  The production of electroweak bosons (photons, W and Z particles) in PbPb and
pp collisions at sqrt(s) = 2.76 TeV per interacting nucleon pair has been
measured with the CMS detector at the LHC. Direct photon production is studied
using samples of isolated photons. W and Z bosons are reconstructed through
their leptonic decay into muons. Their production rate in PbPb data is studied
as a function of the centrality of the collision and compared to that in pp
interactions, once normalized by the number of binary nucleon-nucleon
interactions. The results are also compared to next-to-leading-order
perturbative QCD calculations.
