CERN Accelerating science

CERN Document Server 找到 14 筆記錄  1 - 10下一個  跳到記錄: 檢索需時 0.71 秒. 
1.
Measurement of Branching Fractions of $\tau$ Hadronic Decays / L3 Collaboration
Using data collected with the L3 detector at LEP at the Z peak, the branching fractions of the $\tau$ lepton into the hadronic final states, $h^- n\pi^0 \nu(n=0,1,2, >= 3)$ and $h^-h^+h^- n\pi^0 \nu$ where $h^\pm$ denotes a charged hadron, are measured to be .....
CERN-EP-2003-019 ; CERN-L3-270.
- 2003. - 17 p.
Fulltext - Fulltext
2.
Inclusive $D^{*\pm}$ production in two-photon collisions at LEP / L3 Collaboration
Inclusive D*/sup +or-/ production in two-photon collisions is studied with the L3 detector at LEP, using 683 pb/sup -1/ of data collected at centre-of-mass energies from 183 to 209 GeV. Differential cross sections are determined as functions of the transverse momentum and pseudorapidity of the D*/sup +or-/ mesons in the kinematic region 1 GeV<P/sub T/<12 GeV and $\beta$ <1.4. [...]
2002 - Published in : Phys. Lett. B 535 (2002) 59-69
3.
Measurements of the $b\overline{b}$ production cross section and forward-backward asymmetry at centre-of-mass energies above the Z pole at LEP / L3 Collaboration
The measurements of R/sub b/= sigma (e/sup +/e/sup -/ to bb)/ sigma (e/sup +/e/sup -/ to qq) and of the b quark forward-backward charge asymmetry, A/sub fb//sup b/, at centre-of-mass energies above the Z pole are described. The measurement of R/sub b/ is performed at square root (s) between 130 and 189 GeV using a b-tagging method that exploits the relatively large decay length of b-hadrons. [...]
Geneva : CERN, 2000 - Published in : Phys. Lett. B 485 (2000) 71-84
4.
Hadrons at LEP / L3 Collaboration
1999 - Published in : Phys. Lett. B 453 (1999) 333-42
5.
$\chi_{c2}$ formation in two-photon collisions at LEP / L3 Collaboration
1999 - Published in : Phys. Lett. B 453 (1999) 73-82
6.
Search for Scalar Leptons in $e^+ e^-$ collisions at $\sqrt{s}$= 183 GeV / L3 Collaboration
We report the result of a search for scalar leptons in $\mathrm{ e^+ e^-}$ collisions at 183 GeV centre-of-mass energy at LEP. No evidence for such particles is found in a data sample of 55.2 pb$^{-1}$. [...]
CERN-EP-99-024; CERN-L3-172.- Geneva : CERN, 1999 - 18 p. - Published in : Phys. Lett. B 456 (1999) 283-96 Fulltext: PDF; - Please contact the library if you need to access this document.
7.
Search for R-parity Violating Chargino and Neutralino Decays in $e^+ e^-$ Collisions up to $\sqrt{s}$= 183 GeV / L3 Collaboration
A search for chargino and neutralino pair production in $\mathrm{ e^+e^-}$ collisions at center-of-mass energies between 161~\textrm{Ge\kern -0.1em V} and 183~\textrm{Ge\kern -0.1em V} is performed under the assumptions that R-parity is not conserved and that only purely leptonic or hadronic R-parity violating decays are allowed. No signal is found in the data. [...]
CERN-EP-99-023; CERN-L3-173.- Geneva : CERN, 1999 - 20 p. - Published in : Phys. Lett. B 459 (1999) 354-366 Fulltext: PDF; - Please contact the library if you need to access this document.
8.
Study of Neutral-Current Four-Fermion and ZZ Production in $e^+ e^-$ Collisions at $\sqrt{s}$= 183 GeV / L3 Collaboration
Study of Neutral--Current Four--Fermion and ZZ \\ Production in $\rm e^+ e^-$ Collisions at $\rm \sqrt{s}=$ 183 GeV A study of neutral--current four--fermion processes is performed using a data sample corresponding to 55.3~pb$^{-1}$ of integrated luminosity collected by the L3 detector at LEP at an average centre--of--mass energy of $183~\GeV$. The neutral--current four--fermion cross sections for final states with a pair of charged leptons plus jets and with four charged leptons are measured to be consistent with the Standard Model predictions. [...]
CERN-EP-98-206; CERN-L3-169.- Geneva : CERN, 1999 - 23 p. - Published in : Phys. Lett. B 450 (1999) 281-93 Fulltext: PDF; - Please contact the library if you need to access this document.
9.
Measurement of the cross-section for the process $\gamma^* \gamma^* \to$ hadrons at LEP / L3 Collaboration
Measurements of the two-photon interaction e+e- --> e+e- hadrons at sqrt(s) = 91 GeV and sqrt(s) = 183 GeV are presented. The double-tag events, collected with the L3 detector, correspond to integrated luminosities of 140 pb-1 at 91 GeV and 52 pb-1 at 183 GeV. [...]
CERN-EP-98-205; CERN-L3-168.- Geneva : CERN, 1999 - 16 p. - Published in : Phys. Lett. B 453 (1999) 333-342 Fulltext: PDF; - Please contact the library if you need to access this document.
10.
Heavy Quarkonium Production in Z Decays / L3 Collaboration
We report measurements of the inclusive production of heavy quarkonium states in $\mathrm {Z}$ decays based on the analysis of 3.6 million hadronic events collected by the L3 detector at LEP. The measurement of inclusive J production and an improved $95\%$ confidence level upper limit on $\Upsilon$ production are presented [...]
CERN-EP-98-204; CERN-L3-167.- Geneva : CERN, 1999 - 18 p. - Published in : Phys. Lett. B 453 (1999) 94 Fulltext: PDF; - Please contact the library if you need to access this document.

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