Hunting the QCD-Odderon in hard diffractive electroproduction of two pions

Hägler, Ph.; Pire, B.; Szymanowski, L.; Teryaev, Oleg

doi:10.1016/s0370-2693(02)01736-7

Cited by 60 publications

(47 citation statements)

References 36 publications

(39 reference statements)

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“…We follow here the discussion in our previous paper [16] and propose a possible improvement of this GDA in section 5.…”

Section: Generalized Two Pion Distribution Amplitudesmentioning

confidence: 85%

“…In these equations we have denoted the soft QCD-coupling constant byḡ. We take α sof t =ḡ 2 /(4π) = 0.5 as a reasonable mean value (for discussion of this point see our paper [16]). …”

Section: Proton Impact Factorsmentioning

confidence: 99%

“…In this paper we supplement our previous work [16] by the inclusion of contributions from transversely polarized photons to the charge asymmetry. Additionally we study the single spin asymmetry which is proportional to the interference of non-diagonal, i.e.…”

Section: Introductionmentioning

confidence: 96%

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Pomeron-Odderon interference effects in electroproduction of two pions

et al. 2002

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Abstract:We study Pomeron-Odderon interference effects giving rise to charge and single-spin asymmetries in diffractive electroproduction of a π + π − pair. We calculate these asymmetries originating from both longitudinal and transverse polarizations of the virtual photon, in the framework of QCD and in the Born approximation, in a kinematical domain accessible to HERA experiments. We predict a sizable charge asymmetry with a characteristic dependence on the invariant mass of the π + π − pair, which makes this observable very important for establishing the magnitude of the Odderon exchange in hard processes. The single spin asymmetry turns out to be rather small. We briefly discuss future improvements of our calculations and their possible effects on the results.

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“…We follow here the discussion in our previous paper [16] and propose a possible improvement of this GDA in section 5.…”

Section: Generalized Two Pion Distribution Amplitudesmentioning

confidence: 85%

Section: Proton Impact Factorsmentioning

confidence: 99%

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Pomeron-Odderon interference effects in electroproduction of two pions

et al. 2002

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“…On the other hand, this latter property may be used to separate the interference contribution by measuring the charge asymmetric quantity dσ(π + π − ) − dσ(π − π + ) , and thus analysing the TDA subprocess at the amplitude level [23]. …”

Section: The Eγ → Eπmentioning

confidence: 99%

Exclusive meson pair production inγ*γscattering at small momentum transfer

2006

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We study the exclusive production of ππ and ρπ in hard γ ⋆ γ scattering in the forward kinematical region where the virtuality of one photon provides us with a hard scale in the process. The newly introduced concept of Transition Distribution Amplitudes (TDA) is used to perform a QCD calculation of these reactions thanks to two simple models for TDAs. Cross sections for ρπ and ππ production are evaluated and compared to the possible background from the Bremsstrahlung process. This picture may be tested at intense electron-positron colliders such as CLEO and B factories. The cross section eγ → e ′ π 0 π 0 is finally shown to provide a possible determination of the π 0 axial form factor, F π 0 A , at small t, which seems not to be measurable elsewhere.

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“…The inclusion of evolution based on the BKP equation increases the cross section by one order of magnitude [15]. Because of that suggestions were raised to look for Odderon effects in the studies of the charge asymmetries in the two pion diffractive production [16] and η c electroproduction in the triple Regge region [17]. A comprehensive survey of searches for Odderon effects as well as its present day theoretical status is given in the recent review [18].…”

Section: Introductionmentioning

confidence: 99%

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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Hunting the QCD-Odderon in hard diffractive electroproduction of two pions

Cited by 60 publications

References 36 publications

Pomeron-Odderon interference effects in electroproduction of two pions

Pomeron-Odderon interference effects in electroproduction of two pions

Exclusive meson pair production inγ*γscattering at small momentum transfer

Perturbative odderon in the dipole model

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