First determination of the $\rho$ parameter at $\sqrt{s}=13$ TeV -- probing the existence of a colourless three-gluon bound state

TOTEM Collaboration, G. Antchev, P. Aspell +93

The TOTEM experiment at the LHC has performed the first measurement at $\sqrt{s}=13$ TeV of the $\rho$ parameter, the real to imaginary ratio of the nuclear elastic scattering ampli…