CMS B physics reach Ciulli, V.
European physical journal. C, Particles and fields,
07/2004, Letnik:
34, Številka:
S1
Journal Article
Recenzirano
Odprti dostop
AbstractAt the design luminosity of 1034 cm–2 s–1, about 106\(\ensuremath{\mathrm{b}\bar{\mathrm{b}}}\) pairs are expected to be produced every second at the Large Hadron Collider. With such huge ...statistics and the precise tracking of the CMS detector B mesons can be investigated for CP violation, \(\ensuremath{\mathrm{B^{0}_{s}\mbox{-}\bar{B}^{0}_{s}}}\) mixing and rare decays. The trigger, however, cannot retain all \(\ensuremath{\mathrm{b}\bar{\mathrm{b}}}\) events for a later selection of exclusive B decays. A dedicated trigger strategy, which uses tracking immediately after the first trigger stage, is presented and results on few important benchmark channels are given.
The CMS silicon strip tracker operation in the cosmic run at 4T Ciulli, V.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2010, Letnik:
617, Številka:
1-3
Journal Article
Animal burrows in a river's earthen levee leads to water piping phenomena causing structural damage and eventual collapse during floods. Currently, the state of the art comprises case studies that ...deal with management and maintenance, while very few documents attempt at assessing possible animal-induced failure mechanisms. For the latter, detection and characterisation of the animal burrows is crucial and Electrical Resistivity Tomography (ERT) and Ground Penetrating Radar are the most employed geophysical techniques. Between 2017 and 2018 a team of physicists, engineering geologists, and geophysicists has for the first time probed the possibility of exploiting the Muon Transmission Radiography (MTR) to verify the internal conservation status of levees that were visibly damaged by animal activities. The technique is a non-invasive method, currently under development, based on the detection of muons, a highly penetrating component of atmospheric cosmic rays. MTR is capable of providing angular maps of the average density of the material present in front of the detector. A test site measurement campaign was carried out with a prototype instrument placed at the side of the levee. This new survey methodology was compared to a more traditional ERT measurement, performed with a pole-dipole and dipole-dipole configuration. Moreover, the actual burrows' distribution was mapped during the demolition works using Terrestrial Laser Scanner measurements to validate and constrain results. The comparison between ERT and MTR maps shows that, in spite of some limitations, the latter is a suitable and promising technique that could successfully complement a program of geological risk assessment.
•Exploiting Muon Transmission Radiography to verify the levees conservation status•Validation of Muon Transmission Radiography by means of geoelectrical measurements•Animal burrows reconstruction by means of Muon Radiography, ERT, and TLS
Volcanoes in Italy and the role of muon radiography D’Alessandro, Raffaello; Ambrosino, F.; Baccani, G. ...
Philosophical transactions of the Royal Society of London. Series A: Mathematical, physical, and engineering sciences,
01/2019, Letnik:
377, Številka:
2137
Journal Article
Recenzirano
Cosmic-ray muon radiography (muography), an imaging technique that can provide measurements of rock densities within the top few 100 m of a volcanic cone, has now achieved a spatial resolution of the ...order of 10 m in optimal detection conditions. Muography provides images of the top region of a volcano edifice with a resolution that is considerably better than that typically achieved with other conventional methods (i.e. gravimetric). We expect such precise measurements, to provide us with information on anomalies in the rock density distribution, which can be affected by dense lava conduits, low-density magma supply paths or the compression with the depth of the overlying soil. The MUon RAdiography of VESuvius (MURAVES) project is now in its final phase of construction and deployment. Up to four muon hodoscopes, each with a surface of roughly 1 m², will be installed on the slope of Vesuvius and take data for at least 12 months. We will use the muographic profiles, combined with data from gravimetric and seismic measurement campaigns, to determine the stratigraphy of the lava plug at the bottom of the Vesuvius crater, in order to infer potential eruption pathways. While the MURAVES project unfolds, others are using emulsion detectors on Stromboli to study the lava conduits at the top of the volcano. These measurements are ongoing: they have completed two measurement campaigns and are now performing the first data analysis.
This article is part of the Theo Murphy meeting issue ‘Cosmic-ray muography’.
A novel algorithm developed within muon radiography to localize objects or cavities hidden inside large material volumes was recently proposed by some of the authors (Bonechi et al. 2015 J. Instrum. ...10, P02003 (doi:10.1088/1748-0221/10/02/P02003)). The algorithm, based on muon back projection, helps to estimate the three-dimensional position and the transverse extension of detected objects without the need for measurements from different points of view, which would be required to make a triangulation. This algorithm can now be tested owing to the availability of real data collected both in laboratory tests and from real-world measurements. The methodology and some test results are presented in this paper.
This article is part of the Theo Murphy meeting issue ‘Cosmic-ray muography’.
The Tracker detector took data with cosmics rays at the Tracker Integration Facility (TIF) at CERN. First on-line monitoring tasks were executed at the Tracker Analysis Centre (TAC) which is a ...dedicated Control Room at TIF with limited computing resources. A set of software agents were developed to perform the real-time data conversion in a standard format, to archive data on tape at CERN and to publish them in the official CMS data bookkeeping systems. According to the CMS computing and analysis model, most of the subsequent data processing has to be done in remote Tier-1 and Tier-2 sites, so data were automatically transferred from CERN to the sites interested to analyze them, currently Fermilab, Bari and Pisa. Official reconstruction in the distributed environment was triggered in real-time by using the tool currently used for the processing of simulated events. Automatic end-user analysis of data was performed in a distributed environment, in order to derive the distributions of important physics variables. The tracker data processing is currently migrating to the Tier-0 CERN as a prototype for the global data taking chain. Tracker data were also registered into the most recent version of the data bookkeeping system, DBS-2, by profiting from the new features to handle real data. A description of the dataflow/workflow and of the tools developed is given, together with the results about the performance of the real-time chain. Almost 7.2 million events were officially registered, moved, reconstructed and analyzed in remote sites by using the distributed environment.
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