https://doi.org/10.1140/epjc/s10052-017-4904-8
Regular Article - Theoretical Physics
NLO+NLL collider bounds, Dirac fermion and scalar dark matter in the B–L model
1
Institut für Theoretische Physik, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 9, 48149, Münster, Germany
2
Southern Methodist University, Dallas, TX, 75275, USA
3
Particle and Astroparticle Physics Division, Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117, Heidelberg, Germany
* e-mail: farinaldo.queiroz@mpi-hd.mpg.de
Received:
30
January
2017
Accepted:
9
May
2017
Published online:
25
May
2017
Baryon and lepton numbers being accidental global symmetries of the Standard Model (SM), it is natural to promote them to local symmetries. However, to preserve anomaly-freedom, only combinations of B–L are viable. In this spirit, we investigate possible dark matter realizations in the context of the 
model: (i) Dirac fermion with unbroken B–L; (ii) Dirac fermion with broken B–L; (iii) scalar dark matter; (iv) two-component dark matter. We compute the relic abundance, direct and indirect detection observables and confront them with recent results from Planck, LUX-2016, and Fermi-LAT and prospects from XENON1T. In addition to the well-known LEP bound 
TeV, we include often ignored LHC bounds using 13 TeV dilepton (dimuon + dielectron) data at next-to-leading order plus next-to-leading logarithmic accuracy. We show that, for gauge couplings smaller than 0.4, the LHC gives rise to the strongest collider limit. In particular, we find 
TeV for 
. We conclude that the NLO+NLL corrections improve the dilepton bounds on the 
mass and that both dark matter candidates are only viable in the resonance region, with the parameter space for scalar dark matter being fully probed by XENON1T. Lastly, we show that one can successfully have a minimal two-component dark matter model.
© The Author(s), 2017
