Elastic and Total Cross-Section Measurements by TOTEM

Apr 9, 2019, 11:45 AM
Cavallerizza Reale - Aula Multifunzione

Cavallerizza Reale - Aula Multifunzione

Via Verdi, 9 Turin
Parallel Session Talk WG2: Low-x and Diffraction WG2: Small-x and Diffraction


Frigyes Janos Nemes (CERN (also at Wigner RCP Budapest, Hungary))


The TOTEM experiment at the LHC has measured proton-proton elastic scattering in dedicated runs at √s = 2.76, 7, 8 and 13 TeV centre-of-mass
LHC energies. The proton-proton total cross-section has been derived for each energy using a luminosity independent method. TOTEM has
excluded a purely exponential differential cross-section for elastic proton-proton scattering with significance greater than 7 σ in the |t| range from
0.027 to 0.2 GeV2 at s√ = 8 TeV. The ρ parameter has been measured at √s = 8 TeV via the Coulomb-nuclear interference, and was found to be
ρ = 0.12 ± 0.03. The measurement has been repeated at 13 TeV and the result ρ = 0.09 ± 0.01 probes the existence of a colourless three-gluon
bound state. The measured 2.76 TeV differential cross-section by TOTEM provides evidence for the colourless 3-gluon bound state, when
compared to the D0 experiment ppbar result at 1.96 TeV (neglecting the small energy difference between TOTEM and D0).

Primary authors

TOTEM Collaboration Frigyes Janos Nemes (CERN (also at Wigner RCP Budapest, Hungary))

Presentation materials