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Forward jet production in deep inelastic scattering at HERA
(2006)The European Physical Journal CThe production of forward jets has been measured in deep inelastic ep collisions at HERA. The results are presented in terms of single differential cross sections as a function of the Bjorken scaling variable (x Bj ) and as triple differential cross sections d 3σ/dx Bj dQ 2 dp2t,jet, where Q 2 is the four momentum transfer squared and p2t,jet is the squared transverse momentum of the forward jet. Also cross sections for events with a ...Journal Article -
Diffractive deep-inelastic scattering with a leading proton at HERA
(2006)The European Physical Journal CThe cross section for the diffractive deep-inelastic scattering process ep→eXp is measured, with the leading final state proton detected in the H1 Forward Proton Spectrometer. The data analysed cover the range xIP<0.1 in fractional proton longitudinal momentum loss, 0.08<|t|<0.5 GeV-2 in squared four-momentum transfer at the proton vertex, 2<Q2<50 GeV2 in photon virtuality and 0.004<β=x/xIP<1, where x is the Bjorken scaling variable. For ...Journal Article -
Measurement of charm and beauty dijet cross sections in photoproduction at HERA using the H1 vertex detector
(2006)The European Physical Journal CA measurement of charm and beauty dijet photoproduction cross sections at the ep collider HERA is presented. Events are selected with two or more jets of transverse momentum pt jet1(2)>11(8) GeV in the central range of pseudo-rapidity -0.9<ηjet1(2)<1.3. The fractions of events containing charm and beauty quarks are determined using a method based on the impact parameter, in the transverse plane, of tracks to the primary vertex, as measured ...Journal Article -
Search for baryonic resonances decaying to Ξπ in deep-inelastic scattering at HERA
(2007)The European Physical Journal CA search for narrow baryonic resonances decaying into Ξ-π- or Ξ-π+ and their antiparticles is carried out with the H1 detector using deep inelastic scattering events at HERA in the range of negative photon four-momentum transfer squared 2 < Q2 < 100 GeV2. No signal is observed for a new baryonic state in the mass range 1600–2300 MeV in either the doubly charged or the neutral decay channels. The known Ξ(1530)0 is observed through its decay ...Journal Article -
Measurement of deeply virtual Compton scattering at HERA
(2005)The European Physical Journal CA measurement is presented of elastic deeply virtual Compton scattering γ∗p→\ensuremathγp made using e + p collision data corresponding to a luminosity of 46.5 pb-1, taken with the H1 detector at HERA. The cross section is measured as a function of the photon virtuality, Q 2, the invariant mass of the p system, W, and for the first time, differentially in the squared momentum transfer at the proton vertex, t, in the kinematic range ...Journal Article -
Measurement of dijet production at low Q(2) at HERA
(2004)The European Physical Journal CTriple differential dijet cross sections in e±p interactions are presented in the region of photon virtualities 2 < Q 2 < 80 GeV2, inelasticities 0.1 < y < 0.85, jet transverse energies E * T 1 > 7 GeV, E * T 2 > 5 GeV, and pseudorapidities −2.5<η∗1,η∗2<0. The measurements are made in the γ∗p centre-of-mass frame, using an integrated luminosity of 57 pb-1. The data are compared with NLO QCD calculations and LO Monte Carlo programs with ...Journal Article -
Measurement of charm and beauty photoproduction at HERA using D*mu correlations
(2005)Physics Letters B ~ Physics letters. BA measurement of charm and beauty photoproduction at the electron proton collider HERA is presented based on the simultaneous detection of a D*± meson and a muon. The correlation between the D* meson and the muon serves to separate the charm and beauty contributions and the analysis provides comparable sensitivity to both. The total and differential experimental cross sections are compared to LO and NLO QCD calculations. The measured charm ...Journal Article -
A direct search for stable magnetic monopoles produced in positron-proton collisions at HERA
(2005)The European Physical Journal CA direct search has been made for magnetic monopoles produced in e + p collisions at a centre of mass energy of 300 GeV at HERA. The beam pipe surrounding the interaction region in 1995-1997 was investigated using a SQUID magnetometer to look for stopped magnetic monopoles. During this time an integrated luminosity of 62 pb-1 was delivered. No magnetic monopoles were observed and charge and mass dependent upper limits on the e + p production ...Journal Article -
Measurement of anti-deuteron photoproduction and a search for heavy stable charged particles at HERA
(2004)The European Physical Journal CThe cross section for anti-deuteron photoproduction is measured at HERA at a mean centre-of-mass energy of Wγp=200 GeV in the range 0.2 < p T /M < 0.7 and |y| < 0.4, where M, p T and y are the mass, transverse momentum and rapidity of the anti-deuteron in the HERA laboratory frame, respectively. The numbers of anti-deuterons per event are found to be similar in photoproduction to those in central proton-proton collisions at the CERN ISR ...Journal Article -
Forward π◦ production and associated transverse energy flow in deep-inelastic scattering at HERA
(2004)The European Physical Journal CJournal Article