Double-diffractive J/ψ and φ production as a probe for the odderon

Quarkonium production in coherent hadron-hadron interactions at the CERN LHC

“…Recently, the exclusive J/Ψ and Υ hadroproduction in pp/pp collisions were estimated in Ref. [33] considering the pomeron-odderon fusion (See also [34]). Although there is a large uncertainty in the predictions for pomeron-odderon fusion, it can be of order of our predictions for the photoproduction of vector mesons.…”

Observation of Exclusive Charmonium Production andγγ→μ+μ−inpp¯Collisions atAaltonen1, Adelman2, Akimoto3 et al. 2009Phys. Rev. Lett.1625820View full textAdd to dashboardCite

“…If regions of rapidity exceeding about 5 units are devoid of particles, only photon and pomeron [2], IP , exchanges are significant, where IP consists mostly of two gluons in a color singlet state with charge parity C = +1. Odderon, O, exchange, with 3 gluons in a C = −1 state [3,4,5], is allowed in pp, but not ep, collisions, and would appear as an enhancement in exclusive J/ψ and ψ(2S) production in pp compared to the expectation from pure photoproduction in ep. Using the CDF II detector at the Fermilab Tevatron, we previously observed [6] p +p → p + e + e − +p in agreement with QED, and found candidates [7] for p +p → p + γγ +p consistent with QCD expectations [8].…”

Chiral symmetry and diffractive neutral pion photo- and electroproduction

“…But otherwise conclusive evidence for the existence of the odderon is missing. In [9,10,11] it was suggested to look for the odderon in the reaction (1). Subsequently, the photoproduction of π 0 was investigated in detail in [12].…”