443 research outputs found

    Search for new physics with the SHiP experiment at CERN

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    SHiP is a new general purpose fixed target experiment at the CERN SPS designed to complement LHC experiments in the search for new physics. In its initial phase, the 400400 GeV proton beam extracted from the SPS will be dumped on a heavy target with the aim of integrating 2×10202\times10^{20} pot in 5 years. Shielded by an active muon shield, a dedicated detector, based on a long decay volume followed by a spectrometer and particle identification detectors, will allow probing a variety of models with light long-lived exotic particles with masses below O(10)  GeV/c2\mathcal{O}(10)\; \mathrm{GeV}/{c^2}. The main focus will be the physics of the so-called Hidden Portals, i.e. search for Dark Photons, Light scalars and pseudo-scalars, and Heavy Neutral Leptons. The sensitivity to Heavy Neutral Leptons will allow for the first time to probe, in the mass range above the kaon mass, a coupling range for which Baryogenesis and active neutrino masses could also be explained. A dedicated emulsion-based detector will allow detection of light dark matter in an unexplored parameter range.Comment: 6 pages, 3 figures, to appear in the Proceedings of the EPS Conference on High Energy Physics (EPS-HEP), Venice, July 2017; v2: as accepted for publication, rephrased section 3.3 in response to reviewer comment

    The DUNE vertical drift TPC

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    The DUNE experiment is a future long-baseline neutrino oscillation experiment aiming at measuring the neutrino CP-violating phase and establishing the neutrino mass hierarchy, as well as at a rich physics programme from supernovae over low-energy physics to beyond Standard Model searches. The baseline technology for the first far detector is a proven single-phase horizontal-drift liquid-Argon TPC based on standard wire-chamber technology. For the second far detector, a new technology, the so-called "vertical drift" TPC is currently being developed: It aims at combining the strengths of the two technologies tested in the ProtoDUNE cryostats at the CERN neutrino platform, the proven horizontal-drift single-phase TPC and the ambitious vertical-drift dual-phase TPC, into a single design, a vertical-drift single-phase liquid-Argon TPC using a novel perforated-PCB anode design. This design maintains excellent tracking and calorimetry performance while significantly simplifying the complexity of the TPC construction. This paper introduces the concept of the vertical drift TPC, presents first results from small-scale prototypes and a first full-scale anode module, and outlines the plans for future prototypes and the next steps towards the full second DUNE far detector.Comment: 6 pages, 5 figures. Submitted as proceedings for ICHEP22; v2: fix some typos and minor grammar mistakes for final versio

    Optimisation of the SHiP experimental design

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    The SHiP experiment is a proposed experiment aiming to search for new super-weakly interacting particles. The concept is based on using a very intense and high energy proton beam at the CERN Super Proton Synchrotron (SPS) which is delivered to the new Beam Dump Facility (BDF), where the experiment will search for New Physics (NP) in a zero background environment. This thesis describes several studies for the optimisation of this concept, in order to maximise its physics potential. These include studies of a benchmark signal model to understand acceptance effects, studies of the muon induced background using both simulation and a dedicated experiment at the SPS, and the optimisation of the muon shield —a crucial component of SHiP— using machine learning techniques.Open Acces

    Optimisation of the SHiP experimental design

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    The SHiP experiment is a proposed experiment aiming to search for new super-weakly interacting particles. The concept is based on using a very intense and high energy proton beam at the CERN Super Proton Synchrotron (SPS) which is delivered to the new Beam Dump Facility (BDF), where the experiment will search for New Physics (NP) in a zero background environment. This thesis describes several studies for the optimisation of this concept, in order to maximise its physics potential. These include studies of a benchmark signal model to understand acceptance effects, studies of the muon induced background using both simulation and a dedicated experiment at the SPS, and the optimisation of the muon shield —a crucial component of SHiP— using machine learning techniques

    The DUNE vertical drift TPC

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    International audienceThe DUNE experiment is a future long-baseline neutrino oscillation experiment aiming at mea-suring the neutrino CP-violating phase and establishing the neutrino mass hierarchy, as well as ata rich physics programme from supernovae over low-energy physics to beyond Standard Modelsearches.The baseline technology for the ïŹrst far detector is a proven single-phase horizontal-drift liquid-Argon TPC based on standard wire-chamber technology.For the second far detector, a new technology, the so-called “vertical drift” TPC is currently beingdeveloped: It aims at combining the strengths of the two technologies tested in the ProtoDUNEcryostats at the CERN neutrino platform, the proven horizontal-drift single-phase TPC and the ambi-tious vertical-drift dual-phase TPC, into a single design, a vertical-drift single-phase liquid-ArgonTPC using a novel perforated-PCB anode design. This design maintains excellent tracking andcalorimetry performance while signiïŹcantly simplifying the complexity of the TPC construction.This paper introduces the concept of the vertical drift TPC, presents ïŹrst results from small-scaleprototypes and a ïŹrst full-scale anode module, and outlines the plans for future prototypes and thenext steps towards the full second DUNE far detector

    The DUNE vertical drift TPC

    No full text
    International audienceThe DUNE experiment is a future long-baseline neutrino oscillation experiment aiming at mea-suring the neutrino CP-violating phase and establishing the neutrino mass hierarchy, as well as ata rich physics programme from supernovae over low-energy physics to beyond Standard Modelsearches.The baseline technology for the ïŹrst far detector is a proven single-phase horizontal-drift liquid-Argon TPC based on standard wire-chamber technology.For the second far detector, a new technology, the so-called “vertical drift” TPC is currently beingdeveloped: It aims at combining the strengths of the two technologies tested in the ProtoDUNEcryostats at the CERN neutrino platform, the proven horizontal-drift single-phase TPC and the ambi-tious vertical-drift dual-phase TPC, into a single design, a vertical-drift single-phase liquid-ArgonTPC using a novel perforated-PCB anode design. This design maintains excellent tracking andcalorimetry performance while signiïŹcantly simplifying the complexity of the TPC construction.This paper introduces the concept of the vertical drift TPC, presents ïŹrst results from small-scaleprototypes and a ïŹrst full-scale anode module, and outlines the plans for future prototypes and thenext steps towards the full second DUNE far detector

    Searches at the lhc including faser

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    Alignment of the muon-flux spectrometer in FairShip using the survey measurements

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    This note describes the alignment of the muon-flux spectrometer using the survey data and its implementation in FairShip

    Measurement of the muon flux for the SHiP experiment

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    We report the results of the measurement of the muon flux emanating from the SHiP target at the CERN SPS. A replica of the SHiP target followed by a 2.4 m2.4~\rm{m} iron hadron absorber was installed in the H4 400 GeV/c proton beamline. To measure the momentum spectrum, a spectrometer consisting of drift tubes and resistive plate chambers (RPCs) was placed around the Goliath magnet. During a three week period a dataset for analysis corresponding to 3.27×10113.27 \times 10^{11} protons on target (POT) was recorded. This amounts to approximatively 1%1\% of a SHiP spill. The amount of accumulated data allows us to make a validation of the results from our Pythia and Geant4 based Monte Carlo (FairShip)

    The LHCb upgrade I

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    International audienceThe LHCb upgrade represents a major change of the experiment. The detectors have been almost completely renewed to allow running at an instantaneous luminosity five times larger than that of the previous running periods. Readout of all detectors into an all-software trigger is central to the new design, facilitating the reconstruction of events at the maximum LHC interaction rate, and their selection in real time. The experiment's tracking system has been completely upgraded with a new pixel vertex detector, a silicon tracker upstream of the dipole magnet and three scintillating fibre tracking stations downstream of the magnet. The whole photon detection system of the RICH detectors has been renewed and the readout electronics of the calorimeter and muon systems have been fully overhauled. The first stage of the all-software trigger is implemented on a GPU farm. The output of the trigger provides a combination of totally reconstructed physics objects, such as tracks and vertices, ready for final analysis, and of entire events which need further offline reprocessing. This scheme required a complete revision of the computing model and rewriting of the experiment's software
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