651 research outputs found
A Grid architectural approach applied for backward compatibility to a production system for events simulation.
No full textDistributed systems paradigm gained in popularity during the last 15 years, thanks also to the broad diffusion of distributed frameworks proposed for the Internet plat form. In the late ’90s a new concept started to play a main role in the field of distributed computing: the Grid.
This thesis presents a study related to the integration between the BaBar’s framework, an experiment belonging to the High Energy Physics field, and a grid system like the one implemented by the Italian National Institute for Nuclear Physics (INFN), the INFNGrid project, which provides
support for several research domains. The main goal was to succeed in adapt an already well established system, like the one implemented into the BaBar pipeline and based on local centers not interconnected between themselves, to a kind of technology that was not ready by the time the
experiment’s framework was designed. Despite this new approach was related just to some aspects of the experiment, the production of simulated events by using MonteCarlo methods, the efforts here described represent an example of how an old experiment can bridge the gap toward the Grid computing, even adopting solutions designed for more recent projects.
The complete evolution of this integration will be explained starting from the earlier stages until the
actual development to state the progresses achieved, presenting results that are comparable with
production rates gained using the conventional BaBar’s approach, in order to examine the potentially benefits and drawbacks on a concrete case study
Determination of the longitudinal and the transverse part in electroproduction
No full textWe report on an experiment where the different contributions from the transverse and longitudinal polarization of the virtual photon are measured separately for the reaction e − p→e − π + n. The data taken above the resonance region at small ∣ t ∣ values in the q 2 range of ∣ q 2 ∣ < 0.5 GeV 2 show a clear dominance of the longitudinal part of the cross section and are well described by a generalized Born-term model. Using this model the electromagnetic form factor of the pion is determined. At q 2 = −0.35 GeV 2 one gets F π = 0.598 ± 0.021
Evidence for higher twist effects in fast π- production by antineutrinos in neon
No full textEvidence for a significant higher twist contribution to high z π- production in antineutrino scattering is presented. In events with W>3 GeV and Q2>1 GeV2 in our data, it accounts for (51 ±8)% of all π- with z above 0.5. It is consistent with the z-Q2 correlations of Berger's higher twist prediction. The data are inconclusive concerning the predicted y-z correlation and pT dependence. The z -Q2 correlation is not adequately described by the Lund Monte-Carlo. © 1986 Springer-Verlag
Test results from a uranium hadron calorimeter using wire chamber readout
No full textA uranium gas sampling calorimeter has been tested with electrons and pions between 1 and 50 GeV. A comparative evaluation of the response and the resolution for proportional and streamer mode operation of the gas wire chamber detectors is given for two different gas mixtures.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/26795/1/0000351.pd
STUDY OF mu e EVENTS PRODUCED IN ANTI-NEUTRINOS INTERACTIONS
No full textA study is presented of μe events from an exposure of BEBC, filed with an heavy H2/Ne mixture, to a wide band antineutrino beam at the CERN SPS. The prompt μ+e- rate, based on the observation of 45 events with pμ>4 GeV/c and pe>0.8 GeV/c, is found to be 0.31±0.05±0.02%, in agreement with previous determinations made on much smaller statistics. The differential kinematical variables characterizing the events and the content of strange particles are as expected for the production of charmed hadrons which subsequently decay semi-leptonically. An upper limit of 2.0±10-4 at 90% C.L. is given for the production rate of prompt μ+e+ events. No evidence is found for a significant production of Beauty hadrons. © 1984 Springer-Verlag.0SCOPUS: ar.jinfo:eu-repo/semantics/publishe
Inclusive Lambda production in two-photon collisions at LEP
No full textThe reactions e(+)e(-) --\u3e e(+)e(-) LambdaX and e(+)e(-) --\u3e e(+)e(-) LambdaX are studied using data collected at LEP with the L3 detector at centre-of-mass energies between 189 and 209 GeV. Inclusive differential cross sections are measured as a function of the lambda transverse momentum, p(t), and pseudo-rapidity, eta, in the ranges 0.4 GeV \u3c p(t) \u3c 2.5 GeV and \eta\ \u3c 1.2. The data are compared to Monte Carlo predictions. The differential cross section as a function of pt is well described by an exponential of the form A exp(-p(t) /). (C) 2004 Published by Elsevier B.V
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