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The four LEP collaborations, ALEPH, DELPHI, L3 and OPAL, have searched for pair-produced charged Higgs bosons in the framework of Two Higgs Doublet Models (2HDMs). The data of the four experiments are statistically combined. The results are interpreted within the 2HDM for Type I and Type II benchmark scenarios. No statistically significant excess has been observed when compared to the Standard Model background prediction, and the combined LEP data exclude large regions of the model parameter space. Charged Higgs bosons with mass below 80 GeV/c^2 (Type II scenario) or 72.5 GeV/c^2 (Type I scenario, for pseudo-scalar masses above 12 GeV/c^2) are excluded at the 95% confidence level

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Multi-Leptons with High Transverse Momentum at HERA

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Aaron
Abdullah WATW[ 42 ]
Abramowicz
Abt I[ 61 ]
Adamczyk L[ 22 ]
Adamus M[ 92 ]
Alexa C[ 1 ]
Alimujiang K[ 34 ]
Andreev V[ 58 ]
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Antonioli P[ 10 ]
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Antunovic B[ 34 ]
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Asmone
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Avila KBC[ 51 ]
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Backovic S[ 69 ]
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Bartel W[ 34 ]
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Begzsuren K[ 88 ]
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Behr J[ 34 ]
Behrens U[ 34 ]
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Bizot JC[ 62 ]
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Borras K[ 34 ]
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Brummer N[ 18 ]
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Buschhorn G[ 61 ]
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Carlin
Cassol Brunner F[ 55 ]
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Ciesielski R[ 34 ]
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Cindolo F[ 10 ]
Contin
Contreras JG[ 51 ]
Cooper Sarkar AM[ 63 ]
Coppola N[ 34 ]
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Coughlan JA[ 25 ]
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de Boer Y[ 34 ]
de Favereau J[ 49 ]
DE PASQUALE Salvatore
De Wolf
Deak M[ 34 ]
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del Peso J[ 54 ]
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Dementiev RK[ 60 ]
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Figiel J[ 21 ]
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Nikiforov A[ 34 ]
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Pandurovic M[ 7 ]
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Roloff P[ 34 ]
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Rostovtsev A[ 57 ]
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Zomer F[ 62 ]
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Zus R.
Publication venue: 'IOP Publishing'
Publication date: 01/01/2009
Field of study

18 pages, 3 figures, revised version with small textual changesEvents with at least two high transverse momentum leptons (electrons or muons) are studied using the H1 and ZEUS detectors at HERA with an integrated luminosity of 0.94 fb^{-1}. The observed numbers of events are in general agreement with the Standard Model predictions. Seven di- and tri-lepton events are observed in e^+p collision data with a scalar sum of the lepton transverse momenta above 100 GeV while 1.94+-0.17 events are expected. Such events are not observed in e^-p collisions for which 1.19+-0.12 are predicted. Total visible and differential di-electron and di-muon photoproduction cross sections are extracted in a restricted phase space dominated by photon-photon collisions