Measurement of the forward charged particle pseudorapidity density in pp collisions at [Formula omitted] TeV using a displaced interaction point

The pseudorapidity density of charged particles dN /d is measured by the TOTEM experiment in proton-proton collisions at TeV within the range and . Data were collected in a low intensity LHC run with collisions occurring at a distance of 11.25 m from the nominal interaction point. The data sample is expected to include 96-97 % of the inelastic proton-proton interactions. The measurement reported here considers charged particles with MeV/c, produced in inelastic interactions with at least one charged particle in [Formula omitted] or . The dN /d [Formula omitted] has been found to decrease with , from 5.11 0.73 at to 1.81 0.56 at 6.925. Several Monte Carlo generators are compared to the data and are found to be within the systematic uncertainty of the measurement.