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CERN Document Server Encontrados 63 registros  1 - 10siguientefinal  ir al registro: La búsqueda tardó 0.59 segundos. 
1.
Precision electroweak measurements on the $Z$ resonance / ALEPH Collaboration
We report on the final electroweak measurements performed with data taken at the Z resonance by the experiments operating at the electron-positron colliders SLC and LEP. The data consist of 17 million Z decays accumulated by the ALEPH, DELPHI, L3 and OPAL experiments at LEP, and 600 thousand Z decays by the SLD experiment using a polarised beam at SLC. [...]
hep-ex/0509008; SLAC-R-774; CERN-PH-EP-2005-041; SLAC-R-774; CERN-L3-304.- Geneva : CERN, 2006 - 302 p. ALEPH Papers - Published in : Phys. Rep. 427 (2006) 257 Fulltext: phep-2005-041 - PDF; arXiv:hep-ex_0509008 - PDF; External link: SLAC Document Server
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2.
Measurement of Hadronic Cross Sections and Asymmetries on the Z-Resonance / Kuijten, Hendrikus Petrus
Geneva : CERN, 1996.

Full text - CERN library copies
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3.
Measurements of Cross Sections and Forward-Backward Asymmetries at the Z Resonance and Determination of Electroweak Parameters / L3 collaboration
We report on measurements of hadronic and leptonic cross sections and leptonic forward-backward asymmetries performed with the L3 detector in the years $1993-95$.A total luminosity of 103 pb$^{-1}$ was collected at centre-of-mass energies $\sqrt{s} \approx m_\mathrm{Z}$ and $\sqrt{s} \approx m_\mathrm{Z} \pm 1.8$ GeVwhich corresponds to 2.5 million hadronic and 245 thousand leptonic events selected.These data lead to a significantly improved determination of Z parameters.From the total cross sections, combined with our measurements in $1990-92$,we obtain the final results:%%%\begin{eqnarr ay*} m_\mathrm{Z} = 91189.8 \pm 3.1\ \mathrm{MeV} \, , & & \Gamma_\mathrm{Z} = 2502.4 \pm 4.2\ \mathrm{MeV} \, , \\ \Gamma_\mathrm{had} = 1741.1 \pm 3.8\ \mathrm{MeV} \, , & & \Gamma_\ell = 84.14 \pm 0.17\ \mathrm{MeV} \,. \label{eq:Zpara_abstract}\end{eqnarray*}%%%An invisible width of $\Gamma_\mathrm{inv} = 499.1 \pm 2.9$ MeV is derived which in the Standard Model yields for the numberof light neutrino species $N_\nu = 2.978 \pm 0.014$.Adding our results on the leptonic forward-backward asymmetries and thetau polarisation, the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons are determined to be $\bar{g}_{\mathrm{V}}^\ell = -0.0397\pm 0.0017$ and $\bar{g}_{\mathrm{A}}^\ell = -0.50153 \pm 0.00053$.Including our measurements of the Z $\rightarrow \mathrm{b}\bar{\mathrm{b}}$ forward-backward and quark charge asymmetries a value for the effective electroweakmixing angle of $\sin^2\!\overline{\theta}_{\mathrm{W}} = 0.23093 \pm 0.00066$ is derived. [...]
hep-ex/0002046; CERN-EP-2000-022; CERN-EP-2000-022; CERN-L3-202.- Geneva : CERN, 2000 - 97 p. - Published in : Eur. Phys. J. C 16 (2000) 1-40 Fulltext: ep-2000-022 - PDF; arXiv:hep-ex_0002046 - PDF; External link: Preprint - Please contact the library if you need to access this document.
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4.
Search for Charginos with a Small Mass Difference to the Lightest Supersymmetric Particle at $\sqrt{s} = 189 GeV$ / L3 collaboration
A search for charginos nearly mass-degenerate with the lightestsupersymmetric particle isperformed using the 176 {pb$^{-1}$ of data collected at 189 {Ge\kern -0.1em V} in 1998 with the L3detector. Mass differences between the chargino and the lightest supersymmetric particlebelow 4 {Ge\kern -0.1em V} are considered.The presence of a high transverse momentum photon is required to single out the signal from the photon-photon interaction background. [...]
hep-ex/0002043; CERN-EP-2000-018; CERN-EP-2000-018; CERN-L3-201.- Geneva : CERN, 2000 - 19 p. - Published in : Phys. Lett. B 482 (2000) 31-42 Fulltext: ep-2000-018 - PDF; arXiv:hep-ex_0002043 - PDF; External link: Preprint - 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 : Encontrados 63 registros   1 - 10siguientefinal  ir al registro:
Vea también: autores con nombres similares
3 Kuijten, H.
1 Kuijten, Hendrikus Petrus
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