par Adloff, Catherine;Clerbaux, Barbara 
;Collard, Caroline ;Favart, Laurent ;Janssen, Xavier ;Marage, Pierre ; [et al.]
Référence European Physical Journal C. Particles and Fields, 20, 1, page (29-49)
Publication Publié, 2001
;Collard, Caroline ;Favart, Laurent ;Janssen, Xavier ;Marage, Pierre ; [et al.]Référence European Physical Journal C. Particles and Fields, 20, 1, page (29-49)
Publication Publié, 2001
Article révisé par les pairs
| Résumé : | A measurement is presented of dijet and 3-jet cross sections in low-t diffractive deep-inelastic scattering interactions of the type ep → eXY, where the system X is separated by a large rapidity gap from a low-mass baryonic system Y. Data taken with the H1 detector at HERA, corresponding to an integrated luminosity of 18.0 pb-1, are used to measure hadron level single and double differential cross sections for 4 < Q2 < 80 GeV2, cursive Greek chiℙ < 0.05 and pΤ,jet > 4 GeV. The energy flow not attributed to jets is also investigated. The measurements are consistent with a factorising diffractive exchange with trajectory intercept close to 1.2 and tightly constrain the dominating diffractive gluon distribution. Viewed in terms of the diffractive scattering of partonic fluctuations of the photon, the data require the dominance of qq̄g over qq̄ states. Soft colour neutralisation models in their present form cannot simultaneously reproduce the shapes and the normalisations of the differential cross sections. Models based on 2-gluon exchange are able to reproduce the shapes of the cross sections at low cursive Greek chiℙ values. |
