# Higgsphobic and fermiophobic Z’ as a single dark matter candidate

Chen, Nan (Department of Physics, Tsinghua University, Beijing, 100084, China) ; Zhang, Ying (School of Science, Xi’an Jiaotong University, Xi’an, 710049, China) ; Wang, Qing (Department of Physics, Tsinghua University, Beijing, 100084, China) (Center for High Energy Physics, Tsinghua University, Beijing, 100084, China) (Collaborative Innovation Center of Quantum Matter, Beijing, 100084, China) ; Cacciapaglia, Giacomo (Université de Lyon, F-69622, Lyon, France) (Université Lyon 1, Villeurbanne, CNRS/IN2P3, UMR5822, Institut de Physique Nucléaire de Lyon, F-69622, Villeurbanne Cedex, France) ; Deandrea, Aldo (Université de Lyon, F-69622, Lyon, France) (Université Lyon 1, Villeurbanne, CNRS/IN2P3, UMR5822, Institut de Physique Nucléaire de Lyon, F-69622, Villeurbanne Cedex, France) (Institut Universitaire de France, 103 boulevard Saint-Michel, 75005, Paris, France) ; Panizzi, Luca (School of Physics and Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, United Kingdom)

23 May 2014

Abstract: A spin-1 Z’ particle as a single dark matter candidate is investigated by assuming that it does not directly couple to the Higgs boson and standard model fermions and does not mix with the photon and Z boson. The remaining dominant vertices are quartic Z ′ Z ′ ZZ and Z ′ Z ′ W + W − , which can induce effective ${Z^{\prime }}{Z^{\prime }}q\overline{q}$ couplings through standard-model gauge-boson loops. We discuss constraints from the cosmological thermal relic density, and direct and indirect-detection experiments, and find that a dark Z’ can only exist above the W boson mass threshold, and the effective quartic coupling of Z ′ Z ′ VV is bounded in the region of 10 −3 ~10 −2 .

Published in: JHEP 1405 (2014) 088