Observation of weak neutral current neutrino production of J/ψJ/\psi

Observation of \jpsi production by neutrinos in the calorimeter of the CHORUS detector exposed to the CERN SPS wide-band \numu beam is reported. A spectrum-averaged cross-section $\sigma^{\mathrm{J/\psi}}$ = (6.3 $\pm$ 3.0) $\times \mathrm{10^{-41}~cm^{2}}$ is obtained for 20 GeV $\leq E_{\nu} \leq$ 200 GeV. The data are compared with the theoretical model based on the QCD Z-gluon fusion mechanism

Observation of weak neutral current neutrino production of J/ψJ/\psi

Observation of \jpsi production by neutrinos in the calorimeter of the CHORUS detector exposed to the CERN SPS wide-band \numu beam is reported. A spectrum-averaged cross-section $\sigma^{\mathrm{J/\psi}}$ = (6.3 $\pm$ 3.0) $\times \mathrm{10^{-41}~cm^{2}}$ is obtained for 20 GeV $\leq E_{\nu} \leq$ 200 GeV. The data are compared with the theoretical model based on the QCD Z-gluon fusion mechanism

New results from a search for νμ→ντ\nu_{\mu} \to \nu_{\tau} and νe→ντ\nu_{e} \to \nu_{\tau} oscillation

A first analysis of the complete set of data collected by CHORUS in the years 1994-1997 is presented. The search for \nut charged current events has been performed for both leptonic and hadronic decays of the \tauu lepton. No \tauu candidate has been found. A \numtonut mixing is excluded down to $\sin2t$ = $6.8 \times 10^{-4}$ for large \dm2 (90\%~C.L.)

New results from a search for νμ→ντ\nu_{\mu} \to \nu_{\tau} and νe→ντ\nu_{e} \to \nu_{\tau} oscillation

A first analysis of the complete set of data collected by CHORUS in the years 1994-1997 is presented. The search for \nut charged current events has been performed for both leptonic and hadronic decays of the \tauu lepton. No \tauu candidate has been found. A \numtonut mixing is excluded down to $\sin2t$ = $6.8 \times 10^{-4}$ for large \dm2 (90\%~C.L.)

New results from a search for v(mu) -> v(tau) and v(e) -> v(tau) oscillation

A first analysis of the complete set of data collected by CHORUS in the years 1994-1997 is presented. The search for nu (tau) charged current events has been performed for both leptonic and hadronic decays of the tau lepton. No tau candidate has been found, A nu (tau) --> nu (tau) mixing is excluded down to sin(2)2 theta (mu tau) = 6.8 x 10(-4) for large Deltam(2) (90% C.L.)

New results from a search for v(mu) -> v(tau) and v(e) -> v(tau) oscillation

A first analysis of the complete set of data collected by CHORUS in the years 1994-1997 is presented. The search for nu (tau) charged current events has been performed for both leptonic and hadronic decays of the tau lepton. No tau candidate has been found, A nu (tau) --> nu (tau) mixing is excluded down to sin(2)2 theta (mu tau) = 6.8 x 10(-4) for large Deltam(2) (90% C.L.)

New results from a search for v(mu) -> v(tau) and v(e) -> v(tau) oscillation

A first analysis of the complete set of data collected by CHORUS in the years 1994-1997 is presented. The search for nu (tau) charged current events has been performed for both leptonic and hadronic decays of the tau lepton. No tau candidate has been found, A nu (tau) --> nu (tau) mixing is excluded down to sin(2)2 theta (mu tau) = 6.8 x 10(-4) for large Deltam(2) (90% C.L.). (C) 2001 Elsevier Science B.V. All rights reserved