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CERN Document Server 2,050 registres trobats  1 - 10següentfinal  anar al registre: La cerca s'ha fet en 1.38 segons. 
1.
(100)
Measurement of $D_{s}^{-} \to \tau^{-}\overline{\nu}_\tau$ and a New Limit for $B^- \to \tau^{- }\overline{\nu}_\tau$ / L3 Collaboration
Using a data sample of 1,475,000 $\ZQQG$ events collected during 1994 with the L3 detector at LEP, we have studied the purely leptonic decays of heavy flavour mesons, $\Dtau$ and $\Btau$. A signal is observed in the invariant mass distribution $\MDgamma$ corresponding to the decay sequence $\Dstar \rightarrow \gamma {\rm D^{-}_{s}}$, ~$\Dtau$, ~$\tauto \lnunu$ [...]
CERN-PPE-96-198; CERN-L3-109.- Geneva : CERN, 1997 - 18 p. - Published in : Phys. Lett. B 396 (1997) 327-337 Fulltext: PDF; - Please contact the library if you need to access this document.
Registre complet - Registres semblants
2.
(91)
Measurement of the anomalous magnetic and electric dipole moments of the $\tau$ lepton / L3 Collaboration
CERN-EP-98-045; CERN-L3-144.- Geneva : CERN, 1998 - Published in : Phys. Lett. B 434 (1998) 169-179 Fulltext: PDF; - Please contact the library if you need to access this document.
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3.
(89)
Measurement of the Weak Dipole Moments of the $\tau$ Lepton / L3 Collaboration
Using the data collected by the L3 experiment at LEP from 1991 to 1995 at energies around the $\Zo$ mass, a measurement of the weak anomalous magnetic dipole moment, $a^w_{\tau}$,~ and of the weak electric dipole moment, $d^w_{\tau}$, of the $\tau$ lepton is performed. These quantities are obtained from angular distributions in $e^{+}e^{-}\rightarrow\tau^{+}\tau^{-} \rightarrow h^{+} \bar{\nu}_{\tau} h^{-} \nu_{\tau}$, where $h$ is a $\pi$ or a $\rho$. [...]
CERN-EP-98-015; CERN-L3-138.- Geneva : CERN, 1998 - 14 p. - Published in : Phys. Lett. B 426 (1998) 207-216 Fulltext: PDF; - Please contact the library if you need to access this document.
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4.
(88)
Measurement of $\tau$ polarisation at LEP / L3 Collaboration
Using the data collected with the L3 detector at LEP between 1990 and 1995, corresponding to an integrated luminosity of 149 pb$^{-1}$, the $\tau$ longitudinal polarisation has been measured as a function of the production polar angle using the $\tau$ decays \thad\ ($\rm h = \pi, \rho, \aone$) and \tlep\ ($\rm \ell = e, \mu$). From this measurement the quantities æl~and \at, which depend on the couplings of the electron and the $\tau$ to the Z, are determined to be $\ael = 0.1678 \pm 0.0127 \pm 0.0030 $ and $\at = 0.1476 \pm 0.0088 \pm 0.0062$, consistent with the hypothesis of e--$\tau$ universality. [...]
CERN-EP-98-026; CERN-L3-140.- Geneva : CERN, 1998 - 19 p. - Published in : Phys. Lett. B 429 (1998) 387-398 Fulltext: PDF; - Please contact the library if you need to access this document.
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5.
(87)
Measurement of the average lifetime of b-hadrons in Z decays / L3 Collaboration
We present a measurement of the average b-hadron lifetime ${\rm \tau_b}$ at the $\mathrm{e^+e^-} \, $ collider LEP. Using hadronic Z decays collected in the period from 1991 to 1994, two independent analyses have been performed [...]
CERN-PPE-97-127; CERN-L3-134.- Geneva : CERN, 1998 - 19 p. - Published in : Phys. Lett. B 416 (1998) 220-232 Fulltext: PDF; - Please contact the library if you need to access this document.
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6.
(85)
Measurement of the Michel parameters and the average $\tau$-neutrino helicity from $\tau$ decays at LEP / L3 Collaboration
Four of the Michel parameters and the average tau-neutrino helicity have been measured by analysing tau decay spectra in 147 \pb ~of data collected by the L3 detector. The decays \tte, ~\ttm, ~\ttp, ~\ttr ~and their charge conjugates were considered. [...]
CERN-EP-98-123; CERN-L3-156.- Geneva : CERN, 1998 - 15 p. - Published in : Phys. Lett. B 438 (1998) 405 Fulltext: PDF; - Please contact the library if you need to access this document.
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7.
(84)
Upper limit on the lifetime difference of short- and long-lived $B^0_s$ mesons / L3 Collaboration
An upper limit on the lifetime difference of short- and long-lived $\rm B^0_s$ mesons has been obtained using an inclusive bottom hadron sample from 2 million hadronic Z decays collected by the L3 experiment at LEP. A lifetime fit has been performed on data samples separately enriched in neutral and charged b hadrons. [...]
CERN-EP-98-127; CERN-L3-159.- Geneva : CERN, 1998 - 17 p. - Published in : Phys. Lett. B 438 (1998) 417-429 Fulltext: PDF; - Please contact the library if you need to access this document.
Registre complet - Registres semblants
8.
(78)
Measurement of the Lifetime of the $\tau$ Lepton / L3 Collaboration
The lifetime of the tau lepton is measured using data collected in 1994 by the L3 detector at LEP. The precise track position information of the Silicon Microvertex Detector is exploited. [...]
CERN-PPE-96-124; CERN-L3-103.- Geneva : CERN, 1996 - 14 p. - Published in : Phys. Lett. B 389 (1996) 187-196 Fulltext: PDF; - Please contact the library if you need to access this document.
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9.
(78)
Search for Excited Leptons in $e^+ e^-$ Annihilation at $\sqrt{s}$ = 161 GeV / L3 Collaboration
A search for excited leptons $\rm e^*,~\mu^*, ~\tau^*$ and $\nu_{\rm e}^*$ in $\rm e^+e^-$ collisions at $\rm \sqrt{s}$ = 161 GeV is performed using the $\rm 10.8 ~pb^{-1}$ of data collected by the L3 detector at LEP. No evidence has been found for their existence. [...]
CERN-PPE-97-012; CERN-L3-110.- Geneva : CERN, 1997 - 15 p. - Published in : Phys. Lett. B 401 (1997) 139-149 Fulltext: PDF; - Please contact the library if you need to access this document.
Registre complet - Registres semblants
10.
(78)
Determination of the number of light neutrino species from single photon production at LEP / L3 Collaboration
A determination of the number of light neutrino families performed by measuring the cross section of single photon production in \ee\ collision near the \Zo\ resonance is reported. From an integrated luminosity of $100~\mathrm{pb^{-1}}$, collected during the years 1991--94, we have observed 2091 single photon candidates with an energy above 1~\GeV\ in the polar angular region $45^\circ < \theta_\gamma < 135^\circ$ [...]
CERN-EP-98-025; CERN-L3-141.- Geneva : CERN, 1998 - 16 p. - Published in : Phys. Lett. B 431 (1998) 199 Fulltext: PDF; - Please contact the library if you need to access this document.
Registre complet - Registres semblants

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