Showing papers by "Laurent Duflot published in 1998"
TL;DR: In this article, the flavour changing neutral current decay b→sγ has been detected in hadronic Z decays collected by ALEPH at LEP, which is isolated in lifetime-tagged b b events by the presence of a hard photon associated with a system of high momentum and high rapidity hadrons.
258 citations
TL;DR: In this article, the ALEPH detector at LEP1 has been used for detailed studies of both perturbative and non-perturbative aspects of strong interactions to be carried out using hadronic Z and tau decays.
224 citations
TL;DR: In this paper, a sample of four million hadronic Z decays collected with the ALEPH detector at LEP are fully reconstructed and used to look for resonant structure in the Bπ system.
39 citations
TL;DR: In this paper, the production of final states involving one or more energetic photons from e+e− collisions is studied in a sample of 58.5 pb −1 of data recorded at a centre-of-mass energy of 183 GeV by the ALEPH detector at LEP.
31 citations
TL;DR: In this paper, the triple gauge-boson couplings, αWΦ, α W and αBΦ have been measured using 34 semileptonically and 54 hadronically decaying W+W− candidate events.
29 citations
TL;DR: In this article, the final states with charged kaons in three-prong τ decays are studied by exploiting the particle identification from the dE/dx measurement, based on a sample of about 1.6 × 105 detected τ pairs collected with the ALEPH detector between 1991 and 1995 around the Z peak.
Abstract: Final states with charged kaons in three-prong τ decays are studied by exploiting the particle identification from the dE/dx measurement. The results are based on a sample of about 1.6 × 105 detected τ pairs collected with the ALEPH detector between 1991 and 1995 around the Z peak. The following branching ratios have been measured: B(τ- → K−K+π−ντ) = (1.63 ± 0.21 ± 0.17) × 10−3, B(τ− → K−π+π−ντ) = (2.14 ± 0.37 ± 0.29) × 10−3, B(τ− → K−K+π−π0ντ) = (0.75 ± 0.29 ± 0.15) × 10−3, and B(τ− → K−π+π−π0ντ) = (0.61 ± 0.39 ± 0.18) × 10−3. The first two measurements are more precise than the current world averages, while the last two channels are investigated for the first time. The 95% C.L. upper limit on the branching ratio for the decay τ− → K−K+K−ντ is 0.19 × 10−3. A study of intermediate states occurring in the K−K+π−ντ and K−π+π−ντ decays is also presented.
28 citations
TL;DR: In this paper, the ALEPH experiment at LEP at center-of-mass energies around 183 GeV is analyzed to search for sleptons, the partners of leptons in supersymmetric theories.
24 citations
TL;DR: In this article, a measurement of the fraction of hadronic Z decays in which a gluon splits into a b b pair, g b b, is presented using data collected by ALEPH from 1992 to 1995.
24 citations
TL;DR: In this article, the ALEPH detector has been used to search for scalar top, scalar bottom and degenerate scalar quarks with data collected at LEP at s = 181-184 GeV.
22 citations
TL;DR: In this article, the authors used the ALEPH detector at LEP to perform searches for supersymmetric particles in channels with one or more photons and missing energy, and the results were in good agreement with predictions based on the Standard Model, and were used to set upper limits on the cross sections for anomalous photon production.
21 citations
TL;DR: The mass of the W boson was obtained from reconstructed invariant mass distributions in W-pair events in this paper, where the sample of W pairs was selected from 10.65~pb$^{-1}$ collected with the ALEPH detector at a mean centre-of-mass energy of 172.09 \GEV.
TL;DR: In this article, a study of events with photons and missing energy has been performed with the data sample obtained with the ALEPH detector at centre-of-mass energies from 161 to 184 GeV, corresponding to a total integrated luminosity of about 80 pb**-1.30
TL;DR: In this paper, a sample of four million hadronic Z events collected in ALEPH from 1991 to 1995, the decays D ∗+ → D 0 π s +, with D0 decaying to K−π+ or to K+π−, are studied.
TL;DR: In this paper, the data collected at center-of-mass energies ranging from 130 to 172 GeV by ALEPH at LEP, corresponding to an integrated luminosity of 27.5 pb−1, are analysed in a search for pair-produced charged Higgs bosons H±.
TL;DR: In this paper, the data collected by ALEPH at LEP at center-of-mass energies ranging from 181 to 184 GeV, corresponding to an integrated luminosity of 57 pb(-1), are analysed to search for pair-produced neutral Higgs bosons h and A, in the b (b) over bar b(b, over bar and tau(+)tau(-)b (b), over bar final states.
TL;DR: An improved measurement of the forward-backward asymmetry in Z → b b decays is presented, based on a sample of 4.1 million hadronic Z decays collected by ALEPH between 1991 and 1995 as discussed by the authors.
TL;DR: In this article, the four jet topology is analyzed in the ALEPH data taken between November 1995 and November 1997, at center-of-mass energies ranging from 130 to 184 GeV.