Energy Flow in the Hadronic Final State of Diffractive and Non-Diffractive Deep-Inelastic Scattering at HERA

An investigation of the hadronic final state in diffractive and non--diffractive deep--inelastic electron--proton scattering at HERA is presented, where diffractive data are selected experimentally by demanding a large gap in pseudo --rapidity around the proton remnant direction. The transverse energy flow in the hadronic final state is evaluated using a set of estimators which quantify topological properties. Using available Monte Carlo QCD calculations, it is demonstrated that the final state in diffractive DIS exhibits the features expected if the interaction is interpreted as the scattering of an electron off a current quark with associated effects of perturbative QCD. A model in which deep--inelastic diffraction is taken to be the exchange of a pomeron with partonic structure is found to reproduce the measurements well. Models for deep--inelastic $ep$ scattering, in which a sizeable diffractive contribution is present because of non--perturbative effects in the production of the hadronic final state, reproduce the general tendencies of the data but in all give a worse description.Comment: 22 pages, latex, 6 Figures appended as uuencoded fil

A Search for Selectrons and Squarks at HERA

Data from electron-proton collisions at a center-of-mass energy of 300 GeV are used for a search for selectrons and squarks within the framework of the minimal supersymmetric model. The decays of selectrons and squarks into the lightest supersymmetric particle lead to final states with an electron and hadrons accompanied by large missing energy and transverse momentum. No signal is found and new bounds on the existence of these particles are derived. At 95% confidence level the excluded region extends to 65 GeV for selectron and squark masses, and to 40 GeV for the mass of the lightest supersymmetric particle.Comment: 13 pages, latex, 6 Figure

Jets and energy flow in photon-proton collisions at HERA

Properties of the hadronic final state in photoproduction events with large transverse energy are studied at the electron-proton collider HERA. Distributions of the transverse energy, jets and underlying event energy are compared to \overline{p}p data and QCD calculations. The comparisons show that the \gamma p events can be consistently described by QCD models including -- in addition to the primary hard scattering process -- interactions between the two beam remnants. The differential jet cross sections d\sigma/dE_T^{jet} and d\sigma/d\eta^{jet} are measured

Разработка интерактивной моделирующей системы технологии низкотемпературной сепарации газа

We present a study of J ψ meson production in collisions of 26.7 GeV electrons with 820 GeV protons, performed with the H1-detector at the HERA collider at DESY. The J ψ mesons are detected via their leptonic decays both to electrons and muons. Requiring exactly two particles in the detector, a cross section of σ(ep → J ψ X) = (8.8±2.0±2.2) nb is determined for 30 GeV ≤ W γp ≤ 180 GeV and Q 2 ≲ 4 GeV 2 . Using the flux of quasi-real photons with Q 2 ≲ 4 GeV 2 , a total production cross section of σ ( γp → J / ψX ) = (56±13±14) nb is derived at an average W γp =90 GeV. The distribution of the squared momentum transfer t from the proton to the J ψ can be fitted using an exponential exp(− b ∥ t ∥) below a ∥ t ∥ of 0.75 GeV 2 yielding a slope parameter of b = (4.7±1.9) GeV −2

A Measurement of the Proton Structure Function F ⁣2(x,Q2)F_{\!2}(x,Q^2)

A measurement of the proton structure function $F_{\!2}(x,Q^2)$ is reported for momentum transfer squared $Q^2$ between 4.5 $GeV^2$ and 1600 $GeV^2$ and for Bjorken $x$ between $1.8\cdot10^{-4}$ and 0.13 using data collected by the HERA experiment H1 in 1993. It is observed that $F_{\!2}$ increases significantly with decreasing $x$, confirming our previous measurement made with one tenth of the data available in this analysis. The $Q^2$ dependence is approximately logarithmic over the full kinematic range covered. The subsample of deep inelastic events with a large pseudo-rapidity gap in the hadronic energy flow close to the proton remnant is used to measure the "diffractive" contribution to $F_{\!2}$.Comment: 32 pages, ps, appended as compressed, uuencoded fil

Abbildung medizinischer Gerätedaten von ISO/IEEE 11073-10207 nach HL7 FHIR

The ISO/IEEE 11073-10207 Domain Information and Service Model focuses on cross-manufacturer device-to-device communication, whereas HL7 Fast Healthcare Interoperability Resources (FHIR) support the data exchange between software systems in health care. The contents of both standards overlap, yet they differ in structure. In this work, we present an Implementation Guide that contains a mapping of medical device data from ISO/IEEE 11073-10207 to HL7 FHIR in order to improve vendor-independent interoperability. This Implementation Guide helps to bridge the structural interoperability gap between these two communication architectures for medical devices and clinical information systems. This furthermore promotes the reuse of medical device data, e.g. for clinical research purposes.To facilitate the mapping while retaining contextual information despite the structural differences, it was only necessary to create five profiles for two FHIR resources. This Implementation Guide is described in relation to similar efforts including difficulties that arose during the implementation of the mapping. Approximately 25 problems occurred, but in all cases they are not critical and most of them could be solved for our use cases. In the future, this work will be merged with the Implementation Guide for point-of-care medical devices.Das ISO/IEEE 11073-10207 Domain Information and Service Model konzentriert sich auf die herstellerübergreifende Device-to-Device-Kommunikation, während HL7 Fast Healthcare Interoperability Resources (FHIR) den Datenaustausch zwischen Softwaresystemen im Gesundheitswesen unterstützt. Beide Standards überschneiden sich inhaltlich, unterscheiden sich jedoch in ihrer Struktur. In dieser Arbeit stellen wir einen Implementation Guide vor, der die Abbildung medizinischer Gerätedaten von ISO/IEEE 11073-10207 nach HL7 FHIR enthält, um die herstellerunabhängige Interoperabilität zu verbessern. Dieser Implementation Guide hilft bei der Überbrückung der strukturellen Interoperabilitätslücke zwischen diesen beiden Kommunikationsarchitekturen für Medizinprodukte und klinische Informationssysteme. Darüber hinaus fördert er die Sekundärnutzung medizinischer Gerätedaten, z.B. für klinische Forschungszwecke.Um die Abbildung zu erleichtern und gleichzeitig trotz der strukturellen Unterschiede die Kontextinformationen zu erhalten, war es lediglich notwendig, fünf Profile für zwei FHIR-Ressourcen zu erstellen. Dieser Implementation Guide wird in Bezug gesetzt zu ähnlichen Bemühungen einschließlich der Schwierigkeiten, die bei der Implementierung des Mappings aufgetreten sind. Es traten etwa 25 Probleme auf, die aber in allen Fällen nicht kritisch sind. Für unsere Anwendungsfälle konnte überwiegend eine Lösung erarbeitet werden. Die hier vorgestellten Lösungen werden in Zukunft mit dem Implementation Guide für Point-of-Care-Medizingeräte zusammengeführt