Speaker
Description
P. Lebiedowicz, O. Nachtmann and A. Szczurek
Last year results of the TOTEM collaboration suggest
that the odderon exchange can be responsible for a disagreement
of theoretical calculations and the TOTEM data (recent Nicolescu papers)
for elastic proton-proton scattering. Similar conclusion can be drawn when
comparing recent $p p$ result for $\sqrt{s}$ = 2.74 TeV with the Tevatron data.
It is premature to draw definite conclusion.
Here we present our recent studies for two related proceses
where the odderon exchange may show up.
The first one is central exclusive production of pairs of $\phi$
mesons. Here odderon exchange is not excluded by the WA102
experimental data for high $\phi \phi$ invariant
masses. The process is advantegous [1]
as here odderon does not couple to protons
(the corresponding coupling constant is probably small).
Predictions for the LHC will be presented.
The distribution in $M_{\phi \phi}$ and the rapidity difference
$Y_{\phi \phi}$ seem well suited to identify odderon exchange.
Finally we discuss a possibility to search for odderon exchange
for the $p p \to p p \phi$ reaction \cite{LNS2019_phi}.
At high energies probably the photon-pomeron fusion is the dominant
process. The odderon-pomeron fusion is an interesting alternative.
Adding odderon exchange with parameters adjusted for the $\phi \phi$
final state improves considerably description of the $p p$ angular
correlations measured in the past by
the WA102 collaboration at $\sqrt{s}$ = 29.1 GeV.
At the low energy we consider also some other subleading processes
that turned out to be rather small.
Predictions for the LHC will be presented.
[1] P. Lebiedowicz, O. Nachtmann and A. Szczurek,
xArxiv:1901.11490, in print in Phys. Rev. D.
[2] P. Lebiedowicz, O. Nachtmamm and A. Szczurek,
a paper in preparation.
