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Performance of the CMS ECAL safety system for Super Modules SM0 and SM1
(2005)Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentJournal Article -
A new concept of monolithic silicon pixel detectors
(2004)Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated EquipmentJournal Article -
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A measurement of the gluon splitting rate into c(c)over-bar pairs in hadronic Z decays
(2003)Physics Letters BThe rate of gluon splitting into c ̄c pairs in hadronic Z decays is measured using the data sample collected by ALEPH from 1991 to 1995. The selection is based on the identification of leptons (electrons and muons) originating from semileptonic charm decays, and on the topological properties of signal events. The result derived from the selected sample is gc ̄c = (3.26 ± 0.23(stat) ± 0.42(syst))%.Journal Article -
Search for Higgs bosons decaying to WW in e+e- collisions at LEP
(2007)The European Physical Journal CA search for Higgs bosons produced in association with a fermion pair, and decaying to WW, is performed with the data collected by the ALEPH detector at centre-of-mass energies ranging from 191 to 209 GeV. The data correspond to an integrated luminosity of 453.2 pb-1. Thirteen exclusive selections are developed according to the different final state topologies. No statistically significant evidence for a Higgs boson decaying into a WW ...Journal Article -
Fermion pair production in e+e- collisions at 189-209 GeV and constraints on physics beyond the standard model
(2007)The European Physical Journal CCross sections, angular distributions and forward-backward asymmetries are presented, of two-fermion events produced in e+e- collisions at centre-of-mass energies from 189 to 209 GeV at LEP, measured with the ALEPH detector. Results for e+e-, μ+μ-, τ+τ-, qq̄, bb̄ and cc̄ production are in agreement with the standard model predictions. Constraints are set on scenarios of new physics such as four-fermion contact interactions, leptoquarks, ...Journal Article -
Single- and multi-photon production in e(+) e(-) collisions at √s up to 209 GeV
(2003)The European Physical Journal CEvents containing only energetic photons are analysed in a sample of 628pb−1 of data recorded from e+e− collisions at centre-of-mass energies between 189 and 209 GeV by the ALEPH detector at LEP. The e+e−→νν¯γ(γ) and e+e−→γγ(γ) cross sections are measured and found to be in agreement with the standard model predictions. The number of light neutrino generations is determined to be Nν=2.86±0.09. Upper limits are derived on the cross sections ...Journal Article -
Search for supersymmetric particles with R-parity violating decays in e(+)e(-) collisions at root s up to 209 GeV
(2003)The European Physical Journal CSearches for the pair production of supersymmetric particles under the assumption that R-parity is violated via a single dominant \ensuremathLLE¯, \ensuremathLQD¯ or \ensuremathU¯D¯D¯ coupling are performed using the data collected by the ALEPH detector at LEP at centre-of-mass energies from 189 to 209GeV. The numbers of observed candidate events in the data are in agreement with the Standard Model expectation, and limits on the production ...Journal Article -
Measurement of the hadronic photon structure function F-2(gamma)(x,Q(2)) in two-photon collisions at LEP
(2003)The European Physical Journal CThe hadronic photon structure function Fγ2(x,Q2) is measured from data taken with the ALEPH detector at LEP. At centre-of-mass energies between s√=189GeV and 207GeV an integrated luminosity of 548.4pb−1 is analyzed in two ranges of Q2 with ⟨Q2⟩=17.3 GeV2 and 67.2 GeV2. Detector effects and acceptance are corrected for with a Tikhonov unfolding procedure. The results are compared to theoretical predictions and measurements from other experiments.Journal Article