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Determination of the number of light neutrino species from single photon production at LEP / L3 Collaboration
A determination of the number of light neutrino families performed by measuring the cross section of single photon production in \ee\ collision near the \Zo\ resonance is reported. From an integrated luminosity of $100~\mathrm{pb^{-1}}$, collected during the years 1991--94, we have observed 2091 single photon candidates with an energy above 1~\GeV\ in the polar angular region $45^\circ < \theta_\gamma < 135^\circ$ [...]
CERN-EP-98-025; CERN-L3-141.- Geneva : CERN, 1998 - 16 p. - Published in : Phys. Lett. B 431 (1998) 199 Fulltext: PDF; - Please contact the library if you need to access this document.

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(91)

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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(90)

Measurement of the $e^+ e^- \to Z \to b\overline{b}$ forward-backward asymmetry and the $B^{0}\overline{B}^0$ mixing parameter using prompt leptons / L3 Collaboration
The time-integrated $\mathrm{B}^{0}\bar{\mathrm{B}}^{0}$ mixing parameter and the forward-backward charge asymmetry in the process $\mathrm{e}^{+}\mathrm{e}^{-} \rightarrow \mathrm{b}\bar{\mathrm{b}}$ are measured in hadronic \Z events containing prompt muons or electrons, collected by the L3 experiment in the years 1990 to 1995. The total sample of 3.3 million hadronic $\mathrm{Z}$ events with a mean centre-of-mass energy of 91.26 GeV yields: \begin{eqnarray*} \mbox{$A_{\mathrm{FB}}^{\mathrm{b} }$} & = & 0.0960 \pm 0.0066(stat.) \pm 0.0033(sys.) \,, \\ %corel-6 \mbox{$\chi_{\mathrm{b}}$} & = & 0.1192 \pm 0.0068(stat.) \pm 0.0051(sys.) \, [...]
CERN-EP-98-156; CERN-L3-163.- Geneva : CERN, 1999 - 16 p. - Published in : Phys. Lett. B 448 (1999) 152-162 Fulltext: PDF; - Please contact the library if you need to access this document.

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(81)

$\chi_{c2}$ formation in two-photon collisions at LEP ; rev. version / L3 Collaboration
Two-photon formation of the charmonium resonance $\chi_{{\rm c}2}$ has been studied with the L3 detector at LEP. The $\chi_{{\rm c}2}$ is identified through its decay $\chi_{{\rm c}2} \rightarrow \gamma {\rm J}$, with a subsequent decay ${\rm J} \rightarrow {\mathrm{e^+ e^-}}$ or ${\rm J} \rightarrow {\mathrm{\mu^+ \mu^-}}$. [...]
CERN-EP-98-184; CERN-L3-165.- Geneva : CERN, 1999 - 14 p. - Published in : Phys. Lett. B 453 (1999) 73-82 Fulltext: PDF; - Please contact the library if you need to access this document.

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(80)

Study of the hadronic photon structure function $F^\gamma_2$ at LEP / L3 Collaboration
The hadronic photon structure function $F^\gamma_2$ is studied in the reaction $\mathrm{e^+e^-} \rightarrow \mathrm{e^+e^-hadrons}$ at LEP with the L3 detector. The data, collected from 1991 to 1995 at a centre-of-mass energy $\sqrt{s} \simeq 91 \GeV$, correspond to an integrated luminosity of 140~pb$^{-1}$. [...]
CERN-EP-98-098; CERN-L3-149.- Geneva : CERN, 1998 - 19 p. - Published in : Phys. Lett. B 436 (1998) 403 Fulltext: PDF; - Please contact the library if you need to access this document.

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(79)

Search for new physics in energetic single photon production in $e^+ e^-$ annihilation at the Z resonance / L3 Collaboration
Using a sample of $\mathrm{e^{+}e^{-}}$ annihilation events collected with the L3 detector at the Z resonance corresponding to an integrated luminosity of 137 pb$^{-1}$, we have searched for anomalous production of $\gamma \mathrm{X}$ final states where $\mathrm{X}$ represents stable, weakly interacting particles and the photon energy is greater than 15 GeV. The sample of events found is consistent with Standard Model expectations. [...]
CERN-PPE-97-082; CERN-L3-128.- Geneva : CERN, 1997 - 13 p. - Published in : Phys. Lett. B 412 (1997) 201-209 Fulltext: PDF; - Please contact the library if you need to access this document.

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(79)

Measurement of the Weak Dipole Moments of the $\tau$ Lepton / L3 Collaboration
Using the data collected by the L3 experiment at LEP from 1991 to 1995 at energies around the $\Zo$ mass, a measurement of the weak anomalous magnetic dipole moment, $a^w_{\tau}$,~ and of the weak electric dipole moment, $d^w_{\tau}$, of the $\tau$ lepton is performed. These quantities are obtained from angular distributions in $e^{+}e^{-}\rightarrow\tau^{+}\tau^{-} \rightarrow h^{+} \bar{\nu}_{\tau} h^{-} \nu_{\tau}$, where $h$ is a $\pi$ or a $\rho$. [...]
CERN-EP-98-015; CERN-L3-138.- Geneva : CERN, 1998 - 14 p. - Published in : Phys. Lett. B 426 (1998) 207-216 Fulltext: PDF; - Please contact the library if you need to access this document.

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(76)

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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(76)

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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(75)

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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