Luminosity measurement in proton-proton collisions at 5.02 TeV in 2017 at CMS

The measurement of the integrated luminosity for the proton-proton collisions run at a center-of-mass energy of $5.02\,\mathrm{TeV}$ in 2017 with the CMS experiment is reported. The absolute luminosity scale is calibrated with the van der Meer scan method. The precision of the calibration is limited by the estimation of the beam separation, the description of electromagnetic interactions between colliding proton bunches, and the uncertainty in the estimated factorization bias. Continuous rate measurements with the forward hadron calorimeter and the Pixel Luminosity Telescope provide a very stable and linear luminosity measurement. The integrated luminosity recorded by the CMS experiment when the detector was fully operational is measured to be $302\,\mathrm{pb}^{-1}$, with a relative uncertainty of $1.9\%$.