Search for dark matter produced in association with a Higgs boson decaying to γγ or τ + τ − at √s=13 TeV

• Main Authors: Sirunyan, A. M., Tumasyan, A. R., Adam, Wolfgang, Ambrogi, Federico, Asilar, Ece, Md. Ali, Mohd. Adli
• Format: Article
• Language: English; English
• Published: Springer Verlag 2018
• Subjects: Q Science (General); QC Physics
• Online Access: http://irep.iium.edu.my/70348/1/70348_Search%20for%20dark%20matter%20produced%20in%20association_article.pdf; http://irep.iium.edu.my/70348/2/70348_Search%20for%20dark%20matter%20produced%20in%20association_scopus.pdf; http://irep.iium.edu.my/70348/; https://link.springer.com/content/pdf/10.1007%2FJHEP09%282018%29046.pdf
• Institution: Universiti Islam Antarabangsa Malaysia

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 Z0 -two-Higgs-doublet model (where Z0 is a new massive boson mediator) with an intermediate heavy pseudoscalar particle of mass mA = 300 GeV and mDM = 100 GeV, the Z0 masses from 550 GeV to 1265 GeV are excluded. For a baryonic Z0 model, with mDM = 1 GeV, Z0 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.