Showing papers by "Alberto Santoro published in 1988"

Measurement of the D0, D+, and Ds+ lifetimes.

Abstract: We have measured the lifetimes of the D/sup 0/, D/sup +/, and D/sub s//sup +/ mesons which were produced by a high-energy photon beam incident on beryllium. Using the Fermilab Tagged Photon Spectrometer with a silicon-microstrip vertex detector we have collected 10/sup 8/ events from which we have extracted about 4200 D/sup 0/ decays in the K/sup -/..pi../sup +/ and K/sup -/..pi../sup +/..pi../sup -/..pi../sup +/ modes, 3000 D/sup +/ into the K/sup -/..pi../sup +/..pi../sup +/ channel, and a total of 230 D/sub s//sup +/ into phi..pi../sup +/ and K-bar/sup *//sup 0/K/sup +/. From an analysis of these events we have determined the lifetimes for the D/sup 0/, D/sup +/, and D/sub s//sup +/ to be 0.422 +- 0.008 +- 0.010, 1.090 +- 0.030 +- 0.025, and 0.47 +- 0.04 +- 0.02 psec, respectively

Study of D0-D-bar0 mixing.

Abstract: We present a study of D/sup 0/ mixing using events of the type D/sup *//sup +/..--> pi../sup +/D/sup 0/, with D/sup 0/..-->..K/sup +/..pi../sup -/ and D/sup 0/..-->..K/sup +/..pi../sup -/..pi../sup +/..pi../sup -/. The decay time is used to separate mixing from doubly Cabibbo-suppressed decays. We observe no evidence for mixing in either mode. Combining the results from the two decay modes, we find r/sub M/ = 0.0005 +- 0.0020 or r/sub M/<0.0037 at the 90% confidence level, where r/sub M/ is the ratio of wrong-sign decays from mixing to right-sign decays. We also present limits on doubly Cabibbo-suppressed decays and consider the effect of possible interference.

Measurement of Dx+/- decays and Cabibbo-suppressed D+/- decays.

Abstract: We report on a Dalitz-plot analysis of 250 ${\mathit{D}}^{\ifmmode\pm\else\textpm\fi{}}$ and 290 ${\mathit{D}}_{\mathit{s}}^{\ifmmode\pm\else\textpm\fi{}}$ decays into ${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$. We measure the relative rate for each charmed meson decaying into \ensuremath{\varphi}${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$, K\ifmmode\bar\else\textasciimacron\fi{}${\mathrm{*}}^{0}$(K${\mathrm{*}}^{0}$)${\mathit{K}}^{\ifmmode\pm\else\textpm\fi{}}$, and nonresonant ${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$, and determine the ${\mathit{D}}_{\mathit{s}}^{\ifmmode\pm\else\textpm\fi{}}$ mass. In addition, we measure the relative branching ratios for the decays of ${\mathit{D}}_{\mathit{s}}^{\ifmmode\pm\else\textpm\fi{}}$ and ${\mathit{D}}^{\ifmmode\pm\else\textpm\fi{}}$ into \ensuremath{\varphi}${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$ and nonresonant ${\mathit{K}}^{+}$${\mathit{K}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{+}$${\mathrm{\ensuremath{\pi}}}^{\mathrm{\ensuremath{-}}}$${\mathrm{\ensuremath{\pi}}}^{\ifmmode\pm\else\textpm\fi{}}$.

P791: Continued study of heavy flavors at TPL

Abstract: J.C. Anjos, J.A. Appel, I. Bediaga, S.B. Bracker, L. Cremaldi, C. Darling, S. Dhawan, D. Errede, S. Hansen, J.G. Hissong, C. James, T. Kafka, D. Kaplan, P.E. Karchin, 1. Leedom, P.W. Lucas, L Lueking, R.D. Majka, P.M. Mantsch, J. Marques de Miranda, R. Milburn, J. Torres de Mello, A. Napier, T. Nash, M. Purohit, A. Correa dos Reis, S. Reucroft, F .S. Rotondo, J. Sandweiss, A.F.S. Santoro, J. Schneps, M. Sheaff, A.J. Slaughter, M.H.G. Souza, W.J. Spalding, C. Stoughton, M.E. Streetman, D. Summers, S. Takach, E.J. Wolin