Discovering an invisibly decaying Higgs boson at hadron colliders
- Department of Physics, University of Wisconsin, Madison, Wisconsin 53706 (United States)
A Higgs boson lighter than 2m{sub W} 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, h{sub inv}, at the LHC and the Tevatron in three production modes: (1) in association with a Z (2) through weak boson fusion (WBF), and (3) accompanied by a jet. In the Z+h{sub inv} channel, we show that the LHC can yield a discovery signal above 5{sigma} with 10 fb{sup -1} of integrated luminosity for a Higgs mass of 120 GeV. With 30 fb{sup -1} the discovery reach extends up to a Higgs mass of 160 GeV. We also study the extraction of the h{sub inv} mass from production cross sections at the LHC, and find that combining WBF and Z+h{sub inv} allows a relatively model-independent determination of the h{sub inv} mass with an uncertainty of 35-50 GeV (15-20 GeV) with 10 (100) fb{sup -1}. At the Tevatron, a 3{sigma} observation of a 120 GeV h{sub inv} in any single channel is not possible with less than 12 fb{sup -1} per detector. However, we show that combining the signal from WBF with the previously studied Z+h{sub inv} channel allows a 3{sigma} observation of h{sub inv} with 7 fb{sup -1} per detector. Because of overwhelming irreducible backgrounds, h{sub inv}+j is not a useful search channel at either the Tevatron or the LHC, despite the larger production rate.
- OSTI ID:
- 20709485
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 71, Issue 11; Other Information: DOI: 10.1103/PhysRevD.71.115007; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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