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CERN Document Server 找到 57 笔记录  1 - 10下一个最後  跳到记录: 检索需时 0.52 秒. 
1.
Decays of Bc Meson / Choi, M T
Geneva : CERN, 1997.
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2.
Pair-Production of W Bosons in $e^+ e^-$ Interactions at $\sqrt{s}$ = 161 GeV / L3 Collaboration
We report on the measurement of W-boson pair-production with the L3 detector at LEP at a centre-of-mass energy of 161.34~\GeV. In a data sample corresponding to a total luminosity of 11~pb$^{-1}$, we select four-fermion events with high invariant masses of pairs of hadronic jets or leptons [...]
CERN-PPE-97-014; CERN-L3-111.- Geneva : CERN, 1997 - 28 p. - Published in : Phys. Lett. B 398 (1997) 223-238 Fulltext: PDF; - Please contact the library if you need to access this document.
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3.
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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4.
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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5.
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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6.
Study of the Weak Charged Hadronic Current in b Decays / L3 Collaboration
Charged and neutral particle multiplicities of jets associated with identified semileptonic and hadronic b decays are studied. The observed differences between these jets are used to determine the inclusive properties of the weak charged hadronic current [...]
CERN-PPE-96-170; CERN-L3-107.- Geneva : CERN, 1997 - 15 p. - Published in : Phys. Lett. B 393 (1997) 477-486 Fulltext: PDF; - Please contact the library if you need to access this document.
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7.
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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8.
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.
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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10.
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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CERN Document Server : 找到 57 笔记录   1 - 10下一个最後  跳到记录:
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