Search for associated production of dark matter with a Higgs boson decaying to b[¯ over b] or γγ at √s=13 =13 TeV
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Sirunyan2017_Article_SearchForAssociatedProductionO(1).pdf
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Author(s)
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Apyan, Aram
Azzolini, Virginia
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Date Issued
August 2017
Journal
Journal of High Energy Physics
Publisher
Springer Nature
Citation
Sirunyan, A. M., A. Tumasyan, W. Adam, E. Asilar, T. Bergauer, J. Brandstetter, et al. “Search for Associated Production of Dark Matter with a Higgs Boson Decaying to b[¯ over b] or γγ at √s=13 TeV.” Journal of High Energy Physics 2017, no. 10 (October 2017). © 2017 The Authors
Version
Final published version
Abstract
A search for dark matter is performed looking for events with large missing transverse momentum and a Higgs boson decaying either to a pair of bottom quarks or to a pair of photons. The data from proton-proton collisions at a center-of-mass energy of 13 TeV, collected in 2015 with the CMS detector at the LHC, correspond to an integrated luminosity of 2.3 fb[superscript −1]. Results are interpreted in the context of a Z′-two-Higgs-doublet model, where the gauge symmetry of the standard model is extended by a U(1)Z ′group, with a new massive Z′ gauge boson, and the Higgs sector is extended with four additional Higgs bosons. In this model, a high-mass resonance Z′ decays into a pseudoscalar boson A and a light SM-like scalar Higgs boson, and the A decays to a pair of dark matter particles. No significant excesses are observed over the background prediction. Combining results from the two decay channels yields exclusion limits in the signal cross section in the m[subscript Z ′]- m[subscript A] phase space. For example, the observed data exclude the Z′mass range from 600 to 1860 GeV, for Z′ coupling strength g[subscript Z ′]= 0.8, the coupling of A with dark matter particles gχ= 1, the ratio of the vacuum expectation values tan β = 1, and m[subscript A]= 300 GeV. The results of this analysis are valid for any dark matter particle mass below 100 GeV.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1007/JHEP10(2017)180
