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Elastic J/ψ production at HERA
(2006)The European Physical Journal CCross sections for elastic production of J/ψ mesons in photoproduction and electroproduction are measured in electron proton collisions at HERA using an integrated luminosity of 55 pb-1. Results are presented for photon virtualities Q2 up to 80 GeV2. The dependence on the photon-proton centre of mass energy Wγp is analysed in the range 40≤Wγp≤305 GeV in photoproduction and 40≤Wγp≤160 GeV in electroproduction. The Wγp dependences of the ...Journal Article -
Measurement of event shape variables in deep-inelastic scattering at HERA
(2006)The European Physical Journal CDeep-inelastic ep scattering data taken with the H1 detector at HERA and corresponding to an integrated luminosity of 106 pb-1 are used to study the differential distributions of event shape variables. These include thrust, jet broadening, jet mass and the C-parameter. The four-momentum transfer Q is taken to be the relevant energy scale and ranges between 14 GeV and 200 GeV. The event shape distributions are compared with perturbative ...Journal Article -
Measurement of F2c[`(c)]F2ccˉ and F2b[`(b)]F2bbˉ at low Q2 and x * using the H1 vertex detector at HERA
(2006)The European Physical Journal CMeasurements are presented of inclusive charm and beauty cross sections in e +p collisions at HERA for values of photon virtuality 12 ≤ Q2 ≤ 60 GeV2 and of the Bjorken scaling variable 0.0002 x ≤ 0.005. 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 by the H1 vertex detector. Values for the structure ...Journal Article -
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 -
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 a narrow baryonic resonance decaying to Ks0 p or Ks0 over(p, ̄) in deep inelastic scattering at HERA
(2006)Physics Letters BA search for a narrow baryonic resonance decaying to Ks0 p or Ks0 over(p, ̄) is carried out in deep inelastic ep scattering with the H1 detector at HERA. Such a resonance could be a strange pentaquark Θ+, evidence for which has been reported by several experiments. The Ks0 p and Ks0 over(p, ̄) invariant mass distributions presented here do not show any significant peak in the mass range from threshold up to 1.7 GeV. Mass dependent upper ...Journal Article -
Search for doubly-charged Higgs boson production at HERA
(2006)Physics Letters BA search for the single production of doubly-charged Higgs bosons H± ± in ep collisions is presented. The signal is searched for via the Higgs decays into a high mass pair of same charge leptons, one of them being an electron. The analysis uses up to 118 pb-1 of ep data collected by the H1 experiment at HERA. No evidence for doubly-charged Higgs production is observed and mass dependent upper limits are derived on the Yukawa couplings he ...Journal Article -
A determination of electroweak parameters at HERA
(2006)Physics Letters BUsing the deep inelastic e+p and e-p charged and neutral current scattering cross sections previously published, a combined electroweak and QCD analysis is performed to determine electroweak parameters accounting for their correlation with parton distributions. The data used have been collected by the H1 experiment in 1994-2000 and correspond to an integrated luminosity of 117.2 pb-1. A measurement is obtained of the W propagator mass in ...Journal Article -
First measurement of charged current cross sections at HERA with longitudinally polarised positrons
(2006)Physics Letters BJournal Article -
Tau lepton production in ep collisions at HERA
(2006)The European Physical Journal CJournal Article