Showing papers by "G. Chiefari published in 1999"
18 Jun 1999
1,107 citations
TL;DR: In this article, the effects of virtual graviton exchange in the process were investigated at the L3 detector at LEP at centre-of-mass energies up to 183\,GeV, and limits close to 1\,TeV on the scale of quantum gravity were set.
45 citations
TL;DR: In this paper, the L3 detector at LEP at a center-of-mass energy of 189 GeV was used to analyze single and multi-photon events with missing energy.
41 citations
TL;DR: In this paper, measurements of the two-photon interaction e+e- --> e-e- hadrons at the L3 detector were presented, where the double-tag events correspond to integrated luminosities of 140 pb-1 at 91 GeV and 52 pb1 at 183 GeV.
38 citations
TL;DR: In this article, Bose-Einstein correlations between like-sign charged pion pairs in hadronic Z~decays with the L3 detector at LEP were measured in three dimensions in the longitudinal center of mass system.
36 citations
TL;DR: In this article, an extra spatial dimension is proposed by recent theories that postulate the scale of gravity to be of the same order as the electroweak scale, and a sizeable interaction between gravitons and Standard Model particles is then predicted.
35 citations
TL;DR: In this paper, the evolution of F2 with Q2 is measured in the Q2 range from 1.2 GeV 2 to 30 GeV2, showing a linear growth with ln(Q2); the value of the slope (alpha-1)dF2(q2)/dln(Q 2 ) is calculated in two x bins from 0.01 to 0.2 and is higher than predictions.
28 citations
TL;DR: In this paper, a study of neutral current four-fermion processes is performed using a data sample corresponding to 55.3~pb$^{-1}$ of integrated luminosity collected by the L3 detector at LEP at an average centre-of-mass energy of $183~\GeV.
23 citations
TL;DR: In this article, the mass, decay width, and relative production rate of orbitally excited B mesons were measured using 1.25 million hadronic Z decays recorded by the L3 detector.
22 citations
TL;DR: In this paper, the two-photon formation of the charmonium resonance was studied with the L3 detector at LEP and the authors measured the twophoton width of the resonance to be \begin{center} $\Gamma_{\gamma-gamma}(\chi_{{\rm c}2})=1.
20 citations
TL;DR: In this paper, the mass and total decay width of the W boson were measured with the L3 detector at LEP, where the W-pair events produced in e+e- interactions between 161 GeV and 183 GeV centre-of-mass energy were selected in a data sample corresponding to a total luminosity of 76.7 pb-1.38 GeV.
TL;DR: In this article, the authors studied the pair production of Z bosons using the data collected by the L3 detector at LEP in 1998 in collisions at a centre-of-mass energy of 189\,GeV.
TL;DR: A search for heavy neutrinos that are isosinglets under the standard $SU(2)_L$ gauge group is made at center-of-mass energies 130 $< \sqrt{s} <$ 189 GeV with the L3 detector at LEP as mentioned in this paper.
TL;DR: In this article, the two-photon width of the L3 detector at LEP has been measured with the L 3 detector and the result is γ(γ(γ) = 6.9 \pm 1.7 \mbox{(stat.)} \pm 0.8 pb$ 2.0$(BR) keV.
TL;DR: In this paper, the authors report measurements of the inclusive production of heavy quarkonium states in Z decays based on the analysis of 3.6 million hadronic events collected by the L3 detector at LEP.
TL;DR: A search for pair-produced charged Higgs bosons was performed with the L3 detector at LEP using data collected at a centre-of-mass energy of 188.6 GeV, corresponding to an integrated luminosity of 176.4 pb −1 as discussed by the authors.
TL;DR: In this paper, the authors derived model-independent limits on production cross sections for the two decay channels t 1 →c χ 1 0 and b 1 →b χ 2 0.
TL;DR: In this article, the authors measured the cross-sections of D ∗± mesons in two-photon collisions at L3 at a centre-of-mass energy s =189 GeV with an integrated luminosity of 176.4 pb −1.
TL;DR: In this article, the authors measured the forward-backward charge asymmetry in the process of the time-integrated mixing parameter in the L3 experiment and measured the pole asymmetry at energies away from the pole energy with a mean center-of-mass energy of 91.26 GeV.
TL;DR: In this article, a search for chargino and neutralino pair production in collisions at center-of-mass energies between 161~\textrm{Ge\kern -0.1em V} and 183~ ε ≥ 0.1m V was performed under the assumptions that R-parity is not conserved and that only purely leptonic or hadronic R parity violating decays are allowed.
TL;DR: In this paper, a search for scalar leptons in e+e−collisions at 183 GeV center-of-mass energy at LEP was conducted, and no evidence for such particles was found in a data sample of 55.2 pb−1.
01 Aug 1999
TL;DR: In this paper, the KLOE detector, mainly designed to measure the R ( ϵ′ ϵ ) parameter of CP violation in KL decay to an absolute precision of ≈ 10−4, is completed and will start data taking by spring 1999 at the e+ e− Φ-factory DAΦNE.
Abstract: The KLOE detector, mainly designed to measure the R ( ϵ′ ϵ ) parameter of CP violation in KL decay to an absolute precision of ≈ 10−4, is completed and will start data taking by spring 1999 at the e+ e− Φ-factory DAΦNE in Frascati. The primary K-meson physics and the experimental requirements at DAΦNE are summarized. The design strategies, the salient features and the main physics performances of all components of the experimental apparatus are reviewed.