/ Experiment-HEP arXiv:1106.4250

Search for doubly-charged Higgs boson pair production in ppbar collisions at sqrt{s} = 1.96 TeV

Abstract: We present a search for pair production of doubly-charged Higgs bosons in the processes $q\bar{q} \to {H}^{++}{H}^{--}$ decaying through ${H}^{\pm\pm} \to \tau^{\pm}\tau^{\pm}, \mu^{\pm}\tau^{\pm}, \mu^{\pm}\mu^{\pm}$. The search is performed in ${p}\overline{p}$ collisions at a center-of-mass energy of $\sqrt{s}=1.96$~TeV using an integrated luminosity of $7.0$~fb$^{-1}$ collected by the D0 experiment at the Fermilab Tevatron Collider. The results are used to set $95\%$ C.L.~limits on the pair production cross section of doubly-charged Higgs bosons and on their mass for different ${H}^{\pm\pm}$ branching fractions. Models predicting different ${H}^{\pm\pm}$ decays are investigated. Assuming ${\cal B}({H}^{\pm\pm}\to\tau^{\pm}\tau^{\pm})=1$ yields an observed (expected) lower limit on the mass of a left-handed ${H}^{\pm\pm}_L$ boson of 128 (116)~GeV and assuming ${\cal B}({H}^{\pm\pm}\to\mu^{\pm}\tau^{\pm})=1$ the corresponding limits are 144 (149)~GeV. In a model with ${\cal B}({H}^{\pm\pm} \to \tau^{\pm}\tau^{\pm})={\cal B}({H}^{\pm\pm}\to\ mu^{\pm}\tau^{\pm})={\cal B}({H}^{\pm\pm}\to\mu^{\pm}\mu^{\pm})=1/3$, we obtain $M({H}^{\pm\pm}_L)>130~(138)$~GeV.
We present a search for pair production of doubly-charged Higgs bosons in the processes $q\bar{q} \to {H}^{++}{H}^{--}$ decaying through ${H}^{\pm\pm} \to \tau^{\pm}\tau^{\pm}, \mu^{\pm}\tau^{\pm}, \mu^{\pm}\mu^{\pm}$. The search is performed in ${p}\overline{p}$ collisions at a center-of-mass energy of $\sqrt{s}=1.96$~TeV using an integrated luminosity of $7.0$~fb$^{-1}$ collected by the D0 experiment at the Fermilab Tevatron Collider. The results are used to set $95\%$ C.L.~limits on the pair production cross section of doubly-charged Higgs bosons and on their mass for different ${H}^{\pm\pm}$ branching fractions. Models predicting different ${H}^{\pm\pm}$ decays are investigated. Assuming ${\cal B}({H}^{\pm\pm}\to\tau^{\pm}\tau^{\pm})=1$ yields an observed (expected) lower limit on the mass of a left-handed ${H}^{\pm\pm}_L$ boson of 128 (116)~GeV and assuming ${\cal B}({H}^{\pm\pm}\to\mu^{\pm}\tau^{\pm})=1$ the corresponding limits are 144 (149)~GeV. In a model with ${\cal B}({H}^{\pm\pm} \to \tau^{\pm}\tau^{\pm})={\cal B}({H}^{\pm\pm}\to\ mu^{\pm}\tau^{\pm})={\cal B}({H}^{\pm\pm}\to\mu^{\pm}\mu^{\pm})=1/3$, we obtain $M({H}^{\pm\pm}_L)>130~(138)$~GeV.

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