The Missing Odderon

Abstract

In contrast to theoretical expectations, experimental results at sqrt(s)=200 GeV for the reaction gamma p --> pi0 X show no evidence for odderon exchange. The upper limit on the cross section is an order of magnitude smaller than the theoretical estimate. It is argued that chiral symmetry leads to a large suppression, taking the thoeretical estimates well below the data. Two additional arguments are presented which may decrease the theoretical estimate further. The calculations are more sensitive to the assumptions made in evaluating the hadronic scattering amplitude than in the processes considered previously and lattice gauge calculations indicate that the odderon intercept may be appreciably lower than usually assumed. These two latter effects are particularly relevant for the reactions gamma p --> f2(1270)X and gamma p --> a2(1320)X for which the data upper limits are also below the theoretical predictions, but not so dramatically as for gamma p --> pi0 X.

12 pages, 3 figures

References in corpus (12)

• The glueball spectrum from an anisotropic lattice study
• Field correlators in QCD. Theory and applications
• Non-Perturbative QCD Treatment of High-Energy Hadron-Hadron Scattering
• Glueball Regge trajectories and the Pomeron -- a lattice study --
• Solution of the Odderon Problem
• Glueball masses and Pomeron trajectory in nonperturbative QCD
• Confining QCD Strings, Casimir Scaling, and a Euclidean Approach to High-Energy Scattering
• Observing the Odderon: Tensor Meson Photoproduction
• The Odderon in High Energy Elastic pp Scattering
• Nucleon Structure and High Energy Scattering
• Search for Odderon-Induced Contributions to Exclusive pi^0 Photoproduction at HERA
• SU(3) Flux Tubes in a Model of the stochastic Vacuum

Cited by in corpus (8)

• Introduction to the physics of the total cross-section at LHC: A Review of Data and Models
• Photoproduction of pi+ pi- pairs in a model with tensor-pomeron and vector-odderon exchange
• Exclusive $pp\to pp{\pi }^0$ reaction at high energies
• Searching for the odderon in $pp\to pp{K}^{+}{K}^{-}$ and $pp\to pp{\mu }^{+}{\mu }^{-}$ reactions in the $\varphi (1020)$ resonance region at the LHC
• Investigating the central diffractive f0(980) and f2(1270) meson production at the LHC
• Chiral Symmetry and Diffractive Neutral Pion Photo- and Electroproduction
• New limits on "odderon" amplitudes from analyticity constraints
• Central soft production of hadrons in $pp$ collisions