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The elastic electroproduction of mesons is studied at HERA with the H1 detector for a photon virtuality in the range ½ É ¾ ¼ Î ¾ and for a hadronic centre of mass energy in the range ¿¼ Ï ½½¼ GeV. The shape of the () mass distribution in the resonance region is measured as a function of É ¾. The full set of spin density matrix elements is determined, and(More)
A search for events with an imbalance in transverse momentum and with isolated high energy leptons has been carried out at the positron-proton collider HERA. One event with an e ? and five events with a are found together with evidence for undetected particles carrying transverse momentum. Within the Standard Model the dominant origin of events with this(More)
Internal jet structure in dijet production in deep-inelastic scattering is measured with the H1 detector at HERA. Jets with transverse energies E T,Breit > 5 GeV are selected in the Breit frame employing k ⊥ and cone jet algorithms. In the kinematic region of squared momentum transfers 10 < Q 2 120 GeV 2 and x-Bjorken values 2 · 10 −4 x Bj 8 · 10 −3 , jet(More)
Deep–inelastic scattering events with a leading baryon have been detected by the H1 experiment at HERA using a forward proton spectrometer and a forward neutron calorimeter. Semi–inclusive cross sections have been measured in the kinematic region 2 Q 2 50 GeV 2 , 6 10 ?5 x 6 10 ?3 and baryon p T 200 MeV, for events with a final state proton with energy 580(More)
A thrust analysis of Large-Rapidity-Gap events in deep-inelastic ep collisions is presented , using data taken with the H1 detector at HERA in 1994. The average thrust of the nal states X, which emerge from the dissociation of virtual photons in the range 10 < Q 2 < 100 GeV 2 , grows with hadronic mass M X and implies a dominant 2-jet topology. Thrust is(More)
Measurements are presented of K 0 meson and baryon production in deep-inelastic positron-proton scattering (DIS) in the kinematic range 10 < Q 2 < 70 GeV 2 and 10 ?4 < x < 10 ?2. The measurements, obtained using the H1 detector at the HERA collider, are discussed in the light of possible mechanisms for increased strangeness production at low Bjorken-x.(More)
Deep-inelastic Ô scattering data, taken with the H1 detector at HERA, are used to study the event shape variables thrust, jet broadening, jet mass, parameter and two kinds of differential two-jet rate. The data cover a large range of the four-momentum transfer É, which is considered to be the relevant energy scale, between Î and ½¼¼ Î. The É dependences of(More)
A search for excited fermions ¢ ¡ of the first generation in £ ¤ ¦ ¥ scattering at the col-lider HERA is presented using H1 data with an integrated luminosity of 37 pb § ¨. All electroweak decays of excited fermions, © ¡ ¢ © ! are considered and all possible final states resulting from the ! or hadronic decays or decays into leptons of the first two(More)
(English) The number of online-sensors in dairy farming is increasing. In this manner, important biologically changes in cows as for example changes in secretion can be detected at an early stage. But high mechanical strains on the teat tissue during milking still occur frequently and can for example lead to formation of teat rings. A suboptimal adjusted(More)
The purpose of the study was to compare indoor and outdoor housing of pigs and their influence on animal health, growing performance and meat quality in a controlled field trial: 29 litters (252 piglets) from indoor and 22 litters (221 piglets) from outdoor were separated at weaning. One half of each litter changed to the opposite housing resulting finally(More)