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CERN Document Server 找到 2,029 筆記錄  1 - 10下一個最後  跳到記錄: 檢索需時 1.35 秒. 
1.
(100)
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.
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2.
(91)
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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3.
(87)
Production of Single W Bosons at LEP / L3 Collaboration
We report on the observation of single W boson production in a data sample collected by the L3 detector at LEP2. The signal consists of large missing energy final states with a single energetic lepton or two hadronic jets. [...]
CERN-PPE-97-028; CERN-L3-112.- Geneva : CERN, 1997 - 17 p. - Published in : Phys. Lett. B 403 (1997) 168-176 Fulltext: PDF; - Please contact the library if you need to access this document.
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4.
(80)
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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5.
(79)
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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6.
(77)
Measurement of the $B_{d}^{0} - \overline{B}_{d}^{0}$ oscillation frequency / L3 Collaboration
Time-dependent ${\mathrm{B^{0}}\mbox{-}\bar{\mathrm{B}} ^{0}}$ mixing is studied using about two million hadronic Z decays registered by L3 in 1994 and 1995. For this study three techniques are used [...]
CERN-EP-98-028; CERN-L3-142.- Geneva : CERN, 1998 - 18 p. - Published in : Eur. Phys. J. C 5 (1998) 195-203 Fulltext: PDF; - Please contact the library if you need to access this document.
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7.
(76)
Search for neutral charmless B decays at LEP / L3 Collaboration
A search for rare charmless decays of \Bd and \Bs mesons has been performed in the exclusive channels \Bd_{(\mathrm s)}\ra\eta\eta, \Bd_{(\mathrm s)}\ra\eta\pio and \Bd_{(\mathrm s)}\ra\pio\pio. The data sample consisted of three million hadronic \Zo decays collected by the L3 experiment at LEP from 1991 through 1994. [...]
CERN-PPE-95-124; CERN-L3-086.- Geneva : CERN, 1995 - 15 p. - Published in : Phys. Lett. B 363 (1995) 127-136 Access to fulltext document: PDF; - Please contact the library if you need to access this document.
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8.
(75)
Measurement of the inclusive charmless semileptonic branching fraction of beauty hadrons and a determination of |$V_{ub}$| at LEP / L3 Collaboration
A measurement of the inclusive charmless semileptonic branching fraction of beauty hadrons, $\mathrm{b}\rightarrow\mathrm{X}_\mathrm{u }\ell\nu$, has been performed using almost two million hadronic Z decays collected by the L3 experiment at LEP, yielding the result: \begin{displaymath} \mathrm{Br}(\mathrm{b}\rightarrow\mathrm{X}_\mathr m{u}\ell\nu) = (3.3 \pm 1.0 \pm 1.7)\times 10^{-3}. \end{displaymath} The first uncertainty is statistical and the second is systematic. [...]
CERN-EP-98-097; CERN-L3-152.- Geneva : CERN, 1998 - 19 p. - Published in : Phys. Lett. B 436 (1998) 174-186 Fulltext: PDF; - Please contact the library if you need to access this document.
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9.
(71)
A precise measurement of the $B^{0}_{d}$ meson lifetime using a new technique / DELPHI Collaboration
From data recorded by DELPHI between 1991 and 1994, which correspond to 3.2 million hadronic $\mbox{Z}^0$ decays, a measurement of the $\Bdb$ meson lifetime has been performed based on the inclusive reconstruction of $3520 \pm 150$ semileptonic decays of the type \bc $\Bdb \rightarrow \Dstarp ~X~\ell^-~ \overline{\nu_{\ell}}, $ \ec The result is: \bc $\tau(\Bdb) = 1.537~\pm 0.041 (stat.) \pm 0.039 (syst.) ~\mathrm{ps}$. \ec \noindent The contribution to the systematic uncertainty which depends on external errors is $\pm 0.014~\mathrm{ps}$..
CERN-PPE-96-139.- Geneva : CERN, 1997 - 25 p. - Published in : Z. Phys. C 74 (1997) 19-32
- Published in : Z. Phys. C 75 (1997) 579 (Erratum) - CERN library copies
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10.
(70)
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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