193 research outputs found
In Vivo Bioluminescent Monitoring of Parasites in BALB/c Mouse Models of Cutaneous Leishmaniasis Drug Discovery
No full textObservation of a narrow state decaying into Xi(c) (0)pi(+)
No full textWe report the observation of the Csi*(c)+ state decaying into Csi(c)0 pi+ with Csi0(c)->Lamda (anti)K0 pi+ pi- or LamdaK−pi+pi+pi−. We have observed 47±11 candidate events for the Csi*(c)+ state and measured its mass to be 177.1±0.5±1.1 MeV/c2 above the Csi(c)0 mass. We have also measured the Csi(c)0 mass to be 2470.0±2.8±2.6 MeV/c2
A new measurement of the lifetime of the Csi(c)+
No full textNew measurements of the lifetime and mass of the Csi(c)+ are presented. The Csi(c)+ has been reconstructed through the two decay channels Csi−pi+pi+ and Sigma+K−pi+. The data were accumulated by the Fermilab high energy photoproduction experiment E687. The lifetime is measured to be 0.34(+0.07)(-0.05) +/-0.02 ps while the mass is measured to be 2465.8±1.9(stat.)±2.5(syst.) MeV/c
Study of Lambda(+)(c) Cabibbo favored decays containing a Lambda baryon in the final state
No full textUsing data from the FOCUS experiment (FNAL-E831), we study the decay of Lambda(c)(+) baryons into final states containing a Lambda hyperon. The branching fractions of Lambda(c)(+) into Lambda pi(+), Lambda pi(+)pi(+)pi(-) and Lambda(K) over bar K-0(+) relative to that into pK(-)pi(+) are measured to be 0.217 +/- 0.013 +/- 0.020, 0.508 +/- 0.024 +/- 0.024 and 0.142 +/- 0.018 +/- 0.022, respectively. We also report new measurements of Gamma(Lambda(c)(+)->Sigma(0)pi(+))/Gamma(Lambda(c)(+)->Lambda pi(+)) = 1.09 +/- 0.11 +/- 0.19, Gamma(Lambda(c)(+)->Sigma pi(+)pi(+)pi(-))/Gamma(Lambda(c)(+)->Lambda pi(+)pi(+)pi(-)) = 0.26 +/- 0.06 +/- 0.09 and Gamma(Lambda(c)(+) ->Xi(1690)(0)(Lambda(K) over bar (0))K+)/Gamma(Lambda c+->Lambda(K) over bar K-0(+)) = 0.32 +/- 0.10 +/- 0.04. Further, an analysis of the subresonant structure for the Lambda(c)(+) -> Lambda pi(+)pi(+)pi(-) decay mode is presented
Search for Lambda(+)(c)-> pK(+)pi(-) and D-s(+)-> K+K+pi(-) using genetic programming event selection
No full textWe apply a genetic programming technique to search for the doubly Cabibbo suppressed decays Λ+c → pK+π− and Ds+ → K+K+π−. We normalize these decays to their Cabibbo favored partners and find BR(Λ+c → pK+π−)/BR(Λ+c → pK−π+) = (0.05 ± 0.26 ± 0.02)% and BR(Ds+ → K+K+π−)/BR(Ds+ → K−K+π+) = (0.52 ± 0.17 ± 0.11)% where the first errors are statistical and the second are systematic. Expressed as 90% confidence levels (CL), we find < 0.46 and < 0.78%, respectively. This is the first successful use of genetic programming in a high energy physics data analysis
Use of In Vivo Imaging System Technology in Leishmania major BALB/c Mouse Ear Infection Studies
No full textMeasurements of Xi(+)(c) branching ratios
No full textAbstractUsing data collected by the fixed target Fermilab experiment FOCUS, we measure the branching ratios of the Cabibbo-favored decays Ξc+→Σ+K−π+, Ξc+→Σ+K̄∗(892)0, and Ξc+→Λ0K−π+π+ relative to Ξc+→Ξ−π+π+ to be 0.91±0.11±0.04, 0.78±0.16±0.06, and 0.28±0.06±0.06, respectively. We report the first observation of the Cabibbo-suppressed decay Ξc+→Σ+K+K− and we measure the branching ratio relative to Ξc+→Σ+K−π+ to be 0.16±0.06±0.01. We also set 90% confidence level upper limits for Ξc+→Σ+φ and Ξc+→Ξ∗(1690)0(Σ+K−)K+ relative to Ξc+→Σ+K−π+ to be 0.12 and 0.05, respectively. We find an indication of the decays Ξc+→Ω−K+π+ and Ξc+→Σ∗(1385)+K̄0 and set 90% confidence level upper limits for the branching ratios with respect to Ξc+→Ξ−π+π+ to be 0.12 and 1.72, respectively. Finally, we determine the 90% C.L. upper limit for the resonant contribution Ξc+→Ξ∗(1530)0π+ relative to Ξc+→Ξ−π+π+ to be 0.10
New measurement of the masses and widths of the Sigma(*++)(c) and Sigma(*0)(c) charmed baryons
No full textUsing data recorded by the CLEO III detector at the Cornell electron storage ring (CESR), we have made measurements of some properties of the Sigma(c)(*)(++) and Sigma(c)(*)(0) charmed baryons. In particular: Gamma(Sigma(c)(*)(++)) = 14.4-1.5+1.6 +/- 1.4 MeV, M(Sigma(c)(*)(++)) - M(Lambda(c)(+)) = 231.5 +/- 0.4 +/- 0.3 MeV, Gamma(Sigma(c)(*0)) = 16.6-1.7+1.9 +/- 1.4 MeV, M(Sigma(c)(*0)) - M(Lambda(c)(+)) = 231.4 +/- 0.5 +/- 0.3 MeV
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