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CERN Document Server Encontrados 2,051 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 0.87 segundos. 
1.
(100)
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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2.
(91)
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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3.
(91)
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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4.
(86)
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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5.
(85)
Measurement of the B$_{d}^{0}$ meson oscillation frequency / L3 Collaboration
Time-dependent \Bd-\Bbd\ mixing is studied using 1.5 million hadronic Z decays collected by L3. Semileptonic B decays are selected by requiring at least one reconstructed lepton in both thrust hemispheres [...]
CERN-PPE-96-073; CERN-L3-101.- Geneva : CERN, 1996 - 19 p. - Published in : Phys. Lett. B 383 (1996) 487-498 Fulltext: PDF; - Please contact the library if you need to access this document.
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6.
(81)
Search for Exclusive B Decays to J and $\eta$ or $\pi^{0}$ with the L3 Detector / L3 Collaboration
A search for exclusive decays of $\ensuremath{\mathrm{B_d^0}}$ and $\ensuremath{\mathrm{B_s^0}}$ mesons has been performed in the channels $\ensuremath{\mathrm{B_d^0}\rightarrow\mathrm{J}\eta}$,\,\, $\ensuremath{\mathrm{B_s^0}\rightarrow\mathrm{J}\eta}$,\,\, $\ensuremath{\mathrm{B_d^0}\rightarrow\mathrm{J}\pi^0}$ and $\ensuremath{\mathrm{B_s^0}\rightarrow\mathrm{J}\pi^0}$. The data sample consisted of more than three and half million hadronic $\ensuremath{\mathrm {Z}}$ decays collected by the L3 experiment at LEP from 1991 through 1995 [...]
CERN-PPE-96-152; CERN-L3-105.- Geneva : CERN, 1997 - 15 p. - Published in : Phys. Lett. B 391 (1997) 481-490 Fulltext: PDF; - Please contact the library if you need to access this document.
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7.
(78)
Cross-Section of Hadron Production in $\gamma\gamma$ Collisions at LEP / L3 Collaboration
The reaction $\mathrm{e}^{+} \mathrm{e}^{-} \rightarrow \mathrm{e}^{+} \mathrm{e}^{-} \gamma ^{*} \gamma ^{*} \rightarrow \mathrm{e}^{+} \mathrm{e}^{-} $ {\sl hadrons} is analysed using data collected by the L3 detector during the LEP runs at $\sqrt {s}$ = 130-140 GeV and $\sqrt {s}$ = 161 GeV. The cross sections $\sigma(\mathrm{e}^{+} \mathrm{e}^{-} \rightarrow \mathrm{e}^{+} \mathrm{e}^{-} $ {\sl hadrons}) and $\sigma (\gamma\gamma \rightarrow $ {\sl hadrons}) are measured in the interval 5 $\leq W_{\gamma\gamma} \leq$ 75 GeV [...]
CERN-PPE-97-048; CERN-L3-116.- Geneva : CERN, 1997 - 19 p. - Published in : Phys. Lett. B 408 (1997) 450-464 Fulltext: PDF;
In : 7th International Workshop on Deep Inelastic Scattering and QCD, Zeuthen, Germany, 19 - 23 Apr 1999, pp.283-286 - Please contact the library if you need to access this document.
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8.
(78)
Search for neutral B meson decays to two charged leptons / L3 Collaboration
The decays $\mathrm{B_d^0,\,B_s^0 \rightarrow e^+e^-,\,\mu^+\mu^-,\, e^\pm\mu^\mp}$ are searched for in 3.5 million hadronic ${\mathrm{Z}}$ events, which constitute the full LEP I data sample collected by the L3 detector. No signals are observed, therefore upper limits at the 90\%(95\%) confidence levels are set on the following branching fractions: % \begin{center}% {\setlength{\tabcolsep}{2pt} \begin{tabular}{lccccclcccc}% % Br$({\mathrm{B_d^0 \rightarrow {\mathrm{e^+e^-}}}})$ & $<$ & $1.4(1.8)$ & $\times$ & $ 10^{-5}$; & \hspace*{5mm} & Br$({\mathrm{B_s^0 \rightarrow {\mathrm{e^+e^-}}}})$ & $<$ & $5.4(7.0)$ & $\times$ & $ 10^{-5}$; \\% Br$({\mathrm{B_d^0 \rightarrow \mu^+\mu^-}})$ & $<$ & $1.0(1.4)$ & $\times$ & $ 10^{-5}$; & \hspace*{5mm} & Br$({\mathrm{B_s^0 \rightarrow \mu^+\mu^-}})$ & $<$ & $3.8(5.1)$ & $\times$ & $ 10^{-5}$; \\% Br$({\mathrm{B_d^0 \rightarrow {\mathrm{e^\pm\mu^\mp}}}})$ & $<$ & $1.6(2.0)$ & $\times$ & $ 10^{-5}$; & \hspace*{5mm} & Br$({\mathrm{B_s^0 \rightarrow {\mathrm{e^\pm\mu^\mp}}}})$ & $<$ & $4.1(5.3)$ & $\times$ & $ 10^{-5}$. [...]
CERN-PPE-96-151; CERN-L3-104.- Geneva : CERN, 1997 - 8 p. - Published in : Phys. Lett. B 391 (1997) 474-480 Fulltext: PDF; - Please contact the library if you need to access this document.
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9.
(74)
Measurement of W-pair cross sections in $e^+ e^-$ interactions at $\sqrt{s}$ = 172 GeV and W decay branching fractions / L3 Collaboration
We report on the measurement of W-boson pair-production with the L3 detector at LEP at an average centre-of-mass energy of 172.13~GeV. In a data sample corresponding to a total luminosity of 10.25~pb$^{-1}$ we select 110 four-fermion events with pairs of hadronic jets or leptons with high invariant masses. [...]
CERN-PPE-97-067; CERN-L3-120.- Geneva : CERN, 1997 - 21 p. - Published in : Phys. Lett. B 407 (1997) 419-431 Fulltext: PDF; - Please contact the library if you need to access this document.
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10.
(74)
$K^{0}_{S}$ 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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