Exclusive ηc photo- and electroproduction at HERA as a possible probe of the odderon singularity in QCD

Czyzewski, J.; Kwieciński, J.; Motyka, Leszek; Sadzikowski, Mariusz

doi:10.1016/s0370-2693(97)00249-9

Cited by 43 publications

(22 citation statements)

References 16 publications

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“…(2) and being a solution of Eq. (7) can always be decomposed in a series (14). Therefore, for the scattering of a dipole on any target the resulting cross section can not grow with center of mass energy s faster than s 0 as follows from the intercept of Eq.…”

Section: Connection To Traditional Approachesmentioning

confidence: 99%

“…Recent data on the differential elastic pp scattering show that one needs the Odderon to describe the cross sections in the dip region [13]. On the other hand, the perturbative QCD prediction in the Born approximation for the cross section of diffractive photoproduction of η c −meson is rather small [14]. The inclusion of evolution based on the BKP equation increases the cross section by one order of magnitude [15].…”

Section: Introductionmentioning

confidence: 99%

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Perturbative odderon in the dipole model

2004

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We show that, in the framework of Mueller's dipole model, the perturbative QCD odderon is described by the dipole model equivalent of the BFKL equation with a Codd initial condition. The eigenfunctions and eigenvalues of the odderon solution are the same as for the dipole BFKL equation and are given by the functions E n,ν and χ(n, ν) correspondingly, where the C-odd initial condition allows only for odd values of n. The leading high-energy odderon intercept is given by α odd − 1 = 2 αs Nc π χ(n = 1, ν = 0) = 0 in agreement with the solution found by Bartels, Lipatov and Vacca. We proceed by writing down an evolution equation for the odderon including the effects of parton saturation. We argue that saturation makes the odderon solution a decreasing function of energy.

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Section: Connection To Traditional Approachesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Perturbative odderon in the dipole model

2004

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“…The η c photoproduction is not the only process which may probe the QCD odderon and the photoproduction of other cc bound states characterised by positive charge conjugation should presumably be useful as well. Theoretical analysis of these and related processes is in progress [18].…”

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confidence: 99%

Exclusive η photo- and electroproduction at HERA as a possible probe of the odderon singularity in QCD [Phys. Lett. B 398 (1997) 400]

Czyzewski¹,

Kwieciński²,

Motyka³

et al. 1997

Physics Letters B

111

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Theory and phenomenology of the η c photo-and electroproduction is developed from the point of view of probing the odderon singularity in QCD which corresponds to the three gluon exchange mechanism. This mechanism leads to the cross-sections which are independent of W 2 for the exchange of three noninteracting gluons or exhibit increase with increasing W 2 (or 1/x) for the odderon intercept above unity. The η c electroproduction in the three gluon exchange mechanism is shown to be entirely controlled by the transversely polarised virtual photons. The magnitude of the η c photoproduction cross-section is estimated to be around 11-45 pb. The t-dependence of the differential cross-section is also discussed.

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“…Table 1 Best fit values for the diquark size This casts some doubt on predictions of diffrative η c production. Three groups [9][10][11] have used the FK impact factor with a value of α s = 1 in calculations of the diffractive η c production amplitude. In view of our results, this looks like a significant overestimation.…”

Section: Resultsmentioning

confidence: 99%