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Dipartimento di Fisica dell' Università di Bologna and INFN, 40126 Bologna, Italy.
Cavendish Laboratory, Cambridge, CB3 0HE UK.
Eur Phys J C Part Fields. 2012;72(7):2076. doi: 10.1140/epjc/s10052-012-2076-0. Epub 2012 Jul 24.
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. 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 are presented for different choices of tan.
利用OPAL实验在[公式：见正文]处收集的电子-正电子碰撞数据（对应约600皮靶的积分亮度）来搜寻标准模型双希格斯二重态扩展（2HDM）所预言的带电希格斯玻色子。假设带电希格斯玻色子通过对产生，并衰变成[公式：见正文]或AW。未观测到信号。通过将这些结果与之前较低能量下的搜寻结果相结合，得出了与模型无关的带电希格斯玻色子产生截面的限制。在由一般II型2HDM模型所激发的[公式：见正文]假设下，给出了[公式：见正文]平面上的排除区域，并且在95%置信水平下排除了质量高达76.3 GeV的带电希格斯玻色子，与分支比BR(H→ )无关。对I型2HDM模型参数空间进行了扫描，并针对不同的tan选择给出了希格斯玻色子质量[公式：见正文]和的限制。
