Date of this Version
PHYSICAL REVIEW LETTERS 108, 021801 (2012); DOI: 10.1103/PhysRevLett.108.021801
We present a search for pair production of doubly charged Higgs bosons in the processes qq̅→H++H-- decaying through H±±→τ±τ±, µ±τ±,µ±µ±. The search is performed in pp̅ collisions at a center-of-mass energy of √s = 1.96 TeV using an integrated luminosity of up to 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±± branching fractions. Models predicting different H±± decays are investigated. Assuming B(H±± → τ±τ±) = 1 yields an observed (expected) lower limit on the mass of a left-handed HL±± boson of 128 (116) GeV and assuming B(H±± → µ±τ±) = 1 the corresponding limits are 144 (149) GeV. In a model with B(H±± → τ±τ±) = B(H±± → µ±τ±) = B(H±± → µ±µ±) 1/3, we obtain M(HL±±) > 130 (138) GeV..