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

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

doi:10.1016/s0370-2693(97)01052-6

Cited by 50 publications

(122 citation statements)

References 11 publications

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“…[8] which is approximately 4 times larger than ours. The reasons for this discrepancy are the following: (i) as discussed above in detail, the amplitude (20) turns out to be smaller in normalization by a factor of 3 compared to the result quoted in [8], and (ii) we use α s (m 2 c ) ≈ 0.387 instead of 0.3 as done in [8]. In Fig.…”

Section: Results On Diffractive Meson Productioncontrasting

confidence: 66%

“…The cross sections for the production of other mesons can be readily obtained by changing corresponding coupling constants given in Eqs. (6,8). The strong coupling constant has been evaluated at the scale µ 2 = Q 2 + |t|.…”

Section: Results On Diffractive Meson Productionmentioning

confidence: 99%

“…The possibility to probe the hard odderon in processes of light meson production in photon-photon collisions at large t was considered in [7]. Recently exclusive η C photoproduction on protons was studied by Czyżewski et al in [8] describing the odderon as three-gluon exchange.…”

Section: Odd Charge-parity Exchangementioning

confidence: 99%

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Diffractive meson production from virtual photons with odd charge-parity exchange

et al. 1998

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We calculate the cross section of diffractive charge-parity C = +1 neutral meson production in virtual photon proton collision at high energies. Due to the opposite C-parities of photon and meson M + (M + = η C , π 0 , a 2 ) this process probes the t-channel C = −1 odderon exchange which is described here as noninteracting three-gluon exchange. Estimates for the cross section of inelastic diffractive process γ * p → η C X p are presented. The total cross section of diffractive η C meson photoproduction is found to be 47 pb. The cross sections for the diffractive production of light mesons (π 0 , a 2 ) in γ * p collisions are of the same order if the photon virtuality Q 2 is m 2 C .1 Supported by German Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie, grant No. 05 7LP91 P0, and in the framework of the German-Polish agreement on scientific and technological cooperation, grant No. N -115 -95. Odd charge-parity exchangeThe increase of luminosity at HERA offers the possibility of experimental investigations of diffractive processes of photo-and electroproduction of neutral charge-parity even mesons M + = π 0 , a 2 , η C at high energies (see, for example, [1]). Studies of these reactions are of great interest since the opposite chargeparities C of photon (C = −1) and M + meson cause definite C-parity C = −1 of the t-channel exchange. Consequently the pomeron exchange being most important at high energies does not contribute there. Therefore these processes allow for clean investigations of other Regge trajectories which are characterized by negative C = −1 parity.Reggeons having C = −1 are the ω trajectory and the odderon. According to fits to data on total hadron-hadron cross sections the intercept of ω trajectory is close to 0.5 [2] and its contribution decreases with energy. The odderon is the C odd partner of pomeron with an intercept ≥ 1 which has been introduced in phenomenology long time ago [3]. It is assumed that, like the pomeron, the odderon is related to gluonic degrees of freedom. The odderon exchange results in a difference between, for example, the total pp and pp cross sections which does not decrease with increasing energy. Up to now there is no indication of that difference in present high energy pp and pp data. Also odderon effects have not been observed in other soft hadronic collisions.The reasons for the absence of the odderon exchange in soft hadronic reactions remains to be understood since in perturbative QCD the pomeron and the odderon appear on the equal footing. In Leading Logarithmic Approximation (LLA) of perturbative QCD the pomeron corresponds to the exchange of two interacting reggeized gluons (hard pomeron) whereas the odderon is described by exchange of three interacting reggeized gluons (hard odderon), see [4]. In Born approximation, i.e. considering the pure three-gluon exchange in the t-channel, the intercept of the odderon is equal to 1. The effect of gluon interactions is expected to increase of odderon intercept [5]. Therefore the hard odderon ...

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Section: Results On Diffractive Meson Productioncontrasting

confidence: 66%

Section: Results On Diffractive Meson Productionmentioning

confidence: 99%

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Diffractive meson production from virtual photons with odd charge-parity exchange

et al. 1998

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“…Correspondingly, a large amount of literature has been devoted to this class of diffractive processes. For large photon virtualities Q 2 , for heavy mass PS mesons (such as η c ), and for large momentum transfers the relevant impact factors for the transition γ(γ * ) →PS have been be calculated perturbatively [2]. As to the Odderon exchange, first studies have used the simplest form, the exchange of three noninteracting gluons in a C=-1 state.…”

Section: Introductionmentioning

confidence: 99%

“…Another line of Odderon investigations, persued by the Heidelberg group, uses a non-perturbative model for the Odderon, based on the idea of a "stochastic QCD vacuum" [3]. Numerical estimates for the cross sections turn out to be very different in these two approaches: the nonperturbative Odderon models tend to give substantially larger cross sections [2][3][4]. Evidently, to guide the experimental search for signatures of the Odderon we have to clarify these discrepancies.…”

Section: Introductionmentioning

confidence: 99%

Diffractive $\eta_c$ photo-and electroproduction with the perturbative QCD Odderon

et al. 2001

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The odderon in high energy elastic pp scattering

2002

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We study the Odderon contribution to elastic pp and pp scattering at high energies. Different models for the Odderon-proton coupling are considered and their effects on the differential cross section in the dip region are investigated. We use a Regge fit by Donnachie and Landshoff as a framework and replace its Odderon contribution by the different models. We consider two models for the Odderon-proton impact factor proposed by Fukugita and Kwieciński and by Levin and Ryskin. In addition we construct a geometric model of the proton which allows us to put limits on the size of a possible diquark cluster in the proton. All models are able to describe the data well. The two models for the impact factor require the strong coupling constant to be fixed rather precisely. In the geometric model a relatively small diquark size is required to describe the data.

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

Cited by 50 publications

References 11 publications

Diffractive meson production from virtual photons with odd charge-parity exchange

Diffractive meson production from virtual photons with odd charge-parity exchange

Diffractive $\eta_c$ photo-and electroproduction with the perturbative QCD Odderon

The odderon in high energy elastic pp scattering

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