Multi-Lepton Events at H1 and Search for Doubly-Charged Higgs Bosons

Abstract

Events with two or more leptons (electrons or muons) with high transverse momentum are measured in electron-proton collisions at HERA using the data sample collected in the period 1994-2005. Multi-lepton events at high transverse momenta are of special interest as these signature might reveal new physics beyond the Standard Model. An example is the single production of doubly-charged Higgs bosons $H_{L,R}^{\pm \pm }$, which couple to leptons of the $i^{\prime }$th and $j^{\prime }$th generation via Yukawa couplings $h_{ij}^{L,R}$. Results from a search for doubly-charged Higgs bosons in the decays into electrons, muons and taus are presented using data taken in the period 1994-2000. No evidence for doubly-charged Higgs production is found and we derive limits on the $h_{ee}^{L,R}$ and $h_{e\mu }^{L,R}$ Yukawa couplings as a function of the $H_{L,R}^{\pm \pm }$ mass.

arXiv comment4 pages, 3 figures, proceedings of the XIII International Workshop on Deep Inelastic Scattering - DIS 2005, Madison, Wisconsin, 2005