Elastic differential cross-section measurement at [Formula omitted] TeV by TOTEM

The TOTEM collaboration has measured the elastic proton-proton differential cross section [Formula omitted] at [Formula omitted] TeV LHC energy using dedicated [Formula omitted] m beam optics. The Roman Pot detectors were inserted to 10 [Formula omitted] distance from the LHC beam, which allowed the measurement of the range [0.04 GeV [Formula omitted]; 4 GeV [Formula omitted] [Formula omitted] in four-momentum transfer squared |t|. The efficient data acquisition allowed to collect about 10 [Formula omitted] elastic events to precisely measure the differential cross-section including the diffractive minimum (dip), the subsequent maximum (bump) and the large-|t| tail. The average nuclear slope has been found to be [Formula omitted]GeV [Formula omitted] in the |t|-range 0.04-0.2 GeV [Formula omitted]. The dip position is [Formula omitted]GeV [Formula omitted]. The differential cross section ratio at the bump vs. at the dip [Formula omitted] has been measured with high precision. The series of TOTEM elastic pp measurements show that the dip is a permanent feature of the pp differential cross-section at the TeV scale.