  A search is presented for W' bosons in events with an electron or muon and
large missing transverse momentum, using proton-proton collision data at
sqrt(s) = 13 TeV collected with the CMS detector in 2015 and corresponding to
an integrated luminosity of 2.3 inverse femtobarns. No evidence of an excess of
events relative to the standard model expectations is observed. For a W' boson
described by the sequential standard model, upper limits at 95% confidence
level are set on the product of the production cross section and branching
fraction and lower limits are established on the new boson mass. Masses below
4.1 TeV are excluded combining electron and muon decay channels, significantly
improving upon the results obtained with the 8 TeV data. Exclusion limits at
95% confidence level on the product of the W' production cross section and
branching fraction are also derived in combination with the 8 TeV data.
Finally, exclusion limits are set for the production of generic W' bosons
decaying into this final state using a model-independent approach.
