Search for a Low-Mass Neutral Higgs Boson with Suppressed Couplings to Fermions Using Events with Multiphoton Final States

TL;DR

This paper searches for a low-mass neutral Higgs boson with suppressed fermion couplings using multiphoton events in proton-antiproton collisions, setting mass exclusion limits between 10 and 100 GeV/c².

Contribution

It presents the first search for a specific Higgs boson with suppressed fermion couplings in multiphoton final states at the Tevatron.

Findings

No evidence of the Higgs boson signal was observed.

Excluded Higgs boson masses between 10 and 100 GeV/c² at 95% credibility.

Used all events with at least three photons from 9.2 fb⁻¹ of data.

Abstract

A search for a Higgs boson with suppressed couplings to fermions, $h_f$, assumed to be the neutral, lower-mass partner of the Higgs boson discovered at the Large Hadron Collider, is reported. Such a Higgs boson could exist in extensions of the standard model with two Higgs doublets, and could be produced via $p\bar{p} \to H^\pm h_f \to W^* h_f h_f \to 4\gamma + X$, where $H^\pm$ is a charged Higgs boson. This analysis uses all events with at least three photons in the final state from proton-antiproton collisions at a center-of-mass energy of 1.96~TeV collected by the Collider Detector at Fermilab, corresponding to an integrated luminosity of 9.2~${\rm fb}^{-1}$. No evidence of a signal is observed in the data. Values of Higgs-boson masses between 10 and 100 GeV/$c^2$ are excluded at 95\% Bayesian credibility.