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    • Several versions

    Lepton universality tests with leptonic kaon decays

    Lazzeroni, Cristina
    arXiv.org, Jan 30, 2011 [Peer Reviewed Journal]

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    The Run Control system of the NA62 experiment at CERN SPS

    Lazzeroni, Cristina, Lurkin, Nicolas
    arXiv.org, Aug 2, 2018
    © ProQuest LLC All rights reserved, Engineering Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest One Academic, Engineering Collection (ProQuest)
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    Title: The Run Control system of the NA62 experiment at CERN SPS
    Author: Lazzeroni, Cristina; Lurkin, Nicolas
    Contributor: Lurkin, Nicolas (pacrepositoryorg)
    Subject: Experiments ; CERN ; Knowledge Acquisition ; Stability ; Subsystems ; Synchrotrons
    Description: The NA62 experiment at CERN SPS started physics data taking this year with the aim to measure the ultra-rare decay \(K^+\to\pi^+\nu\bar{\nu}\). The experiment consists of a large number of subsystems to reach the goal of 10% accuracy and less than 10% background. The Run Control has been designed to link their trigger and data acquisition system in a single central application easily controllable by non-expert shifters. It has been continuously evolving over time, integrating new equipments, following new requirements and feedback from shifters. The next steps of development is a more automatized system that integrates the knowledge acquired during the operation of the experiment.
    Is part of: arXiv.org, Aug 2, 2018
    Identifier: 2331-8422 (E-ISSN)

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    The Run Control system of the NA62 experiment at CERN SPS

    Lazzeroni, Cristina, Lurkin, Nicolas
    PoS(ICHEP2016)911
    Cornell University
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    Title: The Run Control system of the NA62 experiment at CERN SPS
    Author: Lazzeroni, Cristina; Lurkin, Nicolas
    Subject: Physics - Instrumentation And Detectors
    Description: The NA62 experiment at CERN SPS started physics data taking this year with the aim to measure the ultra-rare decay $K^+\to\pi^+\nu\bar{\nu}$. The experiment consists of a large number of subsystems to reach the goal of 10% accuracy and less than 10% background. The Run Control has been designed to link their trigger and data acquisition system in a single central application easily controllable by non-expert shifters. It has been continuously evolving over time, integrating new equipments, following new requirements and feedback from shifters. The next steps of development is a more automatized system that integrates the knowledge acquired during the operation of the experiment. Comment: 4 pages, 0 figures, Poster presented at 38th International Conference on High Energy Physics, Chicago, 3-10 August 2016. arXiv admin note: substantial text overlap with arXiv:1701.07683
    Is part of: PoS(ICHEP2016)911
    Identifier: 1808.00962 (ARXIV ID)

    • Several versions

    New NA48 results on CP violation

    Lazzeroni, Cristina
    The European Physical Journal C - Particles and Fields, 2004, Vol.33, pp.s330-s332 [Peer Reviewed Journal]

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    Title: Kaon identification and Search for Lepton Number Violation in K\(^±\) decay-in-flight experiments at CERN
    Author: Massri, Karim
    Date: 2015
    Subject: Qc Physics
    Description: A search for the Lepton Number Violating decay \(K\)\(^±\) → \(π\)\(^∓\)\(μ\)\(^±\)\(μ\)\(^±\) has been performed using the data collected by the NA48/2 experiment in 2003 and 2004. The signal event selection, the background rejection, the evaluation of the muon identification efficiency and the statistical methods used for the data interpretation are presented. Based on 1.8 x 10\(^1\)\(^1\) kaon decays in the fiducial volume and using several models for the signal, upper limits for the branching ratio \(B\)(\(K\)\(^±\) → \(π\)\(^∓\)\(μ\)\(^±\)\(μ\)\(^±\)) of the order of 10\(^-\)\(^1\)\(^0\) have been obtained for 90%, 95% and 99% confidence levels, improving the previous best limit of one order of magnitude. The Cherenkov differential counter used for kaon identification in the NA62 experiment, equipped with approximately 30% of the photo-detectors, was installed and tested during a Technical Run in 2012. The counter's ability of distinguishing between kaons and pions has been validated via pressure scan procedure. The data collected have been used for evaluating the kaon efficiency and time resolution. The extrapolation to the full-sized detector has been also estimated.

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    Diffraction in ALICE and trigger efficiencies

    Navin, Sparsh
    University of Birmingham
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    Title: Diffraction in ALICE and trigger efficiencies
    Author: Navin, Sparsh
    Date: 2011
    Subject: Qc Physics
    Description: ALICE is built to measure the properties of strongly interacting matter created in heavy-ion collisions. In addition, taking advantage of the low pT acceptance in the central barrel, ALICE is playing an important role in understanding pp collisions with minimum bias triggers at LHC energies. The work presented in this thesis is based on pp data simulated by the ALICE collaboration and early data collected at a center-of-mass energy of 7 TeV. A procedure to calculate trigger efficiencies and an estimate of the systematic uncertainty due to the limited acceptance of the detector are shown. A kinematic comparison between Monte Carlo event generators, PYTHIA 6, PYTHIA 8 and PHOJET is also presented. To improve the description of diffraction in PYTHIA, a hard diffractive component was added to PYTHIA 8 in 2009, which is described. Finally a trigger with a high efficiency for picking diffractive events is used to select a sample with an enhanced diffractive component from pp data. These data are compared to Monte Carlo models, and the results are summarized with an estimate of the systematic uncertainty.

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    Title: Neutral pion transition form factor measurement and run control at the NA62 experiment
    Author: Lurkin, Nicolas
    Date: 2017
    Subject: Qc Physics
    Description: The measurement of the π0 electromagnetic transition form factor (TFF) slope a is performed in the time-like region of momentum transfer using a sample of 1.1 x 106 π0→ e+e-y Dalitz decay collected at the NA62-RK experiment in 2007. The event selection, the fit procedure and the study of the systematic effects are presented. The final result obtained a = (3.68 ± 0.51stat ± 0.25syst) X 10- 2 is the most precise to date and represents the first evidence of a non-zero π0 TFF slope with more than 3σ. The NA62 experiment based at the CERN SPS is currently taking data and aims at measuring the branching fraction of the K→ πvv ultra-rare decay with 10% precision and less than 10% background. A complex trigger and data acquisition system is in place to record the data collected by the various detectors in use to reach this goal. The Run Control system of the experiment is meant to supervise and control them in a simple transparent way. The choices made to address the requirements for the system and the most important aspects of its implementation are discussed.

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    Kaon identification and the search for heavy neutrinos at NA62

    Newson, Francis
    University of Birmingham
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    Title: Kaon identification and the search for heavy neutrinos at NA62
    Author: Newson, Francis
    Date: 2016
    Subject: Qc Physics
    Description: A search for heavy neutrinos in the decay K⁺→μ⁺\(_h\) has been performed using the data collected by the NA62-R\(_K\) experiment in 2007. The signal event selection is presented, along with an estimate of the expected background in the signal region, obtained by Monte Carlo simulation as well as data driven techniques. This estimate is supported by studies of the detector performance in muon identification efficiency and momentum resolution. Using a sample corresponding to 6x10\(^7\) kaon decays in the fiducial volume, limits of order 10\(^-\)\(^5\) have been set on the branching ratio, Br(K\(^+\)→μ\(^+\)ν\(_h\) ), for neutrino masses in the range 275 MeV/c\(^2\) – 375 MeV/c\(^2\), under the assumption that the heavy neutrino does not decay into visible particles inside the detector. In the range 330 MeV/c\(^2\) – 375 MeV/c\(^2\), there are no previous limits from peak searches. Over the rest of the range, the new limits do not improve upon existing results. Improved limits might come from the NA62 experiment designed to measure the branching ratio of the ultra rare kaon decay K+→π\(^+\)νν, which began taking data in 2015. Kaon identification is performed by a differential Cherenkov detector. The timing resolution of the photo-detectors was measured in a pilot run in 2014 and used to improve the simulation of the detector. An algorithm was developed to align the detector during live data taking, and this was used at the start of the 2015 run.

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    Title: Development of a software trigger algorithm for electron identification using the NA62 RICH Cherenkov detector
    Author: Fascianelli, Valeria
    Date: 2016
    Subject: Qa76 Computer Software ; Qc Physics
    Description: The thesis focuses on the development of a new algorithm able to identify an electron Cherenkov ring using the NA62 Ring Imaging CHerenkov detector (RICH). The algorithm is developed to act as an online Level 1 trigger algorithm and its execution time is studied to make it as fast as possible. In parallel, an efficiency analysis of the official offline NA62 RICH multi-ring reconstruction algorithm is performed in case it will be used as an online trigger algorithm. Studies on the efficiency and the rejection factor of the trigger cut to select the lepton number violating process K + → π−e+e+ are described. Concerning the Level 1 trigger cut strategy, it is based on the use of the RICH detector only. Finally, a brief description of the NA62 PC-farm, where all the software trigger algorithms are implemented, is described.

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    J/\(\psi\) production in proton-proton collisions at ALICE LHC

    Kour, Ravjeet
    University of Birmingham
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    Title: J/\(\psi\) production in proton-proton collisions at ALICE LHC
    Author: Kour, Ravjeet
    Date: 2011
    Subject: Qc Physics
    Description: A Large Ion Collider Experiment (ALICE) studies the strong interaction part (Quantum Chromo Dynamics) of the Standard Model at the CERN Large Hadron Collider. ALICE has been designed as a general-purpose heavy-ion detector in order to explore phenomena of strong interacting matter and the quark-gluon plasma (QGP) at extreme values of energy density and temperature in nucleus-nucleus collisions. Results are presented here on the study of J/\(\psi\)production in pp collisions at ALICE. In particular, a measurement of J/\(\psi\) cross-section at \(\sqrt{s}\) = 7 TeV energy has been performed, together with a study of a possible algorithm to separate primary J/\(\psi\) from those coming from decays of B hadrons. The validity of this algorithm in ALICE has been demonstrated using Monte-Carlo samples. The J/\(\psi\) particles have been searched exclusively in the decay channel J/\(\psi\) -> e+e−. The study focused on what would be achievable in a period of early running, with integrated luminosity of L=1.25 nb-1, at a proton-proton centre of mass collision energy of \(\sqrt{s}\) = 7 TeV.