Twist-4 effects and Q2 dependence of diffractive DIS

Bertini, M.; Genovese, M.; Николаев, Н. Н.; Pronyaev, A. V.; Захаров, Б. Г.

doi:10.1016/s0370-2693(98)00036-7

Cited by 20 publications

(39 citation statements)

References 18 publications

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“…Their variety reflects the problem of the interplay of soft and hard QCD in diffraction, as well as the interplay of leading and non leading twist effects. The latter have been pretty much ignored in the region of small x, however they may turn out to play an important role (Bartels and Wüsthoff, 1997;Bertini, Genovese, Nikolaev, Pronyaev and Zakharov, 1998) and improve our understanding of the small-x physics in general.…”

Section: Discussionmentioning

confidence: 99%

HERA collider physics

1999

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HERA, the first electron-proton collider, has been delivering luminosity since 1992. It is the natural extension of an impressive series of fixed-target leptonnucleon scattering experiments. The increase of a factor ten in center-of-mass energy over that available for fixed-target experiments has allowed the discovery of several important results, such as the large number of slow partons in the proton, and the sizeable diffractive cross section at large Q 2 . Recent data point to a possible deviation from Standard Model expectations at very high Q 2 , highlighting the physics potential of HERA for new effects. The HERA program is currently in a transition period. The first six years of data taking have primarily elucidated the structure of the proton, allowed detailed QCD studies and had a strong impact on the understanding of QCD dynamics. The coming years will bring the era of electroweak studies and high Q 2 measurements. This is therefore an appropriate juncture at which to review HERA results.

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Section: Discussionmentioning

confidence: 99%

HERA collider physics

1999

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“…Such a nonperturbative component of DGSF would have certain high-κ 2 tail which should not extend too far. The desired suppression of soft DGSF at large-κ 2 and of hard DGSF (41) at moderate and small κ 2 can be achieved by the extrapolation of the form suggested in [5,6] …”

Section: The Ansatz For Differential Gluon Structure Functionmentioning

confidence: 99%

“…6 Properties of differential gluon structure function in the momentum space 6.1 Soft/hard decomposition of DGSF Now we focus on the x and κ 2 behavior of the so-determined DGSF starting for the reference with the D-GRV parameterization. The same pattern holds for DGSF based on CTEQ and MRS DGLAP inputs, see below.…”

Section: Real Photoabsorption Cross Section σ γPmentioning

confidence: 99%

“…For instance, it is precisely DGSF of the target proton which emerges in the familiar color dipole picture of inclusive DIS at small x [3] and diffractive DIS into dijets [4]. Another familiar example is the QCD calculation of helicity amplitudes of diffractive DIS into continuum [5,6] and production of vector mesons [7,8]. DGSF's are custom-tailored for QCD treatment of hard processes, when one needs to keep track of the transverse momentum of gluons neglected in the standard collinear approximation [9].…”

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confidence: 99%

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Anatomy of the differential gluon structure function of the proton from the experimental data onF2p(x,Q2)

2002

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The use of the differential gluon structure function of the proton F(x, Q 2 ) introduced by Fadin, Kuraev and Lipatov in 1975 is called upon in many applications of small-x QCD. We report here the first determination of F(x, Q 2 ) from the experimental data on the small-x proton structure function F 2p (x, Q 2 ). We give convenient parameterizations for F(x, Q 2 ) based partly on the available DGLAP evolution fits (GRV, CTEQ & MRS) to parton distribution functions and on realistic extrapolations into soft region. We discuss an impact of soft gluons on various observables. The x-dependence of the so-determined F(x, Q 2 ) varies strongly with Q 2 and does not exhibit simple Regge properties. None the less the hard-to-soft diffusion is found to give rise to a viable approximation of the proton structure function F 2p (x, Q 2 ) by the soft and hard Regge components with intercepts ∆ sof t = 0 and ∆

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“…The kinematical variables are shown in fig. 1, quark and antiquark carry a fraction z and 1 − z of the photon's momentum and In our calculation of SCHNC σ D LT which is a new result of this work we rely heavily upon the theory of the schannel helicity conserving (SCHC) DDIS developed in [1,4,9,10]. Extension [11] of this formalism to the ∆ = 0…”

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confidence: 99%