Search for Doubly Charged Higgs Bosons Decaying to Dileptons inpp¯Collisions ats=1.96  T

Abstract

We present the results of a search for doubly charged Higgs bosons (H+/-+/-) decaying to dileptons (ll(')) using approximately 240 pb(-1) of pp collision data collected by the CDF II experiment at the Fermilab Tevatron. In our search region, given by same-sign ll(') mass m(ll('))>80 GeV/c(2) (100 GeV/c(2) for ee channel), we observe no evidence for H+/-+/- production. We set limits on sigma(pp -->H++H---->l(+)l('+)l(-)l('-)) as a function of the mass of the H+/-+/- and the chirality of its couplings. Assuming exclusive same-sign dilepton decays, we derive lower mass limits on H(+/-+/-)(L) of 133, 136, and 115 GeV/c(2) in the ee, mumu, and emu channels, respectively, and a lower mass limit of 113 GeV/c(2) on H(+/-+/-)(R) in the mumu channel, all at the 95% confidence level.

Higgs potential in the type II seesaw model

“…For example, if H ±± → e ± e ± is the dominant decay, then the lower limit is 100 GeV while if H ±± → µ ± τ ± is the dominant decay then the lower limit is about 95 GeV. At the Tevatron, D∅ [62], [63] and CDF [64], [65] have searched for pp → γ * , Z * → H ±± H ∓∓ X with H ±± → l ± l ± . D∅ measurement [62] represents the first doubly charged Higgs search with the decay H ±± → µ ± µ ± .…”

Higgs boson decay into 2 photons in the type II Seesaw model

“…Due to its spectacular signature from H ±± → l ± l ± , the doubly charged Higgs has been searched by many experiments such as LEP, Tevatron and LHC. At the Tevatron, D∅ [47], [48] and CDF [49], [50] excluded a doubly charged Higgs with a mass in the range 100 → 150 GeV. Recently, CMS also performed with 1 fb −1 luminosity a search for doubly charged Higgs decaying to a pair of leptons, setting a lower mass limit of 313 GeV from H ±± → µ ± µ ± , e ± e ± , µ ± e ± [51].…”

A realistic model of neutrino masses with a large neutrinoless double beta decay rate

“…Limits on this type of scalars have been also derived using Tevatron data [76][77][78], leading to a limit m κ > 100 − 150 GeV (depending on the details of the model).…”