D. L. Wagner

Measurements of the Branching Fractions of Exclusive Charmless B Meson Decays with η′ or ω Mesons

B. Aubert, D. Boutigny, J.-M. Gaillard, A. Hicheur et autres

We present the results of searches for $B$ decays to charmless two-body final states containing ${\ensuremath{\eta}}^{\ensuremath{'}}$ or $\ensuremath{\omega}$ mesons, based on $20.7{\mathrm{fb}}^{\ensuremath{-}1}$ of data collected with the BABAR detector. We find the branching fractions $B({B}^{+}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}(70\ifmmode\pm\else\textpm\fi{}8\ifmmode\pm\else\textpm\fi{}5)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, $B({B}^{0}\ensuremath{\rightarrow}{\ensuremath{\eta}}^{\ensuremath{'}}{K}^{0})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({42}_{\ensuremath{-}11}^{+13}\ifmmode\pm\else\textpm\fi{}4)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, and $B({B}^{+}\ensuremath{\rightarrow}\ensuremath{\omega}{\ensuremath{\pi}}^{+})\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}({6.6}_{\ensuremath{-}1.8}^{+2.1}\ifmmode\pm\else\textpm\fi{}0.7)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}$, where the first error …

fr, it, cn, no, us, gb, de, ca, ru (code pays fourni par la source)

First Symmetry Tests in Polarized Z0 Decays to bb¯g

Koya Abe, Kenji Abe, K. Abe, И. Адам et autres

We have made the first direct symmetry tests in the decays of polarized Z0 bosons into fully identified bbg states, collected in the SLD experiment at SLAC. We searched for evidence of parity violation at the bbg vertex by studying the asymmetries …

jp, us, gb, it, ru, kr (code pays fourni par la source)

Search for charmless hadronic decays of B mesons with the SLAC SLD detector

Kenji Abe, Koya Abe, K. Abe, И. Адам et autres

Based on a sample of approximately 500 000 hadronic ${Z}^{0}$ decays accumulated between 1993 and 1998, the SLD experiment has set limits on 24 fully charged two-body and quasi-two-body exclusive charmless hadronic decays of ${B}^{+},$ ${B}^{0},$ and ${B}_{s}^{0}$ mesons. The precise tracking …

jp, us, it, gb, ru, ca (code pays fourni par la source)

Direct Measurement of Ab and Ac at the Z0 Pole Using a Lepton Tag

Kenji Abe, Koya Abe, K. Abe, И. Адам et autres

The parity violation parameters ${A}_{b}$ and ${A}_{c}$ of the $\mathrm{Zb}\overline{b}$ and $\mathrm{Zc}\overline{c}$ couplings have been measured directly, using the polar angle dependence of the ${Z}^{0}$-pole polarized cross sections. Bottom and charmed hadrons were tagged via semileptonic decays. Both the muon and electron …

jp, us, gb, it, ru (code pays fourni par la source)

Direct Measurement of Ab in Z0 Decays Using Charged Kaon Tagging

Kenji Abe, Koya Abe, K. Abe, И. Адам et autres

We present a direct measurement of the parity-violating asymmetry ${A}_{b}$ in the ${Z}^{0}$ to $b\overline{b}$ coupling using a new technique to distinguish the $b$ and $\overline{b}$ quarks using charged kaons from $B$ decays. The ${Z}^{0}$ bosons are produced in ${e}^{+}{e}^{\ensuremath{-}}$ collisions at …

jp, us, gb, ru, it (code pays fourni par la source)

Measurement of the τ Neutrino Helicity and Michel Parameters in Polarized e+e− Collisions

K. Abe, T. Akagi, N. J. Allen, W. W. Ash et autres

We present a new measurement of the $\ensuremath{\tau}$ neutrino helicity ${h}_{{\ensuremath{\nu}}_{\ensuremath{\tau}}}$ and the $\ensuremath{\tau}$ Michel parameters $\ensuremath{\rho}$, $\ensuremath{\eta}$, $\ensuremath{\xi}$, and the product $\ensuremath{\delta}\ensuremath{\xi}$. The analysis exploits the highly polarized SLC electron beam to extract these quantities directly from a measurement of the …

jp, it, us, gb, ru, kr (code pays fourni par la source)

First Measurement of the Left-Right Charge Asymmetry in Hadronic Z Boson Decays and a New Determination of sin2θWeff

K. Abe, I. Abt, T. Akagi, N. J. Allen et autres

We present the first measurement of the left-right charge asymmetry ${A}_{Q}^{\mathrm{obs}}$ in hadronic $Z$ boson decays. This was performed at ${E}_{\mathrm{c}.\mathrm{m}.}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}91.27\mathrm{GeV}$ with the SLD at the SLAC Linear Collider with a polarized electron beam. Using 89 838 events we obtain ${A}_{Q}^{\mathrm{obs}}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.225\ifmmode\pm\else\textpm\fi{}0.056\ifmmode\pm\else\textpm\fi{}0.019$, which …

jp, us, no, gb, ru, it, kr (code pays fourni par la source)

First Measurement of the Left-Right Charge Asymmetry in Hadronic {ital Z} Boson Decays and a New Determination of sin{sup 2}{ital {theta}}{sup eff}{sub {ital W}}

R. Steiner, A. C. Benvenuti, J. A. Coller, S. Hedges et autres

We present the first measurement of the left-right charge asymmetry A{sup obs}{sub Q} in hadronic Z boson decays. This was performed at E{sub c.m.}=91.27 GeV with the SLD at the SLAC Linear Collider with a polarized electron beam. Using 89838 events we …

Search for rare kaon decays at BNL E791

D. L. Wagner