28 July 2020 to 6 August 2020
virtual conference
Europe/Prague timezone

Searching for odderon exchange in exclusive $pp \to pp \phi$ and $pp \to pp \phi \phi$ reactions at the LHC

29 Jul 2020, 15:55
15m
virtual conference

virtual conference

Talk 06. Strong Interactions and Hadron Physics Strong Interactions and Hadron Physics

Speaker

Piotr Lebiedowicz (Institute of Nuclear Physics PAN)

Description

We discuss the possibility to use the $pp \to pp \phi$ and $pp \to pp \phi \phi$ reactions in identifying the odderon exchange. So far there is no unambiguous experimental evidence for the odderon, the charge conjugation C = -1 counterpart of the C = +1 pomeron, introduced on theoretical grounds in [1]. Last year results of the TOTEM collaboration [2] suggest that the odderon exchange can be responsible for a disagreement of theoretical calculations and the TOTEM data [4] for elastic proton-proton scattering. Similar conclusion can be drawn when comparing recent result for $\sqrt{s}$ = 2.76 TeV with the Tevatron data [3]. It is premature to draw definite conclusion. Here we present some recent studies for two related processes where the odderon exchange may show up. We apply recently proposed tensor-pomeron and vector-odderon model for soft high-energy reactions [5].

The first reaction is central exclusive production of pairs of $\phi$ mesons. Here odderon exchange is not excluded by the WA102 experimental data [8] for high $\phi \phi$ invariant masses. The process is advantageous [6] as here odderon does not couple to protons (the corresponding coupling constant is probably small). Predictions for the LHC will be presented. The observation of $M_{\phi \phi}$ and the rapidity difference $Y_{\phi \phi}$ seems well suited to identify odderon exchange.

Finally we discuss the $p p \to p p \phi$ reaction [7]. 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 $\phi \phi$ production improves considerably description of the proton-proton angular correlations measured by the WA102 collaboration [9]. 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] L. Łukaszuk, B. Nicolescu, Lett. Nuovo Cim. 8 (1973) 405.
[2] TOTEM Collaboration, Eur. Phys. J. C79 (2019) 785.
[3] TOTEM Collaboration, TOTEM-2018-002, arXiv:1812.08610 [hep-ex].
[4] E. Martynov, B. Nicolescu, Phys. Lett. B786 (2018) 207.
[5] C. Ewerz, M. Maniatis, O. Nachtmann, Annals Phys. 342 (2014) 31.
[6] P. Lebiedowicz, O. Nachtmann, A. Szczurek, Phys. Rev. D99 (2019) 094034.
[7] P. Lebiedowicz, O. Nachtmann, A. Szczurek, arXiv:1911.01909 [hep-ph].
[8] WA102 Collaboration, Phys. Lett. B432 (1998) 436.
[9] A. Kirk, Phys. Lett. B489 (2000) 29.

Primary authors

Piotr Lebiedowicz (Institute of Nuclear Physics PAN) Otto Nachtmann (U) Antoni Szczurek (Institute of Nuclear Physics)

Presentation Materials