1,678 research outputs found

    Process and Data Flow Control in KLOE

    Get PDF
    Abstract The core of the KLOE distributed event building system is a switched network. The online processes are distributed over a large set of processors in this network. All processes have to change coherently their state of activity as a consequence of local or remote commands. A fast and reliable message system based on the SNMP protocol has been developed. A command server has been implemented as a non privileged daemon able to respond to "set" and "get" queries on private SNMP variables. This process is able to convert remote set operations into local commands and to map automatically an SNMP subtree on a user-defined set of process variables. Process activity can be continuously monitored by remotely accessing their variables by means of the command server. Only the command server is involved in these operations, without disturbing the process flow. Subevents coming from subdetectors are sent to different nodes of a computing farm for the last stage of event building. Based on features of the SNMP protocol and of the KLOE message system, the Data Flow Control System (DFC) is able to rapidly redirect network traffic, keeping in account the dynamics of the whole DAQ system in order to assure coherent subevent addressing in an asynchronous "push" architecture, without introducing dead time. The KLOE DFC is currently working in the KLOE DAQ system. Its main characteristics and performance are discussed

    STUDY OF THE NEUTRAL DECAYS OF THE KL FOR THE CP VIOLATION MEASUREMENT AT KLOE

    Get PDF
    2000/2001XIV Ciclo1972Versione digitalizzata della tesi di dottorato cartacea

    Oscilacije Bs0

    Get PDF
    For a long time, the B0 s -B¬Į0 s system has eluded a complete investigation of its observables. Only recently, the Tevatron experiments have accumulated sizable B0 s samples which allow a direct and precise study of the system properties. This contribution reviews the most up-to-date measurements by the CDF and D√ė Collaborations of the B0 s -B¬Į0 s system parameters: the mass and decay-width differences, ‚ąÜms and ‚ąÜőďs between the heavy and light B0 s mass eigenstates, the average decay width őďs and the CP-violating phase in the mixing ŌÜs.Dugo je vremena sustav B0 s -B¬Į0 s bio nedokuńćiv potpunim istraŇĺivanjima svojih fizińćkih velińćina. Tek su nedavna mjerenja na Tevatronu sakupila poveńáe uzorke B0 s koji omoguńáuju izravno i tońćno prouńćavanje svojstava tog sustava. Ovdje se daje pregled najnovijih mjerenja parametara sustava B0 s -B¬Į0 s koja su obavila suradnje D√ė i CDF: razlike masa i Ň°irina raspada teŇ°kog i lakog svojstvenog stanja B0 s , ‚ąÜms i ‚ąÜőďs, prosjeńćne Ň°irine raspada, őďs i faze mijeŇ°anja koja krŇ°i CP, ŌÜs

    Preliminary Report on the Study of Beam-Induced Background Effects at a Muon Collider

    Full text link
    Physics at a multi-TeV muon collider needs a change of perspective for the detector design due to the large amount of background induced by muon beam decays. Preliminary studies, based on simulated data, on the composition and the characteristics of the particles originated from the muon decays and reaching the detectors are presented here. The reconstruction performance of the physics processes H‚ÜíbbňČH\to b\bar b and Z‚ÜíbbňČZ\to b\bar b has been investigated for the time being without the effect of the machine induced background. A preliminary study of the environment hazard due to the radiation induced by neutrino interactions with the matter is presented using the FLUKA simulation program

    Charged Particle Tracking in Real-Time Using a Full-Mesh Data Delivery Architecture and Associative Memory Techniques

    Full text link
    We present a flexible and scalable approach to address the challenges of charged particle track reconstruction in real-time event filters (Level-1 triggers) in collider physics experiments. The method described here is based on a full-mesh architecture for data distribution and relies on the Associative Memory approach to implement a pattern recognition algorithm that quickly identifies and organizes hits associated to trajectories of particles originating from particle collisions. We describe a successful implementation of a demonstration system composed of several innovative hardware and algorithmic elements. The implementation of a full-size system relies on the assumption that an Associative Memory device with the sufficient pattern density becomes available in the future, either through a dedicated ASIC or a modern FPGA. We demonstrate excellent performance in terms of track reconstruction efficiency, purity, momentum resolution, and processing time measured with data from a simulated LHC-like tracking detector

    Towards a muon collider

    Get PDF
    A muon collider would enable the big jump ahead in energy reach that is needed for a fruitful exploration of fundamental interactions. The challenges of producing muon collisions at high luminosity and 10 TeV centre of mass energy are being investigated by the recently-formed International Muon Collider Collaboration. This Review summarises the status and the recent advances on muon colliders design, physics and detector studies. The aim is to provide a global perspective of the field and to outline directions for future work

    Combined Forward-Backward Asymmetry Measurements in Top-Antitop Quark Production at the Tevatron

    Get PDF
    The CDF and D0 experiments at the Fermilab Tevatron have measured the asymmetry between yields of forward- and backward-produced top and antitop quarks based on their rapidity difference and the asymmetry between their decay leptons. These measurements use the full data sets collected in proton-antiproton collisions at a center-of-mass energy of s=1.96\sqrt s =1.96 TeV. We report the results of combinations of the inclusive asymmetries and their differential dependencies on relevant kinematic quantities. The combined inclusive asymmetry is AFBttňČ=0.128¬Ī0.025A_{\mathrm{FB}}^{t\bar{t}} = 0.128 \pm 0.025. The combined inclusive and differential asymmetries are consistent with recent standard model predictions

    Differential cross section measurements for the production of a W boson in association with jets in proton‚Äďproton collisions at ‚ąös = 7 TeV

    Get PDF
    Measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse momenta (pT) and pseudorapidities of the four leading jets, the scalar sum of jet transverse momenta (HT), and the difference in azimuthal angle between the directions of each jet and the muon. The data sample of pp collisions at a centre-of-mass energy of 7 TeV was collected with the CMS detector at the LHC and corresponds to an integrated luminosity of 5.0 fb[superscript ‚ąí1]. The measured cross sections are compared to predictions from Monte Carlo generators, MadGraph + pythia and sherpa, and to next-to-leading-order calculations from BlackHat + sherpa. The differential cross sections are found to be in agreement with the predictions, apart from the pT distributions of the leading jets at high pT values, the distributions of the HT at high-HT and low jet multiplicity, and the distribution of the difference in azimuthal angle between the leading jet and the muon at low values.United States. Dept. of EnergyNational Science Foundation (U.S.)Alfred P. Sloan Foundatio

    Penilaian Kinerja Keuangan Koperasi di Kabupaten Pelalawan