The genus Melanopopillia Lin, 1980 in Indochina (Coleoptera: Scarabaeidae: Rutelinae: Anomalini)

The genus Melanopopillia Lin, 1980 is recorded for Indochina and the adjacent area of Myanmar for the first time. The subgenus Stagonopertha subgen. n. is described for M. (S.) arlekino sp. n. (type species) and M. (S.) carinicollis (Ohaus, 1905), comb. n. from the Northern Vietnam, Laos and north-eastern Myanmar (Kachin State). The new synonymy is established: Melanopopillia (s. str.) dinghuensis Lin, 1980 = Callistethus buddahnus Miyake, 1989, syn. n. New records of M. dinghuensis from Laos (Khammouane) and southern part of Vietnam (Dalat) are reported. Diagnoses of new taxa. Stagonopertha subgen. n. differs from the nominotypical subgenus Melanopopillia by the absence of an impression at the base of the elytra, by the shape of the 7th punctate row on the elytra, by the presence of the thick dense pilosity on the pronotum, the propygidium, the pygidum and abdominal ventrites, and by the maculated pattern on the elytra. Melanopopillia (Stagonopertha) arlekino sp. n. differs from M. (S.) carinicollis by the absence of the callose areas along the male pronotal base, by the non-shortened 2nd punctate row on the elytra and by the shape of the aedeagus

Four new species of the genus Anomala Samouelle, 1819 (Coleoptera: Scarabaeidae: Rutelinae) from South-East Asia and a key to the species with the similar elytral sculpture

Four new species of the genus Anomala Samouelle, 1819 from the continental South-East Asia are described. Anomala paramychodes sp. n. from Laos, Myanmar and South China and A. sinifrater sp. n. from South China are externally indistinguishable from A. amychodes Ohaus, 1914 but differ from this species in the structure of the aedeagus. Anomala levilinea sp. n. from Northern Vietnam is also similar to the aforementioned species but besides the structure of the aedeagus it can be distinguished by the presence of the glabrous longitudinal stripe on the pronotal disc. Anomala triformis sp. n. from northern Myanmar, Laos and Northern Vietnam belongs to the spiloptera species-group and can be easily distinguished from other members of this group by the presence of the lateral plate-like expansions of the parameres. A key to species of Anomala of Vietnam, Laos and the neighbouring territories having the strongly costate and deeply sulcate elytra and the indistinct punctures in the punctate rows is presented. Differential diagnosis of A. paramychodes sp. n. The new species belongs to the members of Anomala having the strongly costate and deeply sulcate elytra with the points of the punctate rows inseparable from the puncturation of the interstices. Within this complex of species, the new species can be attributed to the amychodes species-group characterizing by the strongly carinate abdominal ventrites 1–4 and the characteristic aedeagus with the short deep semi-tube-shaped and strongly asymmetrical parameres. The new species is very similar to and externally inseparable from A. amychodes (Sa Pa and Tam Dao mountain areas in Northern Vietnam) and A. sinifrater sp. n. (South China), but can be easily distinguished from these species in the structure of the aedeagus. Besides, the new species differs from A. levilinea sp. n. (Northern Vietnam) by the absence of the impunctate longitudinal stripe on the pronotum, and from A. bidoupensis Prokofiev, 2015 (Dalat Highlands in Central Vietnam) by the absence of the setosity on the pronotum and elytra. Differential diagnosis of A. sinifrater sp. n. The new species is externally indistinguishable from A. amychodes and A. paramychodes sp. n., but differs from these species in the shape of the parameters. Differential diagnosis of A. levilinea sp. n. The new species belongs to the amychodes species-group but differs from the other members of the group by the presence of the glabrous longitudinal stripe on the pronotal disc (vs. absent in A. amychodes, A. bidoupensis, A. paramychodes sp. n. and A. sinifrater sp. n.) and by the shape of parameres. Differential diagnosis of Anomala triformis sp. n. The new species belongs to the members of Anomala having the strongly costate and deeply sulcate elytra with the points of the punctate rows inseparable from the puncturation of the interstices. Within this agglomeration of species, the new species can be attributed to the spiloptera species-group characterizing by the presence of the wide wrinkled membrane connecting the parameres dorso-basally. By external characters the new species is indistinguishable from A. spiloptera Burmeister, 1855 and A. recordata Zorn, Kobayashi et Wada, 2017. The new species is most similar to A. recordata и A. jeanvoinei Benderitter, 1929 by the strucrure of the aedeagus, but can be easily distinguished from these and other species of the group by the presence of the plate-like lateral expansions of the parameres. It further differs from A. jeanvoinei by the elytra strongly transversely striolate and by the presence of the transverse band on the elytra, at least in a form of a few small isolated spots

Measurement of the W+W-gamma Cross Section and Direct Limits on Anomalous Quartic Gauge Boson Couplings at LEP

The process e+e- -> W+W-gamma is analysed using the data collected with the L3 detector at LEP at a centre-of-mass energy of 188.6GeV, corresponding to an integrated luminosity of 176.8pb^-1. Based on a sample of 42 selected W+W- candidates containing an isolated hard photon, the W+W-gamma cross section, defined within phase-space cuts, is measured to be: sigma_WWgamma = 290 +/- 80 +/- 16 fb, consistent with the Standard Model expectation. Including the process e+e- -> nu nu gamma gamma, limits are derived on anomalous contributions to the Standard Model quartic vertices W+W- gamma gamma and W+W-Z gamma at 95% CL: -0.043 GeV^-2 < a_0/Lambda^2 < 0.043 GeV^-2 0.08 GeV^-2 < a_c/Lambda^2 < 0.13 GeV^-2 0.41 GeV^-2 < a_n/Lambda^2 < 0.37 GeV^-2

Production of Single W Bosons at \sqrt{s}=189 GeV and Measurement of WWgamma Gauge Couplings

Single W boson production in electron-positron collisions is studied with the L3 detector at LEP. The data sample collected at a centre-of-mass energy of \sqrt{s} = 188.7GeV corresponds to an integrated luminosity of 176.4pb^-1. Events with a single energetic lepton or two acoplanar hadronic jets are selected. Within phase-space cuts, the total cross-section is measured to be 0.53 +/- 0.12 +/- 0.03 pb, consistent with the Standard Model expectation. Including our single W boson results obtained at lower \sqrt{s}, the WWgamma gauge couplings kappa_gamma and lambda_gamma are determined to be kappa_gamma = 0.93 +/- 0.16 +/- 0.09 and lambda_gamma = -0.31 +0.68 -0.19 +/- 0.13

Search for an invisibly decaying Higgs boson in e^+e^- collisions at \sqrt{s} = 183 - 189 GeV

A search for a Higgs boson decaying into invisible particles is performed using the data collected at LEP by the L3 experiment at centre-of-mass energies of 183 GeV and 189 GeV. The integrated luminosities are respectively 55.3 pb^-1 and 176.4 pb^-1. The observed candidates are consistent with the expectations from Standard Model processes. In the hypothesis that the production cross section of this Higgs boson equals the Standard Model one and the branching ratio into invisible particles is 100%, a lower mass limit of 89.2 GeV is set at 95% confidence level

Search for Neutral Higgs Bosons of the Minimal Supersymmetric Standard Model in e+e- Interactions at \sqrt{s} = 189 GeV

A search for the lightest neutral scalar and neutral pseudoscalar Higgs bosons in the Minimal Supersymmetric Standard Model is performed using 176.4 pb^-1 of integrated luminosity collected by L3 at a center-of-mass energy of 189 GeV. No signal is observed, and the data are consistent with the expected Standard Model background. Lower limits on the masses of the lightest neutral scalar and pseudoscalar Higgs bosons are given as a function of tan(beta). Lower mass limits for tan(beta)>1 are set at the 95% confidence level to be m_h > 77.1 GeV and m_A > 77.1 GeV

Measurement of Bose-Einstein Correlations in e+e- -> W+W- at root(s)=189GeV

We investigate Bose-Einstein correlations (BEC) in W-pair production at root(s)=189GeV using the L3 detector at LEP. We observe BEC between particles from a single W decay in good agreement with those from a light-quark Z decay sample. We investigate their possible existence between particles coming from different W's. No evidence for such inter-W BEC is found

Measurement of the Lifetime of the Tau Lepton

The tau lepton lifetime is measured with the L3 detector at LEP using the complete data taken at centre-of-mass energies around the Z pole resulting in tau_tau = 293.2 +/- 2.0 (stat) +/- 1.5 (syst) fs. The comparison of this result with the muon lifetime supports lepton universality of the weak charged current at the level of six per mille. Assuming lepton universality, the value of the strong coupling constant, alpha_s is found to be alpha_s(m_tau^2) = 0.319 +/- 0.015(exp.) +/- 0.014 (theory)

Search for Extra Dimensions in Boson and Fermion Pair Production in e+e- Interactions at LEP

Extra spatial dimensions are proposed by recent theories that postulate the scale of gravity to be of the same order as the electroweak scale. A sizeable interaction between gravitons and Standard Model particles is then predicted. Effects of these new interactions in boson and fermion pair production are searched for in the data sample collected at centre-of-mass energies above the Z pole by the L3 detector at LEP. In addition, the direct production of a graviton associated with a Z boson is investigated. No statistically significant hints for the existence of these effects are found and lower limits in excess of 1 TeV are derived on the scale of this new theory of gravity

Measurement of the Probability of Gluon Splitting into Charmed Quarks in Hadronic Z Decays

We have measured the probability, n(g->cc~), of a gluon splitting into a charm-quark pair using 1.7 million hadronic Z decays collected by the L3 detector. Two independent methods have been applied to events with a three-jet topology. One method relies on tagging charmed hadrons by identifying a lepton in the lowest energy jet. The other method uses a neural network based on global event shape parameters. Combining both methods, we measure n(g->cc~)= [2.45 +/- 0.29 +/- 0.53]%