Experimentally Verifiable $U(1)_{\rm B-L}$ Symmetric Model with Type-II
  Seesaw and Dark Matter
  In an endeavor to explain the light neutrino masses and dark matter (DM)
simultaneously, we study a gauged $U(1)_{\rm B-L}$ extension of the standard
model (SM). The neutrino masses are generated through a variant of type-II
seesaw mechanism in which one of the scalar triplets has a mass in a scale that
is accessible at the present generation colliders. Three right chiral fermions
$\chi_{iR}$($i=e,\mu,\tau$) with $\rm B-L$ charges -4, -4, +5 are invoked to
cancel the $\rm B-L$ gauge anomalies and the lightest one among these three
fermions becomes a viable DM candidate as their stability is guaranteed by a
remnant $\mathcal Z_2$ symmetry to which $U(1)_{\rm B-L}$ gauge symmetry gets
spontaneously broken. Interestingly in this scenario, the neutrino mass and the
co-annihilation of DM are interlinked through the breaking of $U(1)_{\rm B-L}$
symmetry. Apart from giving rise to the observed neutrino mass and dark matter
abundance, the model also predicts exciting signals at the colliders especially
regarding the discovery of the triplet scalar in presence of the $\rm B-L$
gauge boson. We see a $(34-54)\%$ enhancement in the production of the TeV
scale doubly charged scalar in presence of the $Z_{\rm BL}$ gauge boson in a
mass range $2.5$ TeV to $4.4$ TeV. We discuss all the relevant constraints on
model parameters from observed DM abundance and null detection of DM at direct
and indirect search experiments as well as the constraints on the $\rm B-L$
gauge boson from recent colliders.
