arXiv subjects

F. Abe et al

Publications and source records attributed to F. Abe et al.

5 recordsLinked to original sources

arXiv1998

Observation of B^+ -> psi(2S) K^+ and B^0 -> psi(2S) K^*(892)^0 Decays and Measurements of B-Meson Branching Fractions into J/psi and psi(2S) Final States

We report the observations of the decays B^+ -> psi(2S) K^+ and B^0 -> psi(2S) K^*(892)^0 in ppbar collisions at a center-of-mass energy of 1.8 TeV using a 110 pb^{-1} data sample recorded by the Collider Detector at Fermilab. We also reconstruct the decays B^+ -> J/psi K^+ and B^0 -> J/psi K^*(892)^0 and measure the six ratios of branching fractions of these four decays. The relative branching-fraction results are shown to be consistent with phenomenological factorization calculations of hadronic B-meson decays. We use the world-average branching fraction Br(B^+ -> J/psi K^+) to derive Br(B^+ -> psi(2S) K^+) = (0.56 +/- 0.08 +/- 0.10) x 10^{-3}, Br(B^0 -> psi(2S) K^*(892)^0) = (0.92 +/- 0.20 +/- 0.16) x 10^{-3}, and Br(B^0 -> J/psi K^*(892)^0) = (1.78 +/- 0.14 +/- 0.29) x 10^{-3}, where the first and second uncertainties are statistical and systematic, respectively.

hep-ex↗

arXiv1998

Searches for New Physics in Diphoton Events in proton anti-proton collisions at sqrt(s)=1.8TeV

We present a detailed description of a search for anomalous production of missing E_T ($\mett$), jets, leptons ($e, μ, τ$), b-quarks, or additional photons in events containing two isolated, central ($|η|<1.0$) photons with $\Et > 12$ GeV}. The results are consistent with standard model expectations, with the possible exception of one event that has in addition to the two photons a central electron, a high-E_T electromagnetic cluster, and large $\mett$. We set limits using two specific SUSY scenarios for production of diphoton events with $\mett$.

hep-ex↗

arXiv1998

Measurement of the CP-Violation Parameter $\sin(2β)$ in $B^0_d/\bar{B}{^0_d} \to J/ψK^0_S$ Decays

We present a measurement of the time-dependent asymmetry in the rate for $\bar{B}{^0_d}$ versus $B^0_d$ decays to $J/ψK^0_S$. In the context of the Standard Model this is interpreted as a measurement of the CP-violation parameter $\sin(2β)$. A total of $198\pm 17$ $B^0_d/\bar{B}{^0_d}$ decays were observed in $p\bar{p}$ collisions at $\sqrt{s} = 1.8$ TeV by the CDF detector at the Fermilab Tevatron. The initial $b$-flavor is determined by a same side flavor tagging technique. Our analysis results in $\sin(2β) = 1.8\pm 1.1(stat)\pm 0.3(syst)$.

hep-ex↗

arXiv1998

Search for Chargino-Neutralino Associated Production at the Fermilab Tevatron Collider

We have searched in $p \bar{p}$ collisions at $\sqrt{s}$ = 1.8 TeV for events with three charged leptons and missing transverse energy. In the Minimal Supersymmetric Standard Model, we expect trilepton events from chargino-neutralino ($\chione \chitwo$) pair production, with subsequent decay into leptons. We observe no candidate $e^+e^-e^\pm$, $e^+e^-μ^\pm$, $e^\pmμ^+μ^-$ or $μ^+μ^-μ^\pm$ events in 106 pb$^{-1}$ integrated luminosity. We present limits on the sum of the branching ratios times cross section for the four channels: $σ_{\chione\chitwo}\cdot $BR$(\chione\chitwo\to 3\ell+X) < 0.34$~pb, M$_\chione > $ 81.5 \mgev\sp and M$_\chitwo > $ 82.2 \mgev\sp for $\tanβ=2$, $μ=-600$~\mgev\sp and M$_\squark=$ M$_\gluino$.

hep-ex↗

arXiv1998

Searches for New Physics in Diphoton Events in proton anti-proton collisions at sqrt(s)=1.8TeV

We have searched for anomalous production of missing E$_{\rm T}$ ($\mett$), jets, leptons ($e, μ, τ$), $b$-quarks, or additional photons in events containing two isolated, central \mbox{($|η|<1.0$)} photons with \mbox{$\Et>12$~GeV}. The results are consistent with standard model expectations, with the possible exception of one event that has in addition to the two photons a central electron, a high-E$_{\rm T}$ electromagnetic cluster, and large $\mett$. We set limits using two specific SUSY scenarios for production of diphoton events with $\mett$.

hep-ex↗