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CERN Document Server Pronađeno je 40 zapisa  1 - 10slijedećikraj  idi na zapis: Pretraživanje je potrajalo 0.76 sekundi 
1.
$\Upsilon$ production in Z Decays / L3 Collaboration
We have searched for evidence of Upsilon production in 3.5 million hadronic Z decays collected by the L3 detector at LEP in 1991-1995. No signals are observed for the decay chain Z -> Upsilon X; Upsilon -> l+l- (l= e, mu), therefore upper limits at the 95% confidence level are set on the following Z branching fractions: BR (Z -> Upsilon(1S) X) < 5.5 x 10**-5; BR (Z -> Upsilon(2S) X) < 13.9 x 10**-5; BR (Z -> Upsilon(3S) X) < 9.4 x 10**-5..
CERN-PPE-97-078; CERN-L3-126.- Geneva : CERN, 1997 - 10 p. - Published in : Phys. Lett. B 413 (1997) 167-175 Fulltext: PDF; - Please contact the library if you need to access this document.
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2.
Study of hadronic events and measurements of $\alpha_{s}$ between 30 and 91 GeV / L3 Collaboration
We have studied the structure of hadronic events with a hard, %radiated isolated photon in the final state ($\mathrm{e^{+}e^{-}} \rightarrow$ Z $\rightarrow$ hadrons $+$ $\gamma$) in the 3.6 million hadronic data collected with the L3 detector at centre-of-mass energies around 91 GeV. The centre-of-mass energy of the hadronic system is in the range 30 GeV to 86 GeV [...]
CERN-PPE-97-074; CERN-L3-122.- Geneva : CERN, 1997 - 20 p. - Published in : Phys. Lett. B 411 (1997) 339-353 Fulltext: PDF; - Please contact the library if you need to access this document.
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3.
Resonance formation in the $\pi^+\pi^-\pi^0$ final state in two-photon collisions / L3 Collaboration
A study of resonance formation is presented in the $\pi^+\pi^-\pi^0$ final state in two-photon collisions at LEP. The $a_2(1320)$ radiative width is measured to be $\Gamma_{\gamma\gamma}=0.98\pm0.05\pm0.09$ keV{}. [...]
CERN-PPE-97-068; CERN-L3-121.- Geneva : CERN, 1997 - 19 p. - Published in : Phys. Lett. B 413 (1997) 147-158 Fulltext: PDF; - Please contact the library if you need to access this document.
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4.
$K^{0}_{S}$ and $\Lambda$ production in quark and gluon jets at LEP / L3 Collaboration
A measurement of the $\mathrm{K^0_s}$ and $\Lambda$ inclusive production rates and momentum spectra in two- and three-jet events is presented. On the basis of about 3.1~million Z decays collected with the L3 detector at LEP, we observe that the production of these particles is well modeled by string fragmentation..
CERN-PPE-97-050; CERN-L3-118.- Geneva : CERN, 1997 - 19 p. - Published in : Phys. Lett. B 407 (1997) 389-401 Fulltext: PDF; - Please contact the library if you need to access this document.
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5.
Inclusive J, $\psi$' and $\chi_c$ Production in Hadronic Z Decays / L3 Collaboration
\mathrm{ Br(Z \rightarrow \chi_{c2} + X) < 3.2\,\times\,10^{-3}}..
CERN-PPE-97-044; CERN-L3-114.- Geneva : CERN, 1997 - 17 p. - Published in : Phys. Lett. B 407 (1997) 351-360 Fulltext: PDF; - Please contact the library if you need to access this document.
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6.
Production of e, $\mu$ and $\tau$ Pairs in Untagged Two-Photon Collisions at LEP / L3 Collaboration
The two-photon collision reaction e+e- --> e+e-l+l- has been studied at root(s) ~ 91 GeV using the L3 detector at LEP for l = e, muon , tau. We have analysed untagged configurations where the two photons are quasi-real. [...]
CERN-PPE-97-043; CERN-L3-113.- Geneva : CERN, 1997 - 18 p. - Published in : Phys. Lett. B 407 (1997) 341-350 Fulltext: PDF; - Please contact the library if you need to access this document.
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7.
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.
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8.
Détermination d'une limite sur le rapport de branchement du processus rare $b \rightarrow s \gamma$ avec le détecteur L3 au LEP / Dorne, I
LAPP-T-96-03. - Annecy-le-Vieux : Lab. Annecy Phys. Part., 1996. - 189 p.

Full text - CERN library copies
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9.
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.
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10.
Measurement of Inclusive $\omega$ and $\eta$' Production in Hadronic Z Decays / L3 Collaboration
We present a study of the inclusive $\omega$ and $\eta^{\prime}$ production based on 3.1 million hadronic Z decays recorded with the L3 detector at LEP during 1991--1994. The production rates per hadronic Z decay have been measured to be $1.17 \pm 0.17 $ $\omega$ mesons and $0.25 \pm 0.04 $ $\eta^{\prime}$ mesons [...]
CERN-PPE-96-171; CERN-L3-106.- Geneva : CERN, 1997 - 19 p. - Published in : Phys. Lett. B 393 (1997) 465-476 Fulltext: PDF; - Please contact the library if you need to access this document.
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