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Search for charged Higgs bosons in e+e- collisions at [Formula: see text].

ABSTRACT: A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at [Formula: see text], corresponding to an integrated luminosity of approximately 600 pb-1. Charged Higgs bosons are assumed to be pair-produced and to decay into [Formula: see text], ??? or AW±. No signal is observed. Model-independent limits on the charged Higgs-boson production cross section are derived by combining these results with previous searches at lower energies. Under the assumption [Formula: see text], motivated by general 2HDM type II models, excluded areas on the [Formula: see text] plane are presented and charged Higgs bosons are excluded up to a mass of 76.3 GeV at 95 % confidence level, independent of the branching ratio BR(H±???? ). A scan of the 2HDM type I model parameter space is performed and limits on the Higgs-boson masses [Formula: see text] and mA are presented for different choices of tan?.

SUBMITTER: OPAL Collaboration

PROVIDER: S-EPMC4371074 | biostudies-literature | 2012

REPOSITORIES: biostudies-literature

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Search for charged Higgs bosons in e+e- collisions at [Formula: see text].

Abbiendi G G Ainsley C C Åkesson P F PF Alexander G G Anagnostou G G Anderson K J KJ Asai S S Axen D D Bailey I I Barberio E E Barillari T T Barlow R J RJ Batley R J RJ Bechtle P P Behnke T T Bell K W KW Bell P J PJ Bella G G Bellerive A A Benelli G G Bethke S S Biebel O O Boeriu O O Bock P P Boutemeur M M Braibant S S Brown R M RM Burckhart H J HJ Campana S S Capiluppi P P Carnegie R K RK Carter A A AA Carter J R JR Chang C Y CY Charlton D G DG Ciocca C C Csilling A A Cuffiani M M Dado S S Dallavalle M M De Roeck A A De Wolf E A EA Desch K K Dienes B B Dubbert J J Duchovni E E Duckeck G G Duerdoth I P IP Etzion E E Fabbri F F Ferrari P P Fiedler F F Fleck I I Ford M M Frey A A Gagnon P P Gary J W JW Geich-Gimbel C C Giacomelli G G Giacomelli P P Giunta M M Goldberg J J Gross E E Grunhaus J J Gruwé M M Gupta A A Hajdu C C Hamann M M Hanson G G GG Harel A A Hauschild M M Hawkes C M CM Hawkings R R Herten G G Heuer R D RD Hill J C JC Hoffman K K Horváth D D Igo-Kemenes P P Ishii K K Jeremie H H Jovanovic P P Junk T R TR Kanzaki J J Karlen D D Kawagoe K K Kawamoto T T Keeler R K RK Kellogg R G RG Kennedy B W BW Kluth S S Kobayashi T T Kobel M M Komamiya S S Krämer T T Krasznahorkay A A Krieger P P von Krogh J J Kuhl T T Kupper M M Lafferty G D GD Landsman H H Lanske D D Lellouch D D Letts J J Levinson L L Lillich J J Lloyd S L SL Loebinger F K FK Lu J J Ludwig A A Ludwig J J Mader W W Marcellini S S Marchant T E TE Martin A J AJ Mashimo T T Mättig P P McKenna J J McPherson R A RA Meijers F F Menges W W Merritt F S FS Mes H H Meyer N N Michelini A A Mihara S S Mikenberg G G Miller D J DJ Mohr W W Mori T T Mutter A A Nagai K K Nakamura I I Nanjo H H Neal H A HA O'Neale S W SW Oh A A Okpara A A Oreglia M J MJ Orito S S Pahl C C Pásztor G G Pater J R JR Pilcher J E JE Pinfold J J Plane D E DE Pooth O O Przybycień M M Quadt A A Rabbertz K K Rembser C C Renkel P P Roney J M JM Rossi A M AM Rozen Y Y Runge K K Sachs K K Saeki T T Sarkisyan E K G EKG Schaile A D AD Schaile O O Scharff-Hansen P P Schieck J J Schörner-Sadenius T T Schröder M M Schumacher M M Seuster R R Shears T G TG Shen B C BC Sherwood P P Skuja A A Smith A M AM Sobie R R Söldner-Rembold S S Spano F F Stahl A A Strom D D Ströhmer R R Tarem S S Tasevsky M M Teuscher R R Thomson M A MA Torrence E E Toya D D Trigger I I Trócsányi Z Z Tsur E E Turner-Watson M F MF Ueda I I Ujvári B B Vollmer C F CF Vannerem P P Vértesi R R Verzocchi M M Voss H H Vossebeld J J Ward C P CP Ward D R DR Watkins P M PM Watson A T AT Watson N K NK Wells P S PS Wengler T T Wermes N N Wilson G W GW Wilson J A JA Wolf G G Wyatt T R TR Yamashita S S Zer-Zion D D Zivkovic L L

The European physical journal. C, Particles and fields 20120724 7

A search is made for charged Higgs bosons predicted by Two-Higgs-Doublet extensions of the Standard Model (2HDM) using electron-positron collision data collected by the OPAL experiment at [Formula: see text], corresponding to an integrated luminosity of approximately 600 pb-1. Charged Higgs bosons are assumed to be pair-produced and to decay into [Formula: see text], τντ or AW±. No signal is observed. Model-independent limits on the charged Higgs-bo ...[more]

PMID: 25814843

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Project description:The experimental value for the isospin amplitude [Formula: see text] in [Formula: see text] decays has been successfully explained within the standard model (SM), both within the large [Formula: see text] approach to QCD and by QCD lattice calculations. On the other hand within the large [Formula: see text] approach the value of [Formula: see text] is by at least [Formula: see text] below the data. While this deficit could be the result of theoretical uncertainties in this approach and could be removed by future precise QCD lattice calculations, it cannot be excluded that the missing piece in [Formula: see text] comes from new physics (NP). We demonstrate that this deficit can be significantly softened by tree-level FCNC transitions mediated by a heavy colourless [Formula: see text] gauge boson with a flavour-violating left-handed coupling [Formula: see text] and an approximately universal flavour diagonal right-handed coupling [Formula: see text] to the quarks. The approximate flavour universality of the latter coupling assures negligible NP contributions to [Formula: see text]. This property, together with the breakdown of the GIM mechanisms at tree level, allows one to enhance significantly the contribution of the leading QCD-penguin operator [Formula: see text] to [Formula: see text]. A large fraction of the missing piece in the [Formula: see text] rule can be explained in this manner for [Formula: see text] in the reach of the LHC, while satisfying the constraints from [Formula: see text], [Formula: see text], [Formula: see text], LEP-II and the LHC. The presence of a small right-handed flavour-violating coupling [Formula: see text] and of enhanced matrix elements of [Formula: see text] left-right operators allows one to satisfy simultaneously the constraints from [Formula: see text] and [Formula: see text], although this requires some fine-tuning. We identify the quartic correlation between [Formula: see text] contributions to [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]. The tests of this proposal will require much improved evaluations of [Formula: see text] and [Formula: see text] within the SM, of [Formula: see text] as well as precise tree-level determinations of [Formula: see text] and [Formula: see text]. We present correlations between [Formula: see text], [Formula: see text] and [Formula: see text] with and without the [Formula: see text] rule constraint and generalise the whole analysis to [Formula: see text] with colour ([Formula: see text]) and [Formula: see text] with FCNC couplings. In the latter case no improvement on [Formula: see text] can be achieved without destroying the agreement of the SM with the data on [Formula: see text]. Moreover, this scenario is very tightly constrained by [Formula: see text]. On the other hand, in the context of the [Formula: see text] rule [Formula: see text] is even more effective than [Formula: see text]: it provides the missing piece in [Formula: see text] for [Formula: see text]-[Formula: see text].

Dataset Information

Search for charged Higgs bosons in e+e- collisions at [Formula: see text].

Publications

Search for charged Higgs bosons in e<sup>+</sup>e<sup>-</sup> collisions at [Formula: see text].

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