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Published Articles

2021-05-07
08:51
 Towards Realistic Implementations of Large Imaging Calorimeters / Emberger, Lorenz Konrad (Munich, Max Planck Inst.) /CALICE Collaboration The next generation of collider detectors will most likely make full use of Particle Flow algorithms, requiring precision tracking and imaging calorimeters. The latter, with granularity 2 to 3 orders of magnitude above existing devices, have been developed during the last 15 years by the CALICE collaboration and are now approaching maturity. [...] SISSA, 2019 - 5 p. - Published in : PoS EPS-HEP2019 (2020) 178 Fulltext: PDF; In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.178

2021-05-07
08:51
 Study of the Effects of Radiation at the CERN Gamma Irradiation Facility on the CMS Drift Tubes Muon Detector for the HL-LHC on the CMS DT for the HL-LHC / Gonzalez Fernandez, Juan Rodrigo (Oviedo U.) ; Group, On Behalf Of The Cms Muon /CMS Muon Collaboration The CMS drift tubes (DT) muon detector, built for standing up the LHC expected integrated and instantaneous luminosities, will be used also in the High Luminosity LHC (HL-LHC) at a 5 times larger instantaneous luminosity and, consequently, much higher levels of radiation, reaching about 10 times the LHC integrated luminosity. Initial irradiation tests of a spare DT chamber at the CERN gamma irradiation facility (GIF++), at large (~O(100)) acceleration factor, showed aging effects resulting in a degradation of the DT cell performance; however, full CMS simulations have shown almost no impact in the muon reconstruction efficiency over the full barrel acceptance and for the full integrated luminosity. [...] SISSA, 2019 - 5 p. - Published in : PoS EPS-HEP2019 (2020) 173 Fulltext: PDF; In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.173

2021-05-07
08:51
 The Micromegas chambers for the upgrade of the forward muon detector of ATLAS / Samarati, Jerome (CERN) /ATLAS Muon Collaboration The ATLAS Collaboration at the LHC has chosen the resistive Micromegas technology, along with the small-strip Thin Gap Chambers, for the high luminosity upgrade of the first muon station in the high-η region (i.e.1.3 < |η| < 2.7), the so called New Small Wheel project. After the R&D; phase, design and prototyping phase, the first series production Micromegas quadruplets are being constructed at the involved construction sites (France, Germany, Italy, Russia and Greece). [...] SISSA, 2019 - 6 p. - Published in : PoS EPS-HEP2019 (2020) 171 Fulltext: PDF; In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.171

2021-05-07
08:51
 CMS Run 2 High Level Trigger Performance / Sert, Hale (Aachen, Tech. Hochsch.) /CMS Collaboration The Compact Muon Solenoid (CMS) experiment selects events with a two-level trigger system, the Level-1 (L1) trigger and the High Level trigger (HLT). The HLT is a farm of approximately 30K CPU cores that reduces the rate from 100 kHz to about 1 kHz. [...] SISSA, 2019 - 5 p. - Published in : PoS EPS-HEP2019 (2020) 165 Fulltext: PDF; In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.165

2021-05-07
08:51
 Studies of RPC detector operation with eco-friendly gas mixtures under irradiation at the CERN Gamma Irradiation Facility / Rigoletti, Gianluca (Lyon U.) ; Aielli, Giulio (Rome U., Tor Vergata) ; Alberghi, Gian Luigi (INFN, Bologna) ; Benussi, Luigi (Frascati) ; Bianchi, Antonio (INFN, Turin ; Turin U.) ; Bianco, Stefano (Frascati) ; Stante, Luigi Di (Rome U., Tor Vergata) ; Boscherini, Davide (INFN, Bologna) ; Bruni, Alessia (INFN, Bologna) ; Camarri, Paolo (Rome U.) et al. Resistive Plate Chamber (RPC) detectors are widely used at the CERN LHC experiments as muon trigger thanks to their excellent time resolution. They are operated with a Freon-based gas mixture containing $C_2 H_2 F_4$ and $SF_6$, both greenhouse gases (GHG) with a very high global warming potential (GWP).The search of new environmentally friendly gas mixtures is necessary to reduce GHG emissions and costs as well as to optimize RPC performance.Several recently available gases with low GWP have been identified as possible replacements for $C_2 H_2 F_4$ and $SF_6$.In particular, eco-friendly gas mixtures based on the HFO-1234ze have been investigated on 1.4 and 2 mm single-gap and double-gap RPCs.The RPC detectors have been tested at the CERN Gamma Irradiation Facility (GIF++), which provides a high energy muon beam combined with an intense gamma source allowing to simulate the background expected at HL-LHC.The performance of RPCs were studied at different gamma rates with the new environmentally friendly gases by measuring ohmic and physics currents, fluorine radicals and HF production, rate capability and induced charge.Preliminary results on the long-term effects on the performance of the detectors are presented in this study.. SISSA, 2020 - 7 p. - Published in : PoS EPS-HEP2019 (2020) 164 Fulltext: PDF; In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.164

2021-05-07
08:51
 Optimising the performance of the CMS Electromagnetic Calorimeter to measure Higgs properties during Phase I and Phase II of the LHC / Valsecchi, Davide (Milan Bicocca U. ; CERN) /CMS Collaboration The CMS Electromagnetic Calorimeter (ECAL), is a high granularity lead tungstate crystal calorimeter operating at the CERN LHC. The original design placed a premium on excellent energy resolution. [...] SISSA, 2019 - 6 p. - Published in : PoS EPS-HEP2019 (2020) 161 Fulltext: PDF; In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.161

2021-05-07
08:51
 Progress in the Development of Fast Timing Micro-Pattern Gaseous Detector / Roskas, Christos (Gent U.) ; De Oliveira, Rui (CERN) ; Maggi, Marcello (INFN, Pavia) ; Verwilligen, Piet (INFN, Bari) ; Vai, Ilaria (INFN, Pavia ; Pavia U.) ; Tytgat, Michael (Gent U.) Advances in the photo-lithographic techniques during the last twenty years have led to the development of micro-pattern gaseous detectors (MPGD). Their main features include high rate capability and radiation hardness, excellent spatial resolution, good time resolution, reduced radiation length and possible flexible geometries. [...] SISSA, 2020 - 6 p. - Published in : PoS EPS-HEP2019 (2020) 158 Fulltext: PDF; In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.158

2021-05-07
08:51
 Upgrades of the CMS muon detectors: from Run 3 towards HL-LHC / Battilana, Carlo (INFN, Bologna ; U. Bologna, DIFA) /CMS Collaboration The present CMS muon system consists of three different detector technologies: drift tubes (DT) and cathode strip chambers (CSC) are used in the barrel and endcap regions of the spectrometer as offline tracking and triggering devices, whereas resistive plate chambers (RPC) are installed both in barrel and endcaps and are exploited mostly in the trigger. To cope with the challenging conditions of increasing luminosity expected at HL-LHC, several upgrades of the muon detectors and trigger system are planned. [...] SISSA, 2019 - 5 p. - Published in : PoS EPS-HEP2019 (2020) 156 Fulltext : PDF; In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.156

2021-05-07
08:51
 Muon performance with CMS detector in Run-2 of LHC / Battilana, Carlo (INFN, Bologna ; U. Bologna, DIFA) /CMS Collaboration The Compact Muon Solenoid (CMS) detector is one of the two multi-purpose experiments at the Large Hadron Collider (LHC) and has a broad physics program. Many aspects of this program depend on our ability to trigger, reconstruction, and identify events with final state muons in a wide range of momenta, from a few GeV to the TeV scale.In this talk, we present the full reconstruction procedure for both offline and online muons used in CMS. [...] SISSA, 2019 - 5 p. - Published in : PoS EPS-HEP2019 (2020) 155 Fulltext: PDF; In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.155

2021-05-07
08:51
 Real-time alignment and temperature dependency of the LHCb Vertex Detector / Mitreska, Biljana (Manchester U.) /LHCb Collaboration The accuracy of the LHCb Vertex Locator (VELO) position has ensured excellent detector performance, with a track reconstruction efficiency above 98\%, and a vertex resolution along the beam axis of about 70 $\mu$m. The real-time alignment and calibration procedure developed by the LHCb experiment for Run 2 (2015-2018) for the full detector, including the VELO, provided extremely stable conditions during the full data taking period. [...] SISSA, 2019 - 5 p. - Published in : PoS EPS-HEP2019 (2020) 154 Fulltext: PDF; In : European Physical Society Conference on High Energy Physics (EPS-HEP) 2019, Ghent, Belgium, 10 - 17 Jul 2019, pp.154

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