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arXiv 0706.0441hep-ph
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双电荷标量对的产生:中微子质量约束和LHC上的信号

Pair Production of Doubly-Charged Scalars: Neutrino Mass Constraints and Signals at the LHC

Tao Han, Biswarup Mukhopadhyaya, Zongguo Si, Kai Wang

摘要:

我们研究了在大型强子对撞机(LHC)上双电荷希格斯玻色子的成对产生,假设双电荷希格斯玻色子是产生左手中微子Majorana质量的SU(2)_L三重态的一部分.这种成对生产的优点在于,它不受三重真空期望值的限制,这往往会使单个生产率相当小。我们指出,除了Drell-Yan(DY)产生机制外,双光子过程对H++H++产生的贡献与DY通道的QCD修正相当.详细研究了双电荷Higgs粒子衰变到l+l+和W+W+模的过程,以优化背景下的信号观测。在大型强子对撞机上,当积分光度为300 fb^-1时,在11通道直到1 TeV的质量范围内,即使分支分数约为60%,也应该可以观测到双电荷标量,而在WW通道直到700 GeV的质量范围内,也应该可以观测到双电荷标量。这样一个双电荷的希格斯粒子,如果它是产生中微子质量的三重态的一员,就不能在对撞机探测器的尺度上长期存在,尽管如果它轻于250 GeV左右,它可能会在衰变过程中导致一个移位的次级顶点。

英文摘要:

We study the pair production of doubly charged Higgs bosons at the Large Hadron Collider (LHC), assuming the doubly charged Higgs to be part of an SU(2)_L triplet which generates Majorana masses for left-handed neutrinos. Such pair-production has the advantage that it is not constrained by the triplet vacuum expectation value, which tends to make the single production rate rather small. We point out that, in addition to the Drell-Yan (DY) production mechanism, two-photon processes also contribute to H++H++ production at a level comparable to the QCD corrections to the DY channel. Decays of the doubly charged Higgs into both the l+l+ and W+W+ modes are studied in detail to optimize the signal observation over the backgrounds. Doubly charged scalars should be observable at the LHC with 300 fb^-1 integrated luminosity in the ll channel upto the mass range of 1 TeV even with a branching fraction of about 60 %, and in the WW channel upto a mass of 700 GeV. Such a doubly charged Higgs, if it is a member of a triplet generating neutrino masses,cannot be long-lived on the scale of collider detectors although it might lead to a displaced secondary vertex during its decay if it is lighter than about 250 GeV.

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