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Journal articleAbreu P, Adam W, Adye T, et al., 1999,
Search for composite and exotic fermions at LEP 2
, EUROPEAN PHYSICAL JOURNAL C, Vol: 8, Pages: 41-58, ISSN: 1434-6044- Author Web Link
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- Citations: 39
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Journal articleAbbiendi G, Ackerstaff K, Alexander G, et al., 1999,
Search for anomalous photonic events with missing energy in e<SUP>+</SUP>e<SUP>-</SUP> collisions at √<i>s</i> = 130, 136 and 183 GeV
, EUROPEAN PHYSICAL JOURNAL C, Vol: 8, Pages: 23-40, ISSN: 1434-6044- Author Web Link
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- Citations: 39
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Journal articleAbbiendi G, Ackerstaff K, Alexander G, et al., 1999,
W<SUP>+</SUP>W<SUP>-</SUP> production and triple gauge boson couplings at LEP energies up to 183 GeV
, EUROPEAN PHYSICAL JOURNAL C, Vol: 8, Pages: 191-215, ISSN: 1434-6044- Author Web Link
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- Citations: 56
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Journal articleBarate R, Decamp D, Ghez P, et al., 1999,
Search for charged Higgs bosons in e<SUP>+</SUP>e<SUP>-</SUP> collisions at √<i>s</i>=181-184 GeV
, PHYSICS LETTERS B, Vol: 450, Pages: 467-478, ISSN: 0370-2693- Author Web Link
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- Citations: 6
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Journal articleBarate R, Decamp D, Ghez P, et al., 1999,
Search for invisible Higgs boson decays in e<SUP>+</SUP>e<SUP>-</SUP> collisions at centre-of-mass energies up to 184Gev
, PHYSICS LETTERS B, Vol: 450, Pages: 301-312, ISSN: 0370-2693- Author Web Link
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- Citations: 7
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Journal articleAcciarri M, Achard P, Adriani O, et al., 1999,
Study of neutral-current four-fermion and ZZ production in e<SUP>+</SUP>e<SUP>-</SUP> collisions at √<i>s</i>=183GeV
, PHYSICS LETTERS B, Vol: 450, Pages: 281-293, ISSN: 0370-2693- Author Web Link
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- Citations: 22
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Journal articleAbreu P, Abreu P, Adam W, et al., 1999,
The scale dependence of the hadron multiplicity in quark and gluon jets and a precise determination of C<sub>A</sub>/C<sub>F</sub>
, PHYSICS LETTERS B, Vol: 449, Pages: 383-400, ISSN: 0370-2693- Author Web Link
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- Citations: 59
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Journal articleAbreu P, Adam W, Adye T, et al., 1999,
Measurement of inclusive ρ<SUP>0</SUP>, f<sub>0</sub>(980), <i>f</i><sub>2</sub>(1270), K<sub>2</sub><SUP>*0</SUP>(1430) and f′<sub>2</sub>(1525) production in Z<SUP>0</SUP> decays
, PHYSICS LETTERS B, Vol: 449, Pages: 364-382, ISSN: 0370-2693- Author Web Link
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- Citations: 31
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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- Author Web Link
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- Citations: 72
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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- Author Web Link
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- Citations: 30
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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- Author Web Link
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- Citations: 66
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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- Author Web Link
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- Citations: 336
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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- Author Web Link
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- Citations: 7
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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- Author Web Link
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- Citations: 18
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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- Author Web Link
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- 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- Author Web Link
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- Citations: 21
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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- Author Web Link
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- Citations: 13
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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 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
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- Citations: 50
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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- Author Web Link
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- Citations: 4
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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- Author Web Link
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- 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, 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
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- 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
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- 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 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 t̃1 → cχ̃01 and b̃1 → b χ̃01. Within the framework of the Minimal Supersymmetric extension of the Standard Model mass limits are derived. For mass differences between t̃1 and χ̃01 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 b̃1 and χ̃1 is greater than 20 GeV. © 1999 Published by Elsevier Science B.V. All rights reserved.
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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- Author Web Link
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- Citations: 12
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Journal articleAbbiendi G, Ackerstaff K, Alexander G, et al., 1999,
A measurement of the product branching ratio f(b → Λ<inf>b</inf>) · BR(Λ<inf>b</inf> → ΛX) in Z<sup>0</sup> decays
, European Physical Journal C, Vol: 9, Pages: 1-9, ISSN: 1434-6044The product branching ratio, f(b → Λb) · BR(Λb → ΛX), where Λb denotes any weakly-decaying b-baryon, has been measured using the OPAL detector at LEP. Λb's are selected by the presence of energetic Λ particles in bottom events tagged by the presence of displaced secondary vertices. A fit to the momenta of the Λ particles separates signal from B meson and fragmentation backgrounds. The measured product branching ratio is f(b → Λb) · BR(Λb → ΛX) = (2.67) ± 0.38(stat)+0.67-0.60(sys))%. Combined with a previous OPAL measurement, one obtains f(b → Λb) · BR(Λb → ΛX) = (3.50) ± 0.32(stat) ± 0.35(sys))%.
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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> → qq̄ events
, European Physical Journal C, Vol: 7, Pages: 369-381, ISSN: 1434-6044Fragmentation functions for charged particles in Z0 → qq̄ events have been measured for bottom (b), charm (c) and light (uds) quarks as well as for all flavours together. The results are based on data recorded between 1990 and 1995 using the OPAL detector at LEP. Event samples with different flavour compositions were formed using reconstructed D*± mesons and secondary vertices. The ξP = ln(1/xp) distributions and the position of their maxima ξ0 are also presented separately for uds, c and b quark events. The fragmentation function for b quarks is significantly softer than for uds quarks.
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Journal articleAckerstaff K, Alexander G, Allison J, et al., 1999,
Production of K<sup>0</sup><inf>S</inf> and Λ in quark and gluon jets from Z<sup>0</sup> decay
, European Physical Journal C, Vol: 8, Pages: 241-254, ISSN: 1434-6044The production of K0S mesons and Λ baryons in quark and gluon jets has been investigated using two complementary techniques. In the first approach, which provides high statistical accuracy, jets were selected using different jet finding algorithms and ordered according to their energy. Production rates were determined taking into account the dependences of quark and gluon compositions as a function of jet energy as predicted by Monte Carlo models. Selecting three-jet events with the k⊥ (Durham) jet finder (Ycut = 0.005), the ratios of K0S and Λ production rates in gluon and quark jets relative to the mean charged particle multiplicity were found to be 1.10 ± 0.02 ± 0.02 and 1.41 ± 0.04 ± 0.04, respectively, where the first uncertainty is statistical and the second is systematic. In the second approach, a new method of identifying quark jets based on the collimation of energy flow around the jet axis is introduced and was used to anti-tag gluon jets in symmetric (Y-shaped) three-jet events. Using the cone jet finding algorithm with a cone size of 30°, the ratios of relative production rates in gluon and quark jets were determined to be 0.94 ± 0.07 ± 0.07 for K0S and 1.18 ± 0.10 ± 0.17 for Λ. The results of both analyses are compared to the predictions of Monte Carlo models.
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