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Determination of the Integrated Luminosity at HERA using Elastic QED Compton Events
(2012)The European Physical Journal CA measurement of the integrated luminosity at the ep collider HERA is presented, exploiting the elastic QED Compton process ep→eγp. The electron and the photon are detected in the backward calorimeter of the H1 experiment. The integrated luminosity of the data recorded in 2003 to 2007 is determined with a precision of 2.3 %. The measurement is found to be compatible with the corresponding result obtained using the Bethe–Heitler process.Journal Article -
Measurement of beauty photoproduction near threshold using di-electron events with the H1 detector at HERA
(2012)The European Physical Journal CThe cross section for ep→ebb¯X in photoproduction is measured with the H1 detector at the ep-collider HERA. The decay channel bb¯→eeX′ is selected by identifying the semi-electronic decays of the b-quarks. The total production cross section is measured in the kinematic range given by the photon virtuality Q 2≤1 GeV2, the inelasticity 0.05≤y≤0.65 and the pseudorapidity of the b-quarks |η(b)|,|η(b¯)|≤2. The differential production cross ...Journal Article -
Combined inclusive diffractive cross sections measured with forward proton spectrometers in deep inelastic ep scattering at HERA
(2012)The European Physical Journal CA combination of the inclusive diffractive cross section measurements made by the H1 and ZEUS Collaborations at HERA is presented. The analysis uses samples of diffractive deep inelastic ep scattering data at a centre-of-mass energy s√=318 GeV where leading protons are detected by dedicated spectrometers. Correlations of systematic uncertainties are taken into account, resulting in an improved precision of the cross section measurement ...Journal Article -
Inclusive deep inelastic scattering at high Q(2) with longitudinally polarised lepton beams at HERA
(2012)Journal of High Energy PhysicsInclusive e ± p single and double differential cross sections for neutral and charged current deep inelastic scattering processes are measured with the H1 detector at HERA. The data were taken at a centre-of-mass energy of s√=319 GeV with a total integrated luminosity of 333.7 pb−1 shared between two lepton beam charges and two longitudinal lepton polarisation modes. The differential cross sections are measured in the range of negative ...Journal Article -
Inclusive measurement of diffractive deep-inelastic scattering at HERA
(2012)The European Physical Journal CThe diffractive process ep→eXY, where Y denotes a proton or its low mass excitation with M Y <1.6 GeV, is studied with the H1 experiment at HERA. The analysis is restricted to the phase space region of the photon virtuality 3 ≤ Q 2 ≤ 1600 GeV2, the square of the four-momentum transfer at the proton vertex |t|< 1.0 GeV2 and the longitudinal momentum fraction of the incident proton carried by the colourless exchange x ℙ<0.05. \printtha ...Journal Article -
Measurement of beauty and charm photoproduction using semi-muonic decays in dijet events at HERA
(2012)The European Physical Journal CMeasurements of cross sections for beauty and charm events with dijets and a muon in the photoproduction regime at HERA are presented. The data were collected with the H1 detector and correspond to an integrated luminosity of 179 pb−1. Events with dijets of transverse momentum Pjet1T>7 GeV and Pjet2T>6 GeV in the pseudorapidity range −1.5<η jet<2.5 in the laboratory frame are selected in the kinematic region of photon virtuality Q 2<2.5 ...Journal Article -
Measurement of inclusive and dijet D* meson cross sections in photoproduction at HERA
(2012)The European Physical Journal CThe inclusive photoproduction of D ∗ mesons and of D ∗-tagged dijets is investigated with the H1 detector at the ep collider HERA. The kinematic region covers small photon virtualities Q 2<2 GeV2 and photon–proton centre-of-mass energies of 100<W γp <285 GeV. Inclusive D ∗ meson differential cross sections are measured for central rapidities |η(D ∗)|<1.5 and transverse momenta p T (D ∗)>1.8 GeV. The heavy quark production process is further ...Journal Article -
Measurement of dijet production in diffractive deep-inelastic scattering with a leading proton at HERA
(2012)The European Physical Journal CThe cross section of diffractive deep-inelastic scattering ep→eXp is measured, where the system X contains at least two jets and the leading final state proton is detected in the H1 Forward Proton Spectrometer. The measurement is performed for fractional proton longitudinal momentum loss x ℙ<0.1 and covers the range 0.1<|t|<0.7 GeV2 in squared four-momentum transfer at the proton vertex and 4<Q 2<110 GeV2 in photon virtuality. The ...Journal Article -
Measurement of the azimuthal correlation between the most forward jet and the scattered positron in deep-inelastic scattering at HERA
(2012)The European Physical Journal CDeep-inelastic positron-proton scattering events at low photon virtuality, Q 2, with a forward jet, produced at small angles with respect to the proton beam, are measured with the H1 detector at HERA. A subsample of events with an additional jet in the central region is also studied. For both samples, differential cross sections and normalised distributions are measured as a function of the azimuthal angle difference, Δϕ, between the ...Journal Article -
Measurement of the diffractive longitudinal structure function F(L)(D) at HERA
(2011)The European Physical Journal CFirst measurements are presented of the diffractive cross section σ ep→eXY at centre-of-mass energies s√ of 225 and 252GeV, together with a precise new measurement at s√ of 319GeV, using data taken with the H1 detector in the years 2006 and 2007. Together with previous H1 data at s√ of 301GeV, the measurements are used to extract the diffractive longitudinal structure function FDL in the range of photon virtualities 4.0≤Q2≤44.0GeV2 and ...Journal Article