Apr 16 – 20, 2018
Kobe University Convention Centre / Kobe International Conference Center
Asia/Tokyo timezone

Measurement of the Total Cross-Section and the rho-Parameter at 13 TeV by TOTEM

Apr 18, 2018, 5:18 PM


WG2: Small-x and Diffraction WG2: Small-x and Diffraction


Enrico Robutti (INFN e Universita Genova (IT))


The TOTEM experiment at the interaction point 5 of the LHC has measured the total, elastic and inelastic proton-proton cross sections in a centre-of-mass energy range from 2.76 to 13 TeV, in dedicated fills with special beam optics.

Most recently, TOTEM has performed the first measurement of the ρ parameter at $\sqrt{s} = 13$ TeV, where rho is the ratio between the real and the imaginary part of the nuclear elastic scattering amplitude at t = 0.
The unprecedented precision of the measurement, combined with the TOTEM total cross-section measurements, led to the exclusion of all the models classified and published by COMPETE. The ρ and σtot results obtained by TOTEM are compatible with predictions -- from alternative theoretical models both in the Regge-like framework and in the modern QCD framework -- of a colourless 3-gluon bound state exchange in the t-channel of the proton-proton elastic scattering.

Primary author

Enrico Robutti (INFN e Universita Genova (IT))


Presentation materials