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The pseudorapidity density of charged particles dN\(_{ ch }\)/d\(\eta \) is measured by the TOTEM experiment in proton–proton collisions at \(\sqrt{s} = 8\) TeV within the range \(3.9<\eta <4.7\) and \(-6.95<\eta <-6.9\). 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 \(p_T>0\) MeV/c, produced in inelastic interactions with at least one charged particle in \(-7<\eta <-6\) or \(3.7<\eta <4.8\). The dN\(_{ ch }\)/d\(\eta \) has been found to decrease with \(|\eta |\), from 5.11 \(\pm \) 0.73 at \(\eta =3.95\) to 1.81 \(\pm \) 0.56 at \(\eta =-\)6.925. Several Monte Carlo generators are compared to the data and are found to be within the systematic uncertainty of the measurement.

Measurement of the forward charged particle pseudorapidity density in pp collisions at $$\sqrt{s} = 8$$ s = 8 TeV using a displaced interaction point