L3 results for 1999 summer conferences

Status July 13
Number PL/PA Session Abstract Paper Plots

Preliminary results on 1999 data

1_232 1,6 1,6 Preliminary Standard Model Measurements at $\sqrt{s}=192$ and 196 GeV by the L3 Experiment *L3 note 2440 Figures: 1, 2, 3, 4, 5, 6a, 6b, 7, 8a, 8b, 9, 10, 11a, 11b, 11c, 11d
7_233 7, 8 7 Preliminary Results on New Particle Searches at $\sqrt{s}$ = 192 - 196 GeV *L3 note 2444 Figures: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12

Searches for Higgs bosons

7_234 7, 8 7 Search for the Standard Model Higgs Boson in $e^+e^-$ Interactions at $\sqrt{s}=189$ GeV *L3 paper 178 figures: 1, 2, 3, 4, 5.
7_235 7, 8 7 Search for Neutral Higgs Bosons of the Minimal Supersymmetric Standard Model in $e^+e^-$ Interactions at $\sqrt{s}$ = 189 GeV *L3 note 2438 figures: 1, 2, 3, 4, 5a, 5b, 6, 7
7_236 7, 8 7 Search for Charged Higgs Bosons in $e^+e^-$ Collisions at a Centre-of-Mass Energy of 189 GeV *L3 note 2379 Figures: 1, 2a, 2b, 3, 4
7_237 7, 8 7 Missing mass spectra in leptonic and hadronic events from $\mathrm{e^+e^-}$ collisions at $\sqrt{s} =189$ GeV and limits on invisible Higgs decays *L3 note 2435 Figures: 1a, 1b, 2a, 2b, 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b, 9a, 9b, 10a, 10b, 11a, 11b, 11c, 12a, 12b, 12c, 12d, 13a, 13b, 14a, 14b, 15, 16a, 16b, 17, 18, 19
7_238 7, 8 7 Search for Higgs Boson Decaying into Two Photons in $\mathrm{e^+e^-}$ Interactions at $\sqrt{s} =189$ GeV *L3 note 2429 Figures: 1, 2a, 2b, 3a, 3b, 3c, 4, 5, 6, 7
. . . Search for non-standard Higgs production and anomalous couplings through the $\mathrm{e^+e^-} \rightarrow H \gamma$ process at LEP *L3 note 2430 Figures: 1, 2, 3, 4, 5, 6, 7a, 7b, 7c, 7d, 8, 9

Searches for SUSY particles

7_239 7,8 7 Search for Scalar Leptons, Charginos and Neutralinos in $e^+e^-$ Collisions at $\sqrt{s} = 189$ GeV *L3 note 2396 Figures: 1a, 1b, 2a, 2b, 2c, 2d, 2e, 2f, 3a, 3b, 3c, 3d, 3e, 3f, 4a, 4b, 4c, 5, 6, 7, 8, 9a, 9b, 9c, 10, 11, 12, 13, 14, 15, 16, 17
7_240 7,8,11 7,10 Search for Radiative Pair Production of Charginos with masses close to LSP mass. *L3 note 2431 Figures: 1, 2, 3, 4 , 5 , 6 , 7 , 8, 9, 10 ,
6_241 6,7,8 6,7 Single and Multi-Photons Events with Missing Energy in $e^+e^-$ Collisions at $\sqrt{s} = 189$ GeV *L3 note 2426 Figures: 1a, 1b, 2a, 2b, 3 , 4 , 5 , 6 , 7a, 7b, 8, 9a , 9b , 10a, 10b
7_242 7,8 7 Searches for Scalar Top and Scalar Bottom Quarks in $e^+e^-$ Interactions at $\sqrt{s} = 189 GeV$ *L3 note 2419 Figures: 1, 2, 3a, 3b, 4a, 4b, 5a, 5b, 6a, 6b, 7a, 7b, 8a, 8b
7_244 7,8 7 Search for R-parity Violating Chargino, Neutralino and Scalar Top Decays in $e^+e^-$ Collisions at $\sqrt{s} = 189$ GeV *L3 note 2410 Figures: 1, 2, 3, 4, 5, 6a, 6b, 6c, 7, 8,
7_243 7,8 7 Searches for Scalar leptons in GMSB Models in $\mathrm{e^+e^-}$ Collisions at $\sqrt{s}$ = 189 GeV. *L3 note 2433 Figures: 1, 2, 3, 4, 5a, 5b, 6a, 6b, 6c, 7, 7a, 7b, 7c, 8, 8a, 8b, 8c

Searches for exotica and new physics

7_245 7,8 7 Search for Heavy Neutral and Charged Leptons in $e^+ e^-$ Annihilation at $\sqrt{s}$ = 183 and 189 GeV *L3 paper 177 figures: 1, 2, 3, 4
7_246 7,8 7 Search for Heavy Isosinglet Neutrinos in $e^+ e^-$ Annihilation at 130 < $\sqrt{s}$ < 189 GeV *L3 paper 179 figures: 1, 2, 3, 4, 5,
7_247 7,8 7 Search for Excited Leptons at $\sqrt{s}$ = 189 GeV *L3 note 2409 figures: 1, 2, 3, 4, 5, 6, 7
7_248 7,8 7 Search for Technicolour production at LEP *L3 note 2428 figures: 1, 2, 3, 4
7_252 7,8 7 Search for Quantum Gravity and Extra Dimensions Effects in $e^+e^-$ Interactions *L3 note 2418 figures: 1, 2a, 2b, 2c, 2d, 3, 4, 5

ZZ Physics

7_249 6,7 6,7 ZZ Production in $e^+e^-$ Interactions at $\sqrt{s} = 189$ GeV *L3 note 2413 figures: 1, 2a, 2b, 2c, 2d, 3, 4, 5a, 5b, 5c, 5d,
6_250 6,7 6,7 Study of anomalous ZZ$\gamma$ and Z$\gamma\gamma$ couplings at LEP *L3 note 2412 figures: 1, 2, 3, 4, 5, 6, 7a, 7b, 8a, 8b
6_251 6,7 6,7 Hard-photon Production at $\sqrt{s} = 189$ GeV *L3 note 2411 figures: 1, 2, 3, 4

W Physics

6_253 6 6 Preliminary Results on the Measurement of W-Pair Cross Sections in $e^+e^-$ Interactions at $\sqrt{s} = 189$ GeV and W-Decay Branching Fractions *L3 note 2376 figures 1a, 1b, 2a, 2b, 3a, 3b, 4a, 4b, 5a, 5b, 5c, 5d, 6, 7
6_255 6 6 Preliminary Results on the Measurement of Mass and Width of the W Boson at LEP *L3 note 2377 figures 1a, 1b, 1c, 1d, 2a, 2b, 3, 4, 5,
6_254 6 6 Preliminary Results on the Measurement of Triple-Gauge-Boson Couplings of the W Boson at LEP *L3 note 2378 figures 1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d, 3a, 3b, 3c, 4a, 4b, 4c, 5a, 5b, 5c,
6_256 6 6 Preliminary Results on Single W Boson Production at $\sqrt{s} = 189$ GeV *L3 note 2367 figures 1, 2, 3, 4, 5, 6
3_257 3,6 3,6 Study of Bose-Einstein Correlations in W-Pair Production at LEP *L3 note 2405 figures: 1, 2, 3, 4, 5
1_258 1,3,6 1,3,6 Colour Reconnection Studies in $e^+e^- \rightarrow W^+W^-$ events at $\sqrt{s} = 189$ GeV *L3 note 2406 figures: 1, 2, 3, 4a, 4b, 5a, 5b, 5c, 5d, 6a, 6b, 7a, 7b, 8, 9, 10a, 10b, 10c, 10d
. . . Direct Observation of Longitudinally Polarised W$^{\pm}$ Bosons *L3 note 2441 figures: 1, 2, 3, 4, 5

Lineshape / Fermion-pair production

6_259 6 6 Precise Determination of Z Parameters *L3 note 2436 figures: 1, 2, 3, 4, 5, 6, 7
6_260 6 6 Measurement of the Effective Weak Mixing Angle by Jet-Charge Asymmetry in Hadronic Decays of the Z Boson *L3 paper 157 figures: 1, 2, 3a, 3b, 4
6_262 6 6 Measurement of Hadron and Lepton-Pair Production above the Z Resonance *L3 note 2398 figures: 1, 2, 3a, 3b, 3c, 3d, 4, 5, 6, 7, 8, 9, 10, 11,
6_261 6,7,8 6,7 Search for Extra Z Bosons in Fermion-Pair Production at LEP *L3 note 2425 figures: 1a, 1b, 2a, 2b, 3
6_264 6,7,8 6,7 Search for R-parity Breaking Scalar Neutrino Exchange at LEP *L3 note 2399 figures: 1, 2a, 2b, 3, 4, 5
6_263 6,7,8 6,7 Search for New Physics Phenomena in Fermion-Pair Production at LEP *L3 note 2402 figures: 1a, 1b1, 1b2, 1c1, 1c2, 2a, 2b, 2c, 2d, 3a, 3b, 3c, 3d, 4, 5
6_266 6 6 Measurement of Quasi-Real Compton Scattering *L3 note 2401 figures: 1a, 1b, 2a, 2b, 3, 4a, 4b, 5

Two-photon physics

1_265 1,2,3,5 1,3,5 Measurement of Charm and Beauty Production in $\gamma \gamma$ Collisions at LEP *L3 note 2421 Figures: 1, 2, 3, 4a, 4b, 5a, 5b, 6, 7a, 7b, 8, 9
3_267 3,5 3,5,8 $\chi_{{\rm c}2}$ Formation in Two-Photon Collisions at LEP *L3 paper 165 Figures: 1, 2, 3
3_268 3,5 3,5,8 Formation of the $\eta_{c}$ in Two-Photon Collisions at LEP *L3 paper 176 Figures: 1, 2, 3, 4, 5
3_270 1,2,3 1,2,3 Total cross section and hadron production in $\gamma\gamma$ collisions at LEP *L3 note 2400 Figures: 1a, 1b, 1c, 1d, 2a, 2b, 2c, 2d, 3a, 3b, 3c, 3d, 4a, 4b, 4c, 4d, 5a, 5b, 5c, 5d, 6a, 6b, 6c, 6d, 7a, 7b, 7d
3_269 3 3,8 The K$^0_s$K$^0_s$ and the K$^0_s$K$^\pm\pi^\mp$ Final States in Two-Photon Collisions at LEP and Glueball Searches *L3 note 2427 Figures: 1, 2, 3, 4, 5, 6, 7, 8, 9
2_271 2 2 Study of the Hadronic Photon Structure Function $F^\gamma_2$ at LEP *L3 paper 149 figures: 1, 2, 3, 4, 5, 6, 7
2_272 2 2 The $Q^2$ evolution of the Hadronic Photon Structure Function $F^\gamma_2$ at LEP *L3 paper 164 figures: 1, 2, 3, 4
2_273 2 2 Measurement of the Photon Structure Function at High-Q$^2$ at LEP *L3 note 2403 figures: 1, 2, 3, 4, 5, 6, 7, 8
1_274 1,2,3 1,2,3 Study of Double Tag Events in Two Photon Collisions at LEP *L3 note 2404 figures: 1, 2a, 2b, 3a, 3b, 4, 5
1_275 1,2,3,5 1,3,5 Measurement of $\mathrm{D^\ast}$ Production in in Two-Photon Collisions at LEP2 *L3 note 2437 figures: 1a, 1b, 2, 3a, 3b, 4a, 4b 5, 6,

QCD and hadron physics

1_279 1,6 1,6 QCD Studies and Determination of $\alpha_s$ using Hadronic Event Structures from 30 GeV to 189 GeV *L3 note 2414 figures: 1a, 1b, 2a, 2b, 3, 4, 5, 6, 7, 8, 9
5_278 5,6,7 5,6,7 Search for Flavor Changing Neutral Current at LEP *L3 note 2416 figures: 1a, 1b, 2a, 2b, 3, 4, 5
1_276 1,3 1,3 Moments of the charged-particle multiplicity distribution in Z Decays at LEP *L3 note 2407 figures: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10
3_277 3,6 3,6 Measurement of Bose-Einstein Correlations for Both Charged and Neutral Pions from Z Decays Not submitted figures:
3_280 3 3 Measurement of an Elongation of the Pion Source in Z Decays *L3 paper 174 figures: 1, 2, 3, 4
1_281 1,5 1,5 Measurement of the Probability of Gluon Splitting into Charmed Quarks in Hadronic Z Decays L3 note 2415 figures: 1, 2, 3a, 3b, 3c, 3d, 4a, 4b, 4c, 5, 6a, 6b

Heavy Flavour

5_282 5,6 5,6 Measurement of $R_b$ and $\mathrm{Br}(\mathrm{b} \rightarrow \ell\nu\mathrm{X})$ at LEP Using Double-Tag Methods *L3 note 2420 figures: 1, 2, 3, 4, 5, 6, 7, 8
6_284 5,6 5,6 Measurement of the $\mathrm{e^+e^-} \rightarrow \mathrm{Z}\rightarrow \mathrm{b\bar{b}}$ Forward-Backward Asymmetry and the $\mathrm{B_0\bar{B}_0}$ Mixing Parameter Using Prompt Leptons *L3 paper 163 figures: 1a, 1b, 1c, 1d, 2a, 2b, 3, 4
5_283 5,6 5,6 Measurements of $\mathrm{R_{b}}$ and $\mathrm{A_{FB}^{b}}$ at LEP2 with the L3 detector *L3 note 2417 figures: 1, 2a, 2b, 3a, 3b, 4a, 4b, 4c, 4d, 5a, 5b, 6
5_285 5 5,8 Measurement of the Spectroscopy of Orbitally Excited B Mesons at LEP *L3 note 2423 Figures: 1, 2, 3, 4
5_286 5 5 Heavy Quarkonium Production in $\mathrm{Z}$ Decays *L3 paper 167 figures: 1, 2a, 2b, 3, 4, 5a, 5b, 6, 7

Tau physics

6_287 6 6 Measurement of the Lifetime of the $\tau$ Lepton *L3 note 2424 figures: 1a, 1b, 2, 3, 4
6_288 6 6 Measurement of the Branching fractionsof the, $\tau$ decay into electrons and muons Not submitted figures: