Study of charged hadronic five-body decays of the D+ and Ds+ mesons

Charged hadronic five-body decays of D+ and Ds+ mesons have been studied in the E687 photoproduction experiment at Fermilab. We report the first compelling evidence of the decay mode D+, Ds+ \u2192 pi 12pi 12pi+pi+pi+ and the measurements of the decays D+ \u2192 K 12pi 12pi+pi+pi+, Ds+ \u2192 K 12K+pi 12pi+pi+ and Ds+ \u2192 phi pi 12pi+pi+. An analysis of the D+ \u2192 K 12pi 12pi+pi+pi+ resonance structure is also presente

Search for the decay of D+ and Ds+ mesons to three charged kaons

We report the results of a search for the doubly Cabibbo suppressed decays D+ \u2192 K+K 12K+ and D+ \u2192 phi K+, and the singly Cabibbo suppressed decays Ds+ \u2192 K+K 12K+ and Ds+ \u2192 phi K+. Our measurements are all consistent with zero branching ratio, and we set 90% confidence level upper limits on the relative D+ branching ratios: BR(phi K+)/BR(phi pi+) < 0.021, BR(K+K-K+)/BR(phi pi+) < 0.025, and BR(K+K-K+)/BR(K-pi+pi+) < 0.0016, and the relative Ds+ branching ratios: BR(phi K+) / BR(phi pi+) < 0.013 and BR(K+K-K+)/BR(phi pi+) < 0.016. The data were accumulated by the Fermilab high energy photoproduction experiment E687

Observation of a narrow state decaying into Csi(c)0pi+

We report the observation of the Csi*(c)+ state decaying into Csi(c)0 pi+ with Csi0(c)->Lamda (anti)K0 pi+ pi- or LamdaK 12pi+pi+pi 12. We have observed 47\ub111 candidate events for the Csi*(c)+ state and measured its mass to be 177.1\ub10.5\ub11.1 MeV/c2 above the Csi(c)0 mass. We have also measured the Csi(c)0 mass to be 2470.0\ub12.8\ub12.6 MeV/c2

Branching ratios of the decays D0-&gt;anti(K)0 K0 and D0 &#8594; K(S)0 K(S)0 K(S)0

The branching ratios of D0->anti(K0) (K0) and D0 \u2192 K(s)0 K(s)0 K(s)0 relative to D0->anti(K0) pi+ pi- are reported. The data were accumulated in the 1990\u20131991 fixed target running period of the Fermilab high energy photoproduction experiment E687. G(D0->anti(K0) K0)/G(D0anti(K0) pi+pi-) is measured to be 0.039+-0.013+-0.013 and G(D0-> K(s)0 K(s)0 K(s)0)/G(D0->anti(K0) pi+pi-) is measured to be 0.035+-0.012+-0.006. We also measure G(D0->anti(K0)pi+pi-)/G(D0->K-pi+) to be 1.61+-0.10+-0.15

Charm meson decay into the final states K(s)0 K+ and and K(s)0 K*+

We have made a new measurement of the branching ratio G(D+->anti(K)0K+)/G(D+->anti(K)0pi+) and the first measurement of G(D+->anti(K)0K+)/G(D+->anti(K)0pi+). The data were accumulated in the 1990\u20131991 fixed target running period of Fermilab high energy photoproduction experiment E687. We measure G(D+->anti(K)0K+)/G(D+->anti(K)0pi+)=0.25+-0.04+-0.02 and G(D+->anti(K)0K+)/G(D+->anti(K)0pi+)=1.1+-0.3+-0.

Analysis of the decay mode D0 &#8594; K&#8722;mu+nu(mu)

Studies of the decay D0 + K-mu+ nu, are reported by Fermilab photoproduction experiment E687. The ratio BR( D0 -> K-mu+ nu(mu),)/BR( D0 -> K-pi+) is determined to be 0,852 +- 0.034 (statistical) +- 0.028 (systematic). Using this result and an isospin argument we infer the ratio BR(D0 -> K*-,mu+ nu(mu))/BR(D0->K- mu+ nu(mu)) = 0.62+- 0.07+- 0.09. The pole mass from the single pole form factor is measured to be M(pole) = l.87(-0.08-0.06)(+0.11+0.07) GeV/c2. Using M(pole) and BR( D0-> K-,mu+ nu(mu))/BR(D0->K-pi+), we calculate |f+(O)| = 0.71 +-0.03+-0.03. We also measure the ratio f-(0)/f+(O) = - 1.3(-3.4)(+3.6) +- 0.

Study of charged hadronic four-body decays of the D0 meson

Charged hadronic four-body decays of D0 mesons have been studied in the E687 photoproduction experiment at Fermilab. Branching ratios relative to the D0 \u2192 K 12pi+pi+pi 12 decay mode for the Cabibbo-suppressed decays D0 \u2192 pi 12pi+pi 12pi+, D0 \u2192 K 12K+pi 12pi+ have been measured and the first evidence of the D0 \u2192 K 12K+K 12pi+ decay mode is reported. An analysis of the D0 \u2192 K 12K+pi 12pi+ resonance structure is also presented

First measurement of the lifetime of the Omega(c)0

We present the first measurement of the lifetime of the Omega(c)0 baryon. The data were collected in the Fermilab high energy photoproduction experiment E687. The measured lifetime is t = 86( 1220+27)(stat.) \ub1 28(syst.) fr. Thus the Omega(c)0 has one of the shorter lifetimes among the weakly decaying singly charmed baryon