Phenomenology of diffractive DIS

Николаев, Н. Н.; Захаров, Б. Г.

doi:10.1063/1.53619

Cited by 22 publications

(34 citation statements)

References 23 publications

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“…Color dipole interactions Since in small-x interactions it is rather the qq fluctuation of the photon which interacts with the target proton, it is natural to view the interaction as that of a color dipole with the proton (Nikolaev and Zakharov, 1994;Nikolaev and Zakharov, 1997;Wüsthoff, 1997b;Bia las and Peschanski, 1996). Bia las and Peschanski (1996) have extended the dipole approach assuming that the proton also consists of color dipoles.…”

Section: Qcd Inspired Models Of Lrg Productionmentioning

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: Qcd Inspired Models Of Lrg Productionmentioning

confidence: 99%

HERA collider physics

1999

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“…Such a suppression of the cross section is usually attributed to rescattering, or absorptive corrections [87][88][89][90], which are Table 10 Cross section of elastic ρ 0 photoproduction on the pion, γ π + → ρ 0 π + , extracted in the one-pion-exchange approximation using three different samples: full sample, OPE1 and OPE2. The first uncertainty represents the full experimental error and the second is the model error coming from the pion flux uncertainty (see text).…”

Section: γ π Cross Sectionmentioning

confidence: 99%

Exclusive $\rho^0$ Meson Photoproduction with a Leading Neutron at HERA

Levonian¹

2016

Proceedings of XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2016)

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A first measurement is presented of exclusive photoproduction of ρ 0 mesons associated with leading neutrons at HERA. The data were taken with the H1 detector in the years 2006 and 2007 at a centre-of-mass energy of √ s = 319 GeV and correspond to an integrated luminosity of 1.16 pb −1 . The ρ 0 mesons with transverse momenta p T < 1 GeV are reconstructed from their decays to charged pions, while leading neutrons carrying a large fraction of the incoming proton momentum, x L > 0.35, are detected in the Forward Neutron Calorimeter. The phase space of the measurement is defined by the photon virtuality Q 2 < 2 GeV 2 , the total energy of the photon-proton system 20 < W γ p < 100 GeV and the polar angle of the leading neutron θ n < 0.75 mrad. The cross section of the reaction γ p → ρ 0 nπ + is mea- † Deceased a e-mail: sschmitt@mail. Sciences, sured as a function of several variables. The data are interpreted in terms of a double peripheral process, involving pion exchange at the proton vertex followed by elastic photoproduction of a ρ 0 meson on the virtual pion. In the framework of one-pion-exchange dominance the elastic cross section of photon-pion scattering, σ el (γ π + → ρ 0 π + ), is extracted. The value of this cross section indicates significant absorptive corrections for the exclusive reaction γ p → ρ 0 nπ + .

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“…Since,however, fixed-x L fits, by construction, represent the best parametrisations of the data and Eqs. (18)(19)(20) are interpreted as a mere interpolating tool, we require that the accuracy of the x L -combined fit does not exceeds the one of the fixed-x L fits. We found that a conservative χ 2 = 9 criterion matches these requirements, as shown in Fig.…”

Section: Error Estimation and Propagationmentioning

confidence: 99%

“…An intensive physics program with forward neutron tagging has been pursued at HERA as well, where recent results [14,15] show that around 8 % of the DIS events contain a forward neutron. These data are crucial in testing the limiting fragmentation hypothesis [16] and have been used as benchmark in a number of Regge-based models [17][18][19][20][21][22][23] which mainly concentrate on the modelisation of forward neutron production mechanisms. In the present paper we adopt instead a complementary approach and no modelisation of neutron production mechanisms is attempted.…”

Section: Introductionmentioning

confidence: 99%