Universality test of the charged Higgs boson couplings at the LHC and at B factories

Many extensions of the standard model of particle physics predict the existence of charged Higgs bosons with substantial couplings to standard model particles, which would render them observable both directly at the LHC and indirectly at B-factories. For example, the charged Higgs boson couplings to fermions in two Higgs doublet models of type II are proportional to the ratio of the two Higgs doublet vacuum expectation values (tanβ) and fermionic mass factors and could thus be substantial at large tanβ and/or for heavy fermions. In this work we perform a model-independent study of the charged Higgs boson couplings at the LHC and at B-factories for large values of tanβ. We have shown that at high luminosity it is possible to measure the couplings of a charged Higgs boson to the third generation of quarks up to an accuracy of 10%. We further argue that by combining the possible measurements of the LHC and the B-factories, it is possible to perform a universality test of charged Higgs boson couplings to quarks.