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- W2018644893 abstract "An analysis of diffractive deep-inelastic ep scattering at HERA is presented using data taken in 1994 with the H1 detector corresponding to an integrated luminosity of ∼2 pb−1. The cross section is measured in terms of a diffractive structure function F2D(3)(β,Q2,xP) of the proton over the kinematic range 2.5<Q2<65 GeV2, 0.01<β<0.9 and 0.0001<xP<0.05. The dependence of F2D(3) on xP is found not to depend on Q2 but to depend on β, demonstrating that the factorisation of the γ*p cross section into a universal diffractive flux (depending only on xP and t) and a single structure function (depending only on β and Q2) is not tenable. The data are consistent with an interpretation in which two individually factorisable components contribute to F2D(3). They may be identified with the exchange of pomeron (P) and meson (M) Regge trajectories with xP dependencies ∝xP−(2αP−1), xP−(2αM−1) with αP(0)=1.18±0.20(stat)±0.04(syst) and αM(0)=0.6±0.1(stat)±0.3(syst). The Q2 and β dependences of F2D(3) are examined by integrating F2D(3) over xP. For different β, violations of scale invariance are observed which are consistent with a substantial gluon component in diffractive exchange. When confronted with the leading order DGLAP evolution equations in perturbative QCD, the data yield first estimates of the partonic content of diffractive exchange which is dominated by a leading gluon at the starting scale of Q02=2.5 GeV2." @default.
- W2018644893 created "2016-06-24" @default.
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- W2018644893 modified "2023-09-23" @default.
- W2018644893 title "Measurement and interpretation of F2D(3)" @default.
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- W2018644893 doi "https://doi.org/10.1063/1.53713" @default.
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