1. Search for dark matter produced in association with a Higgs boson decaying to $\gamma\gamma$ or $\tau^+\tau^-$ at $\sqrt{s} =$ 13 TeV
- Author
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CMS collaboration (2304 authors), Nayak, Aruna, Bargassa, Pedrame, Da Cruz E Silva, Crist�v�o Beir�o, Di Francesco, Agostino, Faccioli, Pietro, Galinhas, Bruno, Gallinaro, Michele, Hollar, Jonathan, Leonardo, Nuno, Iglesias, Lara Lloret, Seixas, Joao, Strong, Giles, Toldaiev, Oleksii, Vadruccio, Daniele, Varela, Joao, Vischia, Pietro, David Tinoco Mendes, Andre, Silva, Pedro, and Musella, Pasquale
- Subjects
High Energy Physics::Phenomenology ,High Energy Physics::Experiment ,Nuclear Experiment - Abstract
A search for dark matter particles is performed by looking for events with large transverse momentum imbalance and a recoiling Higgs boson decaying to either a pair of photons or a pair of τ leptons. The search is based on proton-proton collision data at a center-of-mass energy of 13 TeV collected at the CERN LHC in 2016 and corresponding to an integrated luminosity of 35.9 fb$^{−1}$. No significant excess over the expected standard model background is observed. Upper limits at 95% confidence level are presented for the product of the production cross section and branching fraction in the context of two benchmark simplified models. For the Z$^{′}$-two-Higgs-doublet model (where Z$^{′}$ is a new massive boson mediator) with an intermediate heavy pseudoscalar particle of mass m$_{A}$ = 300 GeV and m$_{DM}$ = 100 GeV, the Z$^{′}$ masses from 550 GeV to 1265 GeV are excluded. For a baryonic Z$^{′}$ model, with m$_{DM}$ = 1 GeV, Z$^{′}$ masses up to 615 GeV are excluded. Results are also presented for the spin-independent cross section for the dark matter-nucleon interaction as a function of the mass of the dark matter particle. This is the first search for dark matter particles produced in association with a Higgs boson decaying to two τ leptons.
- Published
- 2018