Altas Energías

Measuring intact protons at the LHC: From the odderon discovery to the search for axion-like particles

by Prof. Christophe Royon (University of Kansas)

Wednesday, 22 September 2021 from to (Mexico/General)
at ICN-UNAM ( Seminario virtual vía Zoom )
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In the first part of the talk, we will describe the odderon discovery by the
TOTEM and D0 experiments. The analysis compares the p pbar elastic cross
section as measured by the D0 Collaboration at a center-of-mass energy of
1.96 TeV to that in pp collisions as measured by the TOTEM Collaboration at
2.76, 7, 8, and 13 TeV. The two data sets disagree at the 3.4 sigma level and
thus provide evidence for the t-channel exchange of a colorless, C-odd
gluonic compound, also known as the odderon. We combine these results with a
TOTEM analysis of the same C-odd exchange based on the total cross section
and the ratio of the real to imaginary parts of the forward elastic strong
interaction scattering amplitude in pp scattering, leading to a combined
significance larger than 5 sigma.
In a second part of the talk, we will describe the perspective on the search
for quartic anomalous couplings and axion-like particles using tagged protons
in the final state, leading to sensitivities to beyond standard model physics
that improve by 2 to 3 orders of magnitude on the coupling. We will finish by
decribing briefly the ultra fast silicon detectors for timing measurements as
well as for medical and cosmic ray physics applications.

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