A High Statistics Measurement of the Lambdac+ Lifetime

A high statistics measurement of the Lambdac+ lifetime from the Fermilab fixed-target FOCUS photoproduction experiment is presented. We describe the analysis technique with particular attention to the determination of the systematic uncertainty. The measured value of 204.6 +/- 3.4 (stat.) +/- 2.5 (syst.) fs from 8034 +/- 122 Lambdac -> pKpi decays represents a significant improvement over the present world average.Comment: Submitted to Physical Review Letter

A Measurement of the Ds+ Lifetime

A high statistics measurement of the Ds+ lifetime from the Fermilab fixed-target FOCUS photoproduction experiment is presented. We describe the analysis of the two decay modes, Ds+ -> phi(1020)pi+ and Ds+ -> \bar{K}*(892)0K+, used for the measurement. The measured lifetime is 507.4 +/- 5.5 (stat.) +/- 5.1 (syst.) fs using 8961 +/- 105 Ds+ -> phi(1020)pi+ and 4680 +/- 90 Ds+ -> \bar{K}*(892)0K+ decays. This is a significant improvement over the present world average.Comment: 5 pages, 3 figures, 2 tables, submitted to PR

A measurement of branching ratios of D+D^+ and Ds+D^+_s hadronic decays to four-body final states containing a KSK_S

We have studied hadronic four-body decays of $D^+$ and $D^+_s$ mesons with a $K_S$ in the final state using data recorded during the 1996-1997 fixed-target run at Fermilab high energy photoproduction experiment FOCUS. We report a new branching ratio measurement of $\Gamma(D^+\to K_S K^-\pi^+\pi^+)/\Gamma(D^+\to K_S \pi^+\pi^+\pi^-)=0.0768\pm0.0041\pm0.0032$. We make the first observation of three new decay modes with branching ratios $\Gamma(D^+\to K_S K^+\pi^+\pi^-)/\Gamma(D^+\to K_S \pi^+\pi^+\pi^-)=0.0562\pm0.0039\pm0.0040$, \Gamma(D^+\to\K_S K^+ K^-\pi^+)/\Gamma(D^+\to K_S \pi^+\pi^+\pi^-)=0.0077\pm0.0015\pm0.0009, and $\Gamma(D^+_s\to K_S K^+\pi^+\pi^-)/\Gamma(D^+_s\to K_S K^-\pi^+\pi^+)=0.586\pm0.052\pm0.043$, where in each case the first error is statistical and the second error is systematic.Comment: 4 pages, 1 table, 2 figures, submitted to Physical Review Letter

Measurement of the Ds+ lifetime

A high statistics measurement of the Ds+ lifetime from the Fermilab fixed-target FOCUS photoproduction experiment is presented. We describe the analysis of the two decay modes, Ds+→(1020)π+ and Ds+→K̄ *(892)0K+, used for the measurement. The measured lifetime is 507.4±5.5(stat)±5.1(syst)fs using 8961±105 Ds+→(1020)π+ and 4680±90 Ds+→K̄*(892)0K+ decays. This is a significant improvement over the present world average. © 2005 The American Physical Society

A High Statistics Measurement of the [Formula presented] Lifetime

A high statistics measurement of the [Formula presented] lifetime from the Fermilab fixed-target FOCUS photoproduction experiment is presented. We describe the analysis technique with particular attention to the determination of the systematic uncertainty. The measured value of [Formula presented] from [Formula presented] decays represents a significant improvement over the present world average. © 2002 The American Physical Society

A high statistics measurement of the Λ\u3csub\u3ec\u3c/sub\u3e\u3csup\u3e+\u3c/sup\u3e Lifetime

A measurement of charm lifetime from the Fermilab fixed-target photoproduction experiment was presented. The analysis technique was described with special attention to the determination of the systematic uncertainty. A systematic uncertainty of ±0.23% due to absorption was determined. The measured value represented an improvement over the present world average

Study of the decay D0 → K+π-

A signal in the decay channel D0 → K+ φ- was observed and its branching ratio relative to D0 → K- φ+ to be (0.404 ± 0.085 ± 0.025)% was measured. Results show that if charm sector mixing is signficant, the doubly Cabibbo suppressed component of the branching ratio can be determined from the measured ratio by using the relation expressed. While if the charm mixing is sufficiently small, the doubly Cabibbo suppressed branching ratio is simply equal to the measured ratio

New results on c-baryons and a search for cc-baryons in FOCUS

none99noneRatti S.P.; Link J.; Reyes M.; Yager P.M.; Anjos J.; Bediaga I.; Gobel C.; Magnin J.; Massafferi A.; de Miranda J.M.; Pepe I.M.; dos Reis A.C.; Carrillo S.; Casimiro E.; Sanchez-Hernandez A.; Uribe C.; Vasquez F.; Cinquini L.; Cumalat J.P.; O'Reilly B.; Ramirez J.E.; Vaandering E.W.; Butler J.N.; Gaines I.; Garbincius P.H.; Garren L.A.; Gottschalk E.; Kasper P.H.; Kreymer A.E.; Kuschke R.; Bianco S.; Fabbri F.L.; Sarwar S.; Zallo A.; Cawlfield C.; Kim D.Y.; Rahimi A.; Wiss J.; Gardner R.; Kryemadhi A.; Chung Y.S.; Kang J.S.; Ko B.R.; Kwak J.W.; Lee K.B.; Park H.; Alimonti G.; Boschini M.; Caccianiga B.; D'Angelo P.; DiCorato M.; Dini P.; Giammarchi M.; Inzani P.; Leveraro F.; Melvezzi S.; Menasce D.; Mezzadri M.; Milazzo L.; Moroni L.; Pedrini D.; Pontoglio C.; Prelz F.; Rovere M.; Sala S.; Davenport III T.F.; Agostino L.; Arena V.; Boca G.; Bonomi G.; Gianini G.; Liguori G.; Merlo M.M.; Pantea D.; Riccardi C.; Segoni I.; Vitulo P.; Hernandez H.; Lopez A.M.; Mendez H.; Mendez L.; Montiel E.; Olaya D.; Paris A.; Quinones J.; Rivera C.; Xiong W.; Zhang Y.; Wilson J.R.; Cho K.; Handler T.; Mitchell R.; Engh D.; Hosack M.; Johns W.E.; Nehring M.; Sheldon P.D.; Stenson K.; Webster M.Ratti, S. P.; Link, J.; Reyes, M.; Yager, P. M.; Anjos, J.; Bediaga, I.; Gobel, C.; Magnin, J.; Massafferi, A.; de Miranda, J. M.; Pepe, I. M.; dos Reis, A. C.; Carrillo, S.; Casimiro, E.; Sanchez-Hernandez, A.; Uribe, C.; Vasquez, F.; Cinquini, L.; Cumalat, J. P.; O'Reilly, B.; Ramirez, J. E.; Vaandering, E. W.; Butler, J. N.; Gaines, I.; Garbincius, P. H.; Garren, L. A.; Gottschalk, E.; Kasper, P. H.; Kreymer, A. E.; Kuschke, R.; Bianco, S.; Fabbri, F. L.; Sarwar, S.; Zallo, A.; Cawlfield, C.; Kim, D. Y.; Rahimi, A.; Wiss, J.; Gardner, R.; Kryemadhi, A.; Chung, Y. S.; Kang, J. S.; Ko, B. R.; Kwak, J. W.; Lee, K. B.; Park, H.; Alimonti, G.; Boschini, M.; Caccianiga, B.; D'Angelo, P.; Dicorato, M.; Dini, P.; Giammarchi, M.; Inzani, P.; Leveraro, F.; Melvezzi, S.; Menasce, D.; Mezzadri, M.; Milazzo, L.; Moroni, L.; Pedrini, D.; Pontoglio, C.; Prelz, F.; Rovere, M.; Sala, S.; Davenport III, T. F.; Agostino, L.; Arena, V.; Boca, G.; Bonomi, G.; Gianini, G.; Liguori, G.; Merlo, M. M.; Pantea, D.; Riccardi, C.; Segoni, I.; Vitulo, P.; Hernandez, H.; Lopez, A. M.; Mendez, H.; Mendez, L.; Montiel, E.; Olaya, D.; Paris, A.; Quinones, J.; Rivera, C.; Xiong, W.; Zhang, Y.; Wilson, J. R.; Cho, K.; Handler, T.; Mitchell, R.; Engh, D.; Hosack, M.; Johns, W. E.; Nehring, M.; Sheldon, P. D.; Stenson, K.; Webster, M

A High Statistics Measurement of the [Formula presented] Lifetime

A high statistics measurement of the [Formula presented] lifetime from the Fermilab fixed-target FOCUS photoproduction experiment is presented. We describe the analysis technique with particular attention to the determination of the systematic uncertainty. The measured value of [Formula presented] from [Formula presented] decays represents a significant improvement over the present world average. © 2002 The American Physical Society

Measurement of the Ds+ lifetime

A high statistics measurement of the Ds+ lifetime from the Fermilab fixed-target FOCUS photoproduction experiment is presented. We describe the analysis of the two decay modes, Ds+→(1020)π+ and Ds+→K̄ *(892)0K+, used for the measurement. The measured lifetime is 507.4±5.5(stat)±5.1(syst)fs using 8961±105 Ds+→(1020)π+ and 4680±90 Ds+→K̄*(892)0K+ decays. This is a significant improvement over the present world average. © 2005 The American Physical Society