Abstract
A Higgs boson lighter than that decays mostly into invisible channels (e.g., dark matter particles) is theoretically well-motivated. We study the prospects for discovery of such an invisible Higgs, , at the LHC and the Tevatron in three production modes: (1) in association with a , (2) through weak boson fusion (WBF), and (3) accompanied by a jet. In the channel, we show that the LHC can yield a discovery signal above with of integrated luminosity for a Higgs mass of 120 GeV. With the discovery reach extends up to a Higgs mass of 160 GeV. We also study the extraction of the mass from production cross sections at the LHC, and find that combining WBF and allows a relatively model-independent determination of the mass with an uncertainty of 35–50 GeV (15–20 GeV) with . At the Tevatron, a observation of a 120 GeV in any single channel is not possible with less than per detector. However, we show that combining the signal from WBF with the previously studied channel allows a observation of with per detector. Because of overwhelming irreducible backgrounds, is not a useful search channel at either the Tevatron or the LHC, despite the larger production rate.
- Received 3 March 2005
DOI:https://doi.org/10.1103/PhysRevD.71.115007
©2005 American Physical Society