The hadronic part of the electron structure function F2e has been measured for the first time, using e+e− data collected by the DELPHI experiment at LEP, at centre-of-mass energies of ...s=91.2–209.5 GeV. The data analysis is simpler than that of the measurement of the photon structure function. The electron structure function F2e data are compared to predictions of phenomenological models based on the photon structure function. It is shown that the contribution of large target photon virtualities is significant. The data presented can serve as a cross-check of the photon structure function F2γ analyses and help in refining existing parameterisations.
A search for pair-produced doubly charged Higgs bosons has been performed using the data collected by the DELPHI detector at LEP at centre-of-mass energies between 189 and 209 GeV. No excess is ...observed in the data with respect to the Standard Model background. A lower limit for the mass of 97.3 GeV/c2 at the 95% confidence level has been set for doubly charged Higgs bosons in left–right symmetric models for any value of the Yukawa coupling between the Higgs bosons and the τ leptons.
El presente artículo se inserta en el contexto de la calidad de la democracia, como uno de los nuevos focos de estudio de la ciencia política. Se hacen algunas reflexiones teóricas sobre los ...conceptos de democracia y calidad. Así mismo, se busca determinar cuáles son las variables que deben considerarse para el estudio de la calidad de la democracia. Para cumplir dicho objetivo, en la segunda parte los autores reconstruyen dos importantes índices que, habitualmente, se utilizan para evaluar la calidad de la democracia.
Architecture and performance of the DELPHI trigger system Bocci, V; Booth, P.S.L; Bozzo, M ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
08/1995, Letnik:
362, Številka:
2
Journal Article
Recenzirano
Odprti dostop
This paper describes the trigger system of the DELPHI detector at LEP. It reports on the most relevant aspects of the hardware and shows the software strategies that have been developed to optimize ...its use.
In 1993 the structure of the trigger in four decision levels has become fully operational and data collected during this period have been used to study the trigger performance. Various final state channels such as
μ
+
μ
−, e
+e
− and
hadronic events were selected and their trigger efficiencies were calculated as a function of the polar angle θ. The results obtained indicate that, for any of the event topologies considered, the DELPHI trigger efficiency is independent of the θ angle, and, furthermore, the attained efficiency values are determined to be very close to 100% within an extremely good precision. This is a consequence of the high redundancy presently provided by all the DELPHI subdetectors. In addition to this analysis, events containing isolated particles either in the barrel or in the forward regions have been selected to evaluate the trigger response to single particles. Hence, trigger efficiencies for single particles have also been computed for charged tracks as a function of the momentum and for photons as a function of the deposited electromagnetic energy.
El presente artículo se inserta en el contexto de la calidad de la democracia, como uno de los nuevos focos de estudio de la ciencia política. Se hacen algunas reflexiones teóricas sobre los ...conceptos de democracia y calidad. Así mismo, se busca determinar cuáles son las variables que deben considerarse para el estudio de la calidad de la democracia. Para cumplir dicho objetivo, en la segunda parte los autores reconstruyen dos importantes índices que, habitualmente, se utilizan para evaluar la calidad de la democracia.
RPC cosmic ray tests in the ATLAS experiment Chiodini, G.; Aielli, G.; Aloisio, A. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
10/2007, Letnik:
581, Številka:
1
Journal Article
Recenzirano
Extensive tests with cosmic rays were performed with Resistive Plate Chamber (RPC) trigger chambers belonging to 6 muon stations of sector 13 installed in the ATLAS muon spectrometer. We illustrate ...the results of this pre-commissioning phase, which represents a test bench for the final commissioning of the ATLAS RPC system with cosmic rays.
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