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Observation of the hadronic final state charge asymmetry in high Q2 deep-inelastic scattering at HERA
(2009)Physics Letters BA first measurement is presented of the charge asymmetry in the hadronic final state from the hard interaction in deep-inelastic ep neutral current scattering at HERA. The measurement is performed in the range of negative squared four momentum transfer 100 < Q 2 < 8000 GeV 2. The difference between the event normalised distributions of the scaled momentum, x p, for positively and negatively charged particles, measured in the current region ...Journal Article -
Inclusive photoproduction of ρ0, K*0 and ϕ mesons at HERA
(2009)Physics Letters BInclusive non-diffractive photoproduction of ρ (770) 0, K * (892) 0 and φ{symbol} (1020) mesons is investigated with the H1 detector in ep collisions at HERA. The corresponding average γp centre-of-mass energy is 210 GeV. The mesons are measured in the transverse momentum range 0.5 < p T < 7 GeV and the rapidity range | y lab | < 1. Differential cross sections are presented as a function of transverse momentum and rapidity, and are compared ...Journal Article