Accès ouvert
2000
article
OpenAlex
A. A. Affolder, H. Akimoto, A. Akopian, Michael G. Albrow et autres
An angular analysis of ${B}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}{K}^{*0}$ and ${B}_{s}^{0}\ensuremath{\rightarrow}J/\ensuremath{\psi}\ensuremath{\varphi}$ has been used to determine the decay amplitudes with parity-even longitudinal ( ${A}_{0}$) and transverse ( ${A}_{\ensuremath{\parallel}}$) polarization and parity-odd transverse ( ${A}_{\ensuremath{\perp}}$) polarization. The measurements are based on 190 ${B}^{0}$ and 40 ${B}_{s}^{0}$ candidates …
us, es, jp, it, tw, gb, ru, ch, ca
(code pays fourni par la source)
Accès ouvert
2000
article
OpenAlex
A. A. Affolder, H. Akimoto, A. Akopian, M. G. Albrow et autres
We have reconstructed the radiative decays ${\ensuremath{\chi}}_{b}(1P)\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1S)\ensuremath{\gamma}$ and ${\ensuremath{\chi}}_{b}(2P)\ensuremath{\rightarrow}\ensuremath{\Upsilon}(1S)\ensuremath{\gamma}$ in $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$, and measured the fraction of $\ensuremath{\Upsilon}(1S)$ mesons that originate from these decays. For $\ensuremath{\Upsilon}(1S)$ mesons with ${p}_{T}^{\ensuremath{\Upsilon}}>8.0\mathrm{GeV}/c$, the fractions that come from ${\ensuremath{\chi}}_{b}(1P)$ and ${\ensuremath{\chi}}_{b}(2P)$ decays are $[27.1\ifmmode\pm\else\textpm\fi{}6.9(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}4.4(\mathrm{syst})]%$ …
us, jp, es, it, tw, gb
(code pays fourni par la source)
1999
article
OpenAlex
F. Abe, H. Akimoto, A. Akopian, Michael G. Albrow et autres
We present a measurement of the mass difference $\ensuremath{\Delta}{m}_{d}$ of the two ${B}_{d}^{0}$ mass eigenstates. We use a flavor tagging method based on the lepton charge, in a sample of events with two muons at low transverse momentum. The sample corresponds to …
jp, us, it, tw, ch, ca
(code pays fourni par la source)
1999
article
OpenAlex
F. Abe, H. Akimoto, A. Akopian, M. Albrow et autres
The kinematic properties of $t\overline{t}$ events are studied in the $W+$multijet channel using data collected with the CDF detector during the 1992--1995 runs at the Fermilab Tevatron collider corresponding to an integrated luminosity of 109 pb${}^{\ensuremath{-}1}.$ Distributions of a variety of kinematic …
jp, us, it, tw, ca, ch
(code pays fourni par la source)
1998
article
OpenAlex
F. Abe, H. Akimoto, A. Akopian, M. G. Albrow et autres
We report a measurement of the fraction of dijet events with a rapidity gap between jets produced by color-singlet exchange in $\overline{p}p$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}630\mathrm{GeV}$ at the Fermilab Tevatron. In events with two jets of transverse energy ${E}_{T}^{\mathrm{jet}}>8\mathrm{GeV}$, pseudorapidity in the range …
jp, us, it, tw, ch
(code pays fourni par la source)
Accès ouvert
1998
article
OpenAlex
F. Abe, H. Akimoto, A. Akopian, Michael G. Albrow et autres
We observe hadronic $W$ decays in $t\overline{t}\ensuremath{\rightarrow}W(\ensuremath{\rightarrow}\ensuremath{\ell}\ensuremath{\nu})+\ensuremath{\ge}4$ jet events using a $109{\mathrm{pb}}^{\ensuremath{-}1}$ data sample of $p\overline{p}$ collisions at $\sqrt{s}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}1.8\mathrm{TeV}$ collected with the Collider Detector at Fermilab. A peak in the dijet invariant mass distribution is obtained that is consistent with $W$ decay …
jp, us, it, tw, ch
(code pays fourni par la source)