[en] This report reviews methods of pattern recognition and event reconstruction used in modern high energy physics experiments. After a brief introduction into general concepts of particle detectors and statistical evaluation, different approaches in global and local methods of track pattern recognition are reviewed with their typical strengths and shortcomings. The emphasis is then moved to methods which estimate the particle properties from the signals which pattern recognition has associated. Finally, the global reconstruction of the event is briefly addressed. (orig.)

[en] In this thesis the production of meson and baryon resonances as leading particles in jets was studied. The results of the data analysis were interpreted on the base of the quark-parton model using the Feynman field algorithm. The form of the P_T dependence of the ratio ρ/π and the relation of K^O*/K⁺ and anti K^O*/K^- agree well with the model predictions. A distinct spin supression is observed. For the fragmentation the values (V/P)_u,d = 1.66±0.18±0.63 as well as (V/P)_s = 0.90±0.13±0.27. The ratio ρ/π was measured at three different polar angles. The angular dependence is consistent with QCD model calculations. By means of the ρ production also the ratio π⁺/π^- can be determined indirectly at the polar angles 10⁰ and 20⁰. The expected increase with the rapidity is found which indicates the increasing dominance of the u-quark structure function at large Bjorken x. For the f₂(1270) tensor meson at θ=10⁰ a ratio f₂(1270)/ρ^O = 0.30±0.08 was determined. At θ=45⁰ a distinct Δ⁺⁺ signal was observed. Δ⁺⁺/p = 0.93±0.19. (orig./HSI)

[en] A strategy for pattern recognition in the main tracking system of a forward B spectrometer like HERA-B or LHC-B is presented. Intrinsically a local method, it combines the virtues of track following procedures with the necessary ability to optimize between many available paths in a high occupancy environment. A hit-locating procedure suitable for a multiplanar detector geometry has been developed. The performance of the method is tested on HERA-B Monte Carlo events with full detector simulation and a realistic spectrometer geometry. (orig.)

[en] The reconstruction of beauty hadrons in pN interactions, generated by suspending a wire target in the halo of the HERA proton beam, will have to be performed online, in tune with the HERA-B data acquisition. The challenges imposed by the huge track density and data rate, the solutions which have been developed, their performance tested on simulated data and a concept for a scalable processor farm are presented. (orig.)

[en] This report reviews methods of pattern recognition and event reconstruction used in modern high energy physics experiments. After a brief introduction to general concepts about particle detectors and statistical evaluation, different approaches in global and local methods of track pattern recognition are reviewed with their typical strengths and shortcomings. The emphasis is then shifted to methods which estimate the particle properties from those signals which pattern recognition has associated. Finally, the global reconstruction of the event is briefly addressed

No abstract available

[en] The detector and collider upgrades for HERA-II have considerably increased the demand on computing resources for Monte Carlo production for the ZEUS experiment. In order to close the gap, the existing production system was extended to be able to use Grid resources as well. This integrated system has been successfully in production since November 2004. A total of 275 million events have been simulated by thirty different Grid sites within eight months exceeding the capacity of the old system. We present the production setup and introduce the toolkit that has been developed by ZEUS for efficient use of the existing Grid middleware

[en] In this paper measurements are presented of short range three-particle rapidity correlations in pp interactions at c.m. energies √ s = 31, 44 and 62 GeV. The data were obtained at the CERN Intersecting Storage Rings (ISR) using the split Field Magnet Detector (SFM) with a minimum bias trigger. Three-particle short range rapidity correlations are observed for the (-+-) and (+-+) combinations; no short-range rapidity correlation is observed for the (---) and (+++) configurations. The rapidity range of the three-particle correlations is approximately the same as for the two-particle correlations

[en] The CMS CERN Analysis Facility (CAF) was primarily designed to host a large variety of latency-critical workflows. These break down into alignment and calibration, detector commissioning and diagnosis, and high-interest physics analysis requiring fast-turnaround. In addition to the low latency requirement on the batch farm, another mandatory condition is the efficient access to the RAW detector data stored at the CERN Tier-0 facility. The CMS CAF also foresees resources for interactive login by a large number of CMS collaborators located at CERN, as an entry point for their day-by-day analysis. These resources will run on a separate partition in order to protect the high-priority use-cases described above. While the CMS CAF represents only a modest fraction of the overall CMS resources on the WLCG GRID, an appropriately sized user-support service needs to be provided. We will describe the building, commissioning and operation of the CMS CAF during the year 2008. The facility was heavily and routinely used by almost 250 users during multiple commissioning and data challenge periods. It reached a CPU capacity of 1.4MSI2K and a disk capacity at the Peta byte scale. In particular, we will focus on the performances in terms of networking, disk access and job efficiency and extrapolate prospects for the upcoming LHC first year data taking. We will also present the experience gained and the limitations observed in operating such a large facility, in which well controlled workflows are combined with more chaotic type analysis by a large number of physicists.

[en] In order to extend the tracking acceptance, to improve the primary and secondary vertex reconstruction and thus enhancing the tagging capabilities for short lived particles, the ZEUS experiment at the HERA Collider at DESY installed a silicon strip vertex detector. The barrel part of the detector is a 63 cm long cylinder with silicon sensors arranged around an elliptical beampipe. The forward part consists of four circular shaped disks. In total just over 200k channels are read out using 2.9m² of silicon. In this report a detailed overview of the design and construction of the detector is given and the performance of the completed system is reviewed