R. Graciani

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Grid computing was developed to provide users with uniform access to large-scale distributed resources. This has worked well, however there are significant resources available to the scientific community that do not follow this paradigm those on cloud infrastructure providers, HPC supercomputers or local clusters. DIRAC (Distributed Infrastructure with(More)
The LHCb grid software has been used for two Physics Data Challenges, the most recent of which will have produced 90 TB of data and required over 400 processor-years of computing power. This paper discusses the group’s experience with developing Grid Services, interfacing to the LCG, running LHCb experiment software on the grid, and the integration of a(More)
Jet photoproduction, where the two highest transverse energy (E T ) jets have E jet T above 6 GeV and a jet-jet invariant mass above 23 GeV, has been studied with the ZEUS detector at the HERA ep collider. Resolved and direct photoproduction samples have been separated. The cross section as a function of the angle between the jet-jet axis and the beam(More)
Andrea Bulgarelli*, Valentina Fioretti, Andrea Zoli, Alessio Aboudan, Juan José RodríguezVázquez, Gernot Maier, Etienne Lyard, Denis Bastieri, Saverio Lombardi, Gino Tosti, Adriano De Rosa, Sonia Bergamaschi, Matteo Interlandi, Domenico Beneventano, Giovanni Lamanna, Jean Jacquemier, Karl Kosack, Lucio Angelo Antonelli, Catherine Boisson, Jerzy Borkowski,(More)
Differential cross sections for dijet photoproduction in association with a leading neutron using the reaction e+ + p → e+ + n + jet + jet +Xr have been measured with the ZEUS detector at HERA using an integrated luminosity of 6.4 pb−1. The fraction of dijet events with a leading neutron in the final state was studied as a function of the jet kinematic(More)
The expected rates for charm-tagged jet photoproduction are evaluated for a number of tagging procedures, and some of the physics potential is discussed. Charm in jets is tagged using D’s, μ’s, or tracks from secondary vertices which might be identified in a microvertex detector. We find high expected event rates, leading to the possibility of placing(More)
The precise calibration (at a level of below 1%) of the electromagnetic calorimeter (ECAL) of the LHCb experiment is an essential task for the fulfilment of the LHCb physics program. The final step of this task is performed with two calibration methods using the real data from the experimental setup. It is a very CPU-consuming procedure as both methods(More)
In deep inelastic neutral current scattering of positrons and protons at the center of mass energy of 300 GeV, we observe, with the ZEUS detector, events with a high energy neutron produced at very small scattering angles with respect to the proton direction. The events constitute a fixed fraction of the deep inelastic, neutral current event sample(More)
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