EPJ

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EPJ C - Particles and Fields
Particles and Fields
Open Access
Eur. Phys. J. C 32, s1.23-s1.40 (2004)
DOI: 10.1140/epjcd/s2003-01-002-8

Possibility of the odderon discovery via observation of charge asymmetry in the diffractive $\ensuremath\pi^+\pi^-$ production at HERA

I.F. Ginzburg1, I.P. Ivanov1, 2 and N.N. Nikolaev2, 3

1  Institute of Mathematics, Novosibirsk, Russia
2  IKP, Forschungszentrum Jülich, Germany
3  L.D. Landau ITP, Moscow, Russia

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(Received 9 August 2002 / Published online 28 January 2003)

Abstract

The interference between the Pomeron and possible odderon mechanisms of diffractive $\ensuremath\pi^+\pi^-$ photoproduction results in charge asymmetry of the produced pions. The observation of charge asymmetry of pions at moderate $M_{\pi^+\pi^-}$ will be an undoubted signal of odderon existence. To make numeral estimates more definite, we limit ourselves by the region $M_{\pi^+\pi^-} = 1.1 \div 1.5$ GeV, where in the odderon mechanism of dipion production, the production via single f2(1270) resonance is expected to be dominant. We find a very statistically significant effect of the odderon induced charge asymmetry even with very modest estimates for the f2 photoproduction cross section (without referring to any particular model of the odderon).



© Società Italiana di Fisica, Springer-Verlag 2004

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