Publications
294 results found
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Study of anomalous ZZγ and Zγγ couplings at LEP, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol: 436, Pages: 187-198, ISSN: 0370-2693
We search for anomalous ZZγ and Zγγ couplings with the L3 detector at LEP. The analysis is based on the study of the process e+ e+ → Zγ at center-of-mass energies in the range 161 GeV < √s < 183 GeV. No evidence for anomalous effects is found. Limits at the 95% confidence level are set on the values of the eight possible anomalous couplings. Depending on the type of coupling new physics scales below 213 GeV to 1083 GeV are excluded. © 1998 Elsevier Science B.V. All rights reserved.
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Measurement of the anomalous magnetic and electric dipole moments of the tau lepton, PHYSICS LETTERS B, Vol: 434, Pages: 169-179, ISSN: 0370-2693
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- Citations: 67
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Search for new physics phenomena in fermion-pair production at LEP, PHYSICS LETTERS B, Vol: 433, Pages: 163-175, ISSN: 0370-2693
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- Citations: 25
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Measurement of the B<SUP>0</SUP><sub>d</sub>-(B)over-bar<SUP>0</SUP><sub>d</sub> oscillation frequency, EUROPEAN PHYSICAL JOURNAL C, Vol: 5, Pages: 195-203, ISSN: 1434-6044
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- Citations: 22
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Search for the standard model Higgs boson in e<SUP>+</SUP>e<SUP>-</SUP> interactions at √s=183GeV, PHYSICS LETTERS B, Vol: 431, Pages: 437-450, ISSN: 0370-2693
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- Citations: 20
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Determination of the number of light neutrino species from single photon production at LEP, PHYSICS LETTERS B, Vol: 431, Pages: 199-208, ISSN: 0370-2693
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- Citations: 32
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Measurement of τ polarisation at LEP, PHYSICS LETTERS B, Vol: 429, Pages: 387-398, ISSN: 0370-2693
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- Citations: 24
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Local multiplicity fluctuations in hadronic Z decay, PHYSICS LETTERS B, Vol: 429, Pages: 375-386, ISSN: 0370-2693
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- Citations: 10
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Search for scalar leptons, charginos and neutralinos in e<SUP>+</SUP>e<SUP>-</SUP> collisions at √s=161-172 GeV, EUROPEAN PHYSICAL JOURNAL C, Vol: 4, Pages: 207-219, ISSN: 1434-6044
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- Citations: 23
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Angular multiplicity fluctuations in hadronic Z decays and comparison to QCD models and analytical calculations, PHYSICS LETTERS B, Vol: 428, Pages: 186-196, ISSN: 0370-2693
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- Citations: 16
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, K<SUP>0</SUP><sub>s</sub> and Λ production in quark and gluon jets at LEP (vol 407, pg 407, 1997), PHYSICS LETTERS B, Vol: 427, Pages: 409-412, ISSN: 0370-2693
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- Citations: 2
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Measurement of the weak dipole moments of the τ lepton, PHYSICS LETTERS B, Vol: 426, Pages: 207-216, ISSN: 0370-2693
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- Citations: 23
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Measurement of η′(958) formation in two-photon collisions at LEP1, PHYSICS LETTERS B, Vol: 418, Pages: 399-410, ISSN: 0370-2693
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- Citations: 94
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Missing mass spectra in hadronic events from e<SUP>+</SUP>e<SUP>-</SUP> collisions at √s=161-172GeV and limits on invisible Higgs decays, PHYSICS LETTERS B, Vol: 418, Pages: 389-398, ISSN: 0370-2693
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- Citations: 8
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Measurement of the B<sup>0</sup><inf>d</inf> - B̄<sup>0</sup><inf>d</inf> oscillation frequency, European Physical Journal C, Vol: 5, Pages: 195-203, ISSN: 1434-6044
Time-dependent B0-B̄0 mixing is studied using about two million hadronic Z decays registered by L3 in 1994 and 1995. For this study three techniques are used. Tagging of the b-quark charge at decay time is performed by identifying leptons from semileptonic B decays. The flavour of the b quark at production time is determined from the charge of the lepton in the opposite hemisphere or by using a jet-charge technique. The proper time of the B-particle decay is obtained by reconstructing the production and decay vertices or by a measurement of the lepton impact parameter. The combined result for the frequency of B0d meson oscillations is Δmd = 0.444 ± 0.040 ps-1.
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1998, Measurement of the average lifetime of b-hadrons in Z decays, PHYSICS LETTERS B, Vol: 416, Pages: 220-232, ISSN: 0370-2693
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- Citations: 11
Fisher PH, Uchida Y, 1998, Measurement of the invisible W width, Journal of High Energy Physics, Pages: 019-019, ISSN: 1126-6708
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1997, Single and multi-photon events with missing energy in e<SUP>+</SUP>e<SUP>-</SUP> collisions at 161 GeV<√s<172 GeV, PHYSICS LETTERS B, Vol: 415, Pages: 299-310, ISSN: 0370-2693
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- Citations: 30
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1997, Search for R-parity breaking sneutrino exchange at LEP, PHYSICS LETTERS B, Vol: 414, Pages: 373-381, ISSN: 0370-2693
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- Citations: 17
Acciarri M, Adriani O, AguilarBenitez M, et al., 1997, Upsilon production in Z decays, PHYSICS LETTERS B, Vol: 413, Pages: 167-175, ISSN: 0370-2693
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- Citations: 2
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1997, Neutral-current four-fermion production in e<sup>+</sup>e<sup>-</sup> interactions at 130 GeV ≤ √s ≤ 172 GeV: L3 Collaboration, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol: 413, Pages: 191-200, ISSN: 0370-2693
A study of neutral-current four-fermion processes is performed, using data collected by the L3 detector at LEP during high-energy runs at centre-of-mass energies 130-136, 161 and 170-172 GeV, with integrated luminosities of 4.9, 10.7 and 10.1 pb-1, respectively. The total cross sections for the final states ℓℓℓ'ℓ' and ℓℓqq (ℓ, ℓ' = e, μ or τ) are measured and found to be in agreement with the Standard Model prediction. © 1997 Elsevier Science B.V.
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1997, Upsilon production in Z decays: L3 collaboration, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol: 413, Pages: 167-175, ISSN: 0370-2693
We have searched for evidence of T production in 3.5 million hadronic Z decays collected by the L3 detector at LEP in 1991-1995. No signals are observed for the decay chain Z → ΥX; T → ℓ+ℓ- (ℓ= e,μ), therefore upper limits at the 95% confidence level are set on the following Z branching fractions: Br(Z → Υ(1S)X) < 5.5 × 10-5; Br(Z → Υ(2S)X) < 13.9 × 10-5; Br(Z → Υ(3S)X) < 9.4 × 10-5. Published by Elsevier Science B.V.
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1997, Hard-photon production at √s = 161 and 172 GeV at LEP L3 collaboration, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol: 413, Pages: 159-166, ISSN: 0370-2693
We have studied the process e+e- → nγ (n ≥ 2) at centre-of-mass energies of 161.3 GeV and 172.1 GeV. The analysis is based on a sample of events collected by the L3 detector in 1996 corresponding to total integrated luminosities of 10.7 pb-1 and 10.1 pb-1 respectively. The observed rates of events with two and more photons and the characteristic distributions are in good agreement with the Standard Model expectations. This is used to set lower limits on contact interaction energy scale parameters, on the QED cut-off parameters and on the mass of excited electrons. © 1997 Elsevier Science B.V.
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1997, Resonance formation in the π<sup>+</sup>π<sup>-</sup>π<sup>0</sup> final state in two-photon collisions, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol: 413, Pages: 147-158, ISSN: 0370-2693
A study of resonance formation is presented in the π+π-π0 final state in two-photon collisions at LEP. The a2(1320) radiative width is measured to be Γγγ = 0.98 ± 0.05 ± 0.09 keV. The helicity 2 production is dominant. Exclusive π+π-π0 production has also been studied in the mass region above the a2 in the ρπ and f2π channels. This region is dominated by a JP = 2+ helicity 2 wave. © 1997 Elsevier Science B.V.
Acciarri M, Adriani O, AguilarBenitez M, et al., 1997, Resonance formation in the pi(+) pi(-) pi(0) final state in two-photon collisions, PHYSICS LETTERS B, Vol: 413, Pages: 147-158, ISSN: 0370-2693
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- Citations: 35
Acciarri M, Adriani O, AguilarBenitez M, et al., 1997, Measurements of mass, width and gauge couplings of the W boson at LEP, PHYSICS LETTERS B, Vol: 413, Pages: 176-190, ISSN: 0370-2693
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- Citations: 43
Acciarri M, Adriani O, AguilarBenitez M, et al., 1997, Hard-photon production at root s=161 and 172 GeV at LEP, PHYSICS LETTERS B, Vol: 413, Pages: 159-166, ISSN: 0370-2693
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- Citations: 14
Acciarri M, Adriani O, AguilarBenitez M, et al., 1997, Neutral-current four-fermion production in e(+)e(-) interactions at 130 GeV<=root s<=172 GeV, PHYSICS LETTERS B, Vol: 413, Pages: 191-200, ISSN: 0370-2693
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- Citations: 3
Acciarri M, Adriani O, Aguilar-Benitez M, et al., 1997, Search for heavy neutral and charged leptons in e<sup>+</sup>e<sup>-</sup> annihilation at √s = 161 and √s = 172 GeV, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol: 412, Pages: 189-200, ISSN: 0370-2693
A search for unstable neutral and charged heavy leptons as well as for stable charged heavy leptons has been made at center-of-mass energies √s = 161 GeV and √s = 172 GeV with the L3 detector at LEP. No evidence for their existence was found. We exclude unstable neutral leptons of Dirac (Majorana) type for masses below 78.0 (66.7), 78.0 (66.7) and 72.2 (58.2) GeV, if the heavy neutrino couples to the electron, muon or tau family, respectively. We exclude unstable charged heavy leptons for masses below 81.0 GeV for a wide mass range of the associated neutral heavy lepton. The production of stable charged heavy leptons with a mass less than 84.2 GeV is also excluded. If the unstable charged heavy lepton decays via mixing into a massless neutrino, we exclude masses below 78.7 GeV. © 1997 Elsevier Science B.V.
Acciarri M, Adriani O, AguilarBenitez M, et al., 1997, Search for heavy neutral and charged leptons in e(+)e(-) annihilation at root s=161 and root s=172 GeV, PHYSICS LETTERS B, Vol: 412, Pages: 189-200, ISSN: 0370-2693
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- Citations: 10
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