugates are implied). Our analysis yields a branching ratio of Gamma (D+ \u2192 anti(K 170)mu+\u3bd)/Gamma(D+ \u2192 K 12pi+pi+) = 0.56\ub10.04\ub10.06. The ratios of the form factors governing the decay are measured to be R\u3bd = 1.74 \ub10.27\ub10.28 and R2 = 0.78\ub10.18\ub10.10, implying a polarization of Gammal/Gammat = 1.20\ub10.13 \ub10.13 for the electron decay. Finally, we report new limits on the decay modes D+ \u2192 K-pi+mu+nu (nonresonent) and D+ \u2192 anti(K 170) pi0 mu+nu

Semileptonic charmed meson decays.

Results on the semileptonic channels: Do→K+μ−ν+c.c. and D+→K∗oμ+ν+c.c., photoproduced in the E687 experiment at Fermilab, are presented. A preliminary measurement of Γ(Do→K∗−μν)/Γ(D+→K∗oμν) is also discussed