Search for neutral Higgs bosons in events with multiple bottom quarks at the Tevatron

Abstract

The combination of searches performed by the CDF and D0 collaborations at the Fermilab Tevatron Collider for neutral Higgs bosons produced in association with b quarks is reported. The data, corresponding to 2.6 fb −1 of integrated luminosity at CDF and 5.2 fb −1 at D0, have been collected in final states containing three or more b jets. Upper limits are set on the cross section multiplied by the branching ratio varying between 44 pb and 0.7 pb in the Higgs boson mass range 90 to 300 GeV, assuming production of a narrow scalar boson. Significant enhancements to the production of Higgs bosons can be found in theories beyond the standard model, for example in supersymmetry. The results are interpreted as upper limits in the parameter space of the minimal supersymmetric standard model in a benchmark scenario favoring this decay mode.

Search for the neutral Higgs bosons of the minimal supersymmetric standard model in pp collisions at $ \sqrt{s}=7 $ TeV with the ATLAS detector

“…The most common decay modes at high tan β are to a pair of b-quarks or τ leptons, with branching ratios close to 90% and 10%, respectively, across the mass range considered. The direct decay into two muons occurs rarely, with a branching ratio around 0.04%, but offers a clean signature.Previous searches for neutral MSSM Higgs bosons have been performed at LEP [13], the Tevatron [14][15][16][17][18][19] and the LHC [7, 8]. The recently observed Higgs-boson-like particle at the LHC [20,21] is consistent with both the Standard Model and the lightest CP-even MSSM Higgs boson [22,23].…”

Higgs bosons with large couplings to light quarks

“…These searches are summarized inTable 4, and are recasted as follows. Tevatron sets constraints on the process gb → φb, where φ decays to bb[98]. Here, the kinematic acceptance and b-tagging efficiencies have been unfolded, so we can compute the parton level cross section and branching ratio in our model…”

Search for resonances in $b$-jets final states with the CDF II and the LHCb experiments

“…Searches for heavy resonances decaying into bb jets, and produced in association with b-quark jets have already been performed by the CDF [71] and D0 [80] experiments at the Tevatron collider and by the CMS [81] experiment at LHC. The two Tevatron experiments have combined their results, reporting a deviation, at the level of 2σ, from the Standard Model expectations in the two b-quark jets invariant mass around 100 − 150 GeV/c 2 [5]. The result of the limit is shown in Figure 6.1.…”

“…Finally, the search for a Higgs-like particle, decaying into a bb pair and produced in association with b-quarks at CDF II is described. Many extensions of the Standard Model foreseen new scalar particles with strong coupling to the b quarks, and this search is of particular interested because of a previous Tevatron combined result which reports a deviation at the level of 2σ from the Standard Model expectations in the 100 − 150 GeV/c 2 invariant mass range [5].…”