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Journal articleAbbiendi G, Ackerstaff K, Alexander G, et al., 1999,
Search for Higgs bosons in e<SUP>+</SUP>e<SUP>-</SUP> collisions at 183 GeV
, EUROPEAN PHYSICAL JOURNAL C, Vol: 7, Pages: 407-435, ISSN: 1434-6044- Cite
- Citations: 73
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Journal articleAckerstaff K, Alexander G, Allison J, et al., 1999,
Measurements of flavour-dependent fragmentation functions in Z<SUP>0</SUP>→q(q)over-bar events
, EUROPEAN PHYSICAL JOURNAL C, Vol: 7, Pages: 369-381, ISSN: 1434-6044- Cite
- Citations: 74
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Journal articleBarate R, Buskulic D, Decamp D, et al., 1999,
Search for B<sub>s</sub><SUP>0</SUP> oscillations using inclusive lepton events
, EUROPEAN PHYSICAL JOURNAL C, Vol: 7, Pages: 553-569, ISSN: 1434-6044- Cite
- Citations: 30
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Journal articleBarate R, Buskulic D, Decamp D, et al., 1999,
Search for supersymmetry with a dominant R-parity violating <i>LQ(D)</i>over-bar coupling in e<SUP>+</SUP>e<SUP>-</SUP> collisions at centre-of-mass energies of 130 GeV to 172 GeV
, EUROPEAN PHYSICAL JOURNAL C, Vol: 7, Pages: 383-405, ISSN: 1434-6044- Cite
- Citations: 18
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Journal articleAbreu P, Adam W, Adye T, et al., 1999,
Search for lightest neutralino and stau pair production in light gravitino scenarios with stau NLSP
, EUROPEAN PHYSICAL JOURNAL C, Vol: 7, Pages: 595-607, ISSN: 1434-6044- Cite
- Citations: 7
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Journal articleAckerstaff K, Alexander G, Allison J, et al., 1999,
Measurement of the strong coupling constant α<sub>s</sub> and the vector and axial-vector spectral functions in hadronic tau decays
, EUROPEAN PHYSICAL JOURNAL C, Vol: 7, Pages: 571-593, ISSN: 1434-6044- Cite
- Citations: 349
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Journal articleAbreu P, Adam W, Adye T, et al., 1999,
Study of the four-jet anomaly observed at LEP centre-of-mass energies of 130 and 136 GeV
, PHYSICS LETTERS B, Vol: 448, Pages: 311-319, ISSN: 0370-2693- Cite
- Citations: 1
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Journal articleAcciarri M, Achard P, Adriani O, et al., 1999,
Measurement of the e<SUP>+</SUP>e<SUP>-</SUP>→Z→b(b)over-bar forward-backward asymmetry and the B<SUP>0</SUP>(B)over-bar<SUP>0</SUP> mixing parameter using prompt leptons
, PHYSICS LETTERS B, Vol: 448, Pages: 152-162, ISSN: 0370-2693- Cite
- Citations: 25
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Conference paperAlbergo S, Azzi P, Babucci E, et al., 1999,
Test results of heavily irradiated Si detectors
, 9th Symposium on Radiation Measurements and Applications, Publisher: ELSEVIER SCIENCE BV, Pages: 238-241, ISSN: 0168-9002 -
Journal articleBarate R, Buskulic D, Decamp D, et al., 1999,
Search for the standard model Higgs boson at the LEP2 collider near √<i>s</i>=183 GeV (vol 440, pg 403, 1998)
, PHYSICS LETTERS B, Vol: 447, Pages: 336-351, ISSN: 0370-2693- Cite
- Citations: 14
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Journal articleAbbiendi G, Ackerstaff K, Alexander G, et al., 1999,
Search for baryon and lepton number violating Z<SUP>0</SUP> decays
, PHYSICS LETTERS B, Vol: 447, Pages: 157-166, ISSN: 0370-2693- Cite
- Citations: 5
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Journal articleAbbiendi G, Ackerstaff K, Alexander G, et al., 1999,
A measurement of the τ<SUP>-</SUP>→e<SUP>-</SUP>(ν)over-bar<sub>e</sub>ν<sub>τ</sub> branching ratio
, PHYSICS LETTERS B, Vol: 447, Pages: 134-146, ISSN: 0370-2693- Cite
- Citations: 20
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Journal articleBarate R, Buskulic D, Decamp D, et al., 1999,
Analysis of transverse momentum correlations in hadronic Z decays
, PHYSICS LETTERS B, Vol: 447, Pages: 183-198, ISSN: 0370-2693 -
Journal articleAcciarri M, Achard P, Adriani O, et al., 1999,
The <i>Q</i><SUP>2</SUP> evolution of the hadronic photon structure function <i>F</i><sub>2</sub><SUP>γ</SUP> at LEP
, PHYSICS LETTERS B, Vol: 447, Pages: 147-156, ISSN: 0370-2693- Author Web Link
- Cite
- Citations: 50
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Journal articleAcciarri M, Adriani O, Aguilar-Benitez M, et al., 1999,
Search for charged Higgs bosons in e<SUP>+</SUP>e<SUP>-</SUP> collisions at centre-of-mass energies between 130 and 183 GeV
, PHYSICS LETTERS B, Vol: 446, Pages: 368-377, ISSN: 0370-2693- Author Web Link
- Cite
- Citations: 9
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Journal articleAbreu P, Adam W, Adye T, et al., 1999,
Search for Leptoquarks and FCNC in <i>e</i><i><SUP>+</SUP></i><SUP>e</SUP><SUP>-</SUP> annihilations √<i>s</i> = 183 GeV
, PHYSICS LETTERS B, Vol: 446, Pages: 62-74, ISSN: 0370-2693- Author Web Link
- Cite
- Citations: 41
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Journal articleAbreu P, Adam W, Adye T, et al., 1999,
Search for charginos, neutralinos and gravitinos in e<SUP>+</SUP>e<SUP>-</SUP> interactions at √<i>s</i> = 183 GeV
, PHYSICS LETTERS B, Vol: 446, Pages: 75-91, ISSN: 0370-2693- Author Web Link
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- Citations: 24
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Journal articleAcciarri M, Adriani O, Aguilar-Benitez M, et al., 1999,
Searches for scalar top and scalar bottom quarks in e<SUP>+</SUP>e<SUP>-</SUP> interactions at 161GeV≤√<i>s</i>≤183GeV
, PHYSICS LETTERS B, Vol: 445, Pages: 428-438, ISSN: 0370-2693- Cite
- Citations: 12
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Journal articleAcciarri M, Adriani O, Aguilar-Benitez M, et al., 1999,
Searches for scalar top and scalar bottom quarks in e+e- interactions at 161 GeV ≤ √s ≤ 183 GeV
, Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Vol: 445, Pages: 428-438, ISSN: 0370-2693Searches for scalar top and scalar bottom quarks have been performed at center-of-mass energies between 161 GeV and 183 GeV using the L3 detector at LEP. No signal is observed. Model-independent limits on production cross sections are determined for the two decay channels t̃<inf>1</inf> → cχ̃<sup>0</sup> <inf>1</inf> and b̃<inf>1</inf> → b χ̃<sup>0</sup> <inf>1</inf>. Within the framework of the Minimal Supersymmetric extension of the Standard Model mass limits are derived. For mass differences between t̃<inf>1</inf> and χ̃<sup>0</sup> <inf>1</inf> greater than 10 GeV a 95% C.L. limit of 81.5 GeV is set on the mass of the Supersymmetric partner of the left-handed top. A supersymmetric partner of the left-handed bottom with a mass below 80 GeV is excluded at 95% C.L. if the mass difference between b̃<inf>1</inf> and χ̃<inf>1</inf> is greater than 20 GeV. © 1999 Published by Elsevier Science B.V. All rights reserved.
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Journal articleAndrés E, Askebjer P, Barwick SW, et al., 1999,
Status of the AMANDA experiment
, Nuclear Physics B Proceedings Supplements, Vol: 70, Pages: 448-452, ISSN: 0920-5632The AMANDA high energy neutrino telescope has successfully been increased in size from four detector strings to ten detector strings during the 1996/1997 season. The first upward going muon-neutrino candidates have been reconstructed from the 1996 year's four-string data. Three new detector strings will be deployed during 1997/1998 to 2350 metres depth.
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Journal articleFortunato E, Becker U, Dinner R, et al., 1999,
Systematic study of electron drift for gaseous chamber design
, IEEE Nuclear Science Symposium and Medical Imaging Conference, Vol: 1, Pages: 106-110We present a consistent set of measurements of electron drift velocities and Lorentz deflection angles in all noble gases with methane and ethane as quenchers in magnetic fields up to 0.8 Tesla. These and many other results are available in a searchable database on World Wide Web at http: //cyclotron.mit.edu/drift/ to allow for guided design and optimization of future detectors. A simple model is used to form an empirical parameterization of the results. This compact form unifies the drift characteristics of a gas mixture over a range of electric (0 - 1.5 kV/cm) and magnetic (0-0.8 Tesla) fields. A more detailed model is presented which explains the surprisingly large effect of even modest (and inevitable) nitrogen contamination on electron drift velocity. Additional measurements and simulations confirm the validity of the model's predictions and show possible applications.
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Journal articleBarate R, Decamp D, Ghez P, et al., 1999,
A direct measurement of
, Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Vol: 465, Pages: 349-362, ISSN: 0370-2693The inclusive charm production rate in W decays is measured from a study of the properties of final state particles. The sample of W pairs is selected from 67.7 pb<sup>-1</sup>collected by ALEPH in 1996 and 1997 at centre-of-mass energies near 172 and 183 GeV in the channels W<sup>+</sup>W<sup>-</sup>→ 4q and W<sup>+</sup>W<sup>-</sup>→ℓvqq̄. The branching fraction of hadronic W decays to a final state containing a c quark, R<inf>c</inf> <sup>W</sup>= Γ(W→cX)/Γ(W→hadrons), is measured to be 0.51 ± 0.05<inf>stat</inf>+ 0.03<inf>syst.</inf>This allows a direct determination of the CKM matrix element |Vcs| = 1.00 ± 0.11<inf>stat</inf>± 0.07<inf>syst</inf>. © 1999 Published by Elsevier Science B.V. All rights reserved.
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Journal articleAcciarri M, Achard P, Adriani O, et al., 1999,
The Q2 evolution of the hadronic photon structure function F2 γ at LEP
, Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Vol: 447, Pages: 147-156, ISSN: 0370-2693New measurements at a centre-of-mass energy √s ≃ 183 GeV of the hadronic photon structure function F<inf>2</inf> <sup>γ</sup>(x) in the Q<sup>2</sup> interval, 9 GeV<sup>2</sup> ≤ Q<sup>2</sup> ≤ 30 GeV<sup>2</sup>, are presented. The data, collected in 1997 with the L3 detector, correspond to an integrated luminosity of 51.9 pb<sup>-1</sup>. Combining with the data taken at a centre-of-mass energy of 91 GeV, the evolution of F<inf>2</inf> <sup>γ</sup> with Q<sup>2</sup> is measured in the Q<sup>2</sup> range from 1.2 GeV<sup>2</sup> to 30 GeV<sup>2</sup>. F<inf>2</inf> <sup>γ</sup> shows a linear growth with InQ<sup>2</sup>; the value of the slope α<sup>-1</sup>dF<inf>2</inf> <sup>γ</sup>(Q2)/dlnQ<sup>2</sup> is measured in two x bins from 0.01 to 0.2 and is somewhat higher than predicted. © 1999 Published by Elsevier Science B.V. All rights reserved.
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Journal articleAcciarri M, Achard P, Adriani O, et al., 1999,
Search for low scale gravity effects in e+e- collisions at LEP
, Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Vol: 464, Pages: 135-144, ISSN: 0370-2693Recent theories propose that quantum gravity effects may be observable at LEP energies via gravitons that couple to Standard Model particles and propagate into extra spatial dimensions. The associated production of a graviton and a photon is searched for as well as the effects of virtual graviton exchange in the processes: e<sup>+</sup>e<sup>-</sup>→ γγ, W<sup>+</sup>W<sup>-</sup>, μ<sup>+</sup>μ<sup>-</sup>, τ<sup>+</sup>τ<sup>-</sup>, qq and e<sup>+</sup>e<sup>-</sup>. No evidence for this new interaction is found in the data sample collected by the L3 detector at LEP at centre-of-mass energies up to 183 GeV. Limits close to 1 TeV on the scale of this new scenario of quantum gravity are set. © 1999 Published by Elsevier Science B.V. All rights reserved.
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Journal articleAcciarri M, Achard P, Adriani O, et al., 1999,
Search for the standard model Higgs boson in e+e- interactions at √S = 189 GeV
, Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Vol: 461, Pages: 376-386, ISSN: 0370-2693A search for the Standard Model Higgs boson is carried out on 176.4pb<sup>-1</sup> of data collected by the L3 detector at a center-of-mass energy of 189 GeV. The data are consistent with the expectations of Standard Model processes and no evidence of a Higgs signal is observed. Combining the results of this search with those at lower center-of-mass energies, a lower limit on the mass of the Standard Model Higgs boson of 95.3 GeV is set at the 95% confidence level. © 1999 Elsevier Science B.V. All rights reserved.
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Journal articleAcciarri M, Achard P, Adriani O, et al., 1999,
Search for heavy isosinglet neutrinos in e+e- annihilation at 130 < √s < 189 GeV
, Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Vol: 461, Pages: 397-404, ISSN: 0370-2693A search for heavy neutrinos that are isosinglets under the standard SU(2)L gauge group is made at center-of-mass energies 130 < √s < 189 GeV with the L3 detector at LEP. Such heavy neutrinos are expected in many extensions of the Standard Model. The search is performed for the first generation heavy singlet neutrino, Ne, through the decay mode N<inf>e</inf> → e + W. We set upper limits on the mixing parameter between the heavy and light neutrino for the heavy neutrino mass range from 80 GeV to 185 GeV. © 1999 Elsevier Science B.V. All rights reserved.
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Journal articleAcciarri M, Achard P, Adriani O, et al., 1999,
Search for charged Higgs bosons in e+ e- collisions at √s = 189 GeV
, Physics Letters Section B Nuclear Elementary Particle and High Energy Physics, Vol: 466, Pages: 71-78, ISSN: 0370-2693A search for pair-produced charged Higgs bosons is 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<sup>-1</sup>. Higgs decays into a charm and a strange quark or into a tau lepton and its associated neutrino are considered. The observed events are consistent with the expectations from Standard Model background processes. A lower limit of 65.5 GeV on the charged Higgs mass is derived at 95% confidence leva, independent of the decay branching ratio Br(H ± → τν). ©1999 Published by Elsevier Science B.V. All rights reserved.
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Conference paperI Liubarsky et al, 1999,
DARK MATTER SEARCH AT BOULBY MINE
, Dark matter in astrophysics and particle physics, Pages: 780-784 -
Conference paperDavies G J, 1999,
RECENT RESULTS FROM PBWO4 CRYSTALS AND MSGCS IN CMS
, European Physical Society, 1997, Pages: 1109-1113 -
Journal articleAbbiendi G, Ackerstaff K, Alexander G, et al., 1999,
Bose-Einstein correlations in e+e- → W+W- at 172 and 183 GeV
, European Physical Journal C, Vol: 8, Pages: 559-571, ISSN: 1434-6044Bose-Einstein correlations between like-charge pions are studied in hadronic final states produced by e<sup>+</sup>e<sup>-</sup> annihilations at center-of-mass energies of 172 and 183 GeV. Three event samples are studied, each dominated by one of the processes W<sup>+</sup>W<sup>-</sup> →qq̄ℓν̄e, W<sup>+</sup>W<sup>-</sup> qq̄qq̄, or (Z<sup>0</sup>/γ)* → qq̄. After demonstrating the existence of Bose-Einstein correlations in W decays, an attempt is made to determine Bose-Einstein correlations for pions originating from the same W boson and from different W bosons, as well as for pions from (Z<sup>0</sup>/γ)* → qq̄ events. The following results are obtained for the individual chaoticity parameters λ, assuming a common source radius R: λ<sup>same</sup>= 0.63 ± 0.19 ± 0.14 λ<sup>diff</sup> = 0.22 ± 0.53 ±0.14, λ <sup>Z</sup>* = 0.47 ± 0.11 ± 0.08, R = 0.92 ± 0.09 ± 0.09 fm. In each case, the first error is statistical and the second is systematic. At the current level of statistical precision it is not established whether Bose-Einstein correlations, between pions from different W bosons exist or not.
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