CLIC Detector and Physics Collaboration Meeting

Europe/Zurich
503/1-001 - Council Chamber (CERN)

503/1-001 - Council Chamber

CERN

31
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Description

The 2-day meeting on the CLIC detector and physics study will start on Tuesday 29 August 08:30 and will end on Wednesday 30 August around 17:30. Most of the time will be devoted to topical sessions, providing an overview of ongoing activities and future plans. In order to allow the participants to get a good overview of the work in CLICdp, we try to avoid parallel sessions. The timetable presently proposed is tentative - sessions can be shortened/extended at a later stage, according to the proposed number of talks.

We foresee to have the following topical sessions (and conveners):

  • Physics and Analysis (Esteban Fullana, Juergen Reuter, Rickard Strom)
  • Software / Detector Validation (Matthias Weber, Andre Sailer)
  • Vertex / Tracker R&D (Mathieu Benoit, Andreas Nurnberg, Simon Spannagel)
  • FCAL / ECAL / HCAL R&D (Aharon Levy, Frank Simon)

A CLICdp Institute Board meeting is scheduled for Tuesday lunchtime, 29 August.

The workshop dinner is scheduled for Tuesday evening, 29 August, 19h30 at La Maison d'Asie in Geneva (cost: 50 CHF all included).

Participants
  • Adrian Fiergolski
  • Aharon Levy
  • Aidan Robson
  • Aleksander Filip Zarnecki
  • Andre Sailer
  • Andreas Alexander Maier
  • Andreas Nürnberg
  • Angel Christian Abusleme Hoffman
  • Blaising Jean-Jacques
  • Daniel Hynds
  • Dominik Arominski
  • Edinei Santin
  • Emilia Leogrande
  • Esteban Fullana Torregrosa
  • Estel Perez Codina
  • Eva Sicking
  • Fabien Plassard
  • Felix Sefkow
  • Fernando Duarte Ramos
  • Florian Pitters
  • Frank Simon
  • Halina Abramowicz
  • Haluk Denizli
  • Ignacio Garcia
  • Igor Boyko
  • Iraklis Kremastiotis
  • Jaroslav Cvach
  • Jiayin Gu
  • Jorge de Blas
  • Katja Krueger
  • Koen Wolters
  • Konrad Elsener
  • Lucie Linssen
  • Magdalena Munker
  • Marcin Kucharczyk
  • Marko Petric
  • Maryna Borysova
  • Mateus Vicente
  • Mathieu Benoit
  • Matthew Buckland
  • Matthias Artur Weber
  • Maximilian Stahlhofen
  • Mila Pandurovic
  • Morag Williams
  • Naomi Van Der Kolk
  • Oleksandr Borysov
  • Oleksandr Viazlo
  • Peter Winkel Rasmussen
  • Philip Nicholas Burrows
  • Philipp Roloff
  • Rafael Ballabriga Suñe
  • Rickard Ström
  • Roma Bugiel
  • Sascha Simon Dreyer
  • Simon Spannagel
  • Szymon Bugiel
  • Thorben Quast
  • Tomas Vanat
  • Ulrike Schnoor
  • Victoria Jane Martin
  • Yixuan Zhang
  • Tuesday, 29 August
    • 08:00 08:30
      Registration 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

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    • 08:30 10:00
      CLICdp Plenary: Welcome 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      31
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    • 10:00 10:30
      Coffee Break 30m 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      31
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    • 10:00 10:30
      Registration 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

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    • 10:30 12:00
      Physics/Analysis 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

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      Conveners: Esteban Fullana Torregrosa (Univ. of Valencia and CSIC (ES)) , Jürgen Reuter (DESY Hamburg, Germany) , Lars Rickard Strom (CERN)
      • 10:30
        Limits on top FCNC decay t->cH from CLIC at 380 GeV 20m

        Prospects for measuring top FCNC decays at 380 GeV were studied with the full simulation samples including signal sample generated with the WHIZARD implementation of the 2HDM(III) model and the standard six-fermion event samples used for top pair production studies. Analysis was divided into three steps: event classification, kinematic reconstruction based on signal or background hypothesis and final signal vs background discrimination. To obtain optimal results, selection criteria based on the dedicated Boosted Decision Tree (BDT) responce were used at each step. Expected limits on BR(t->cH)*BR(H->bb) are presented.

        15 minutes presentation + 5 minutes discussion

        Speaker: Aleksander Filip Zarnecki (University of Warsaw)
      • 10:50
        Update on FCNC t->c gamma at 380 GeV 20m

        In the Standard Model, FCNC top decays, are very strongly suppressed. Observing such a decay would be a direct signature of physics beyond the SM as large enhancements are possible in many "new physics" scenarios. A full simulation study for CLIC at 380 GeV based on a WHIZARD simulation of FCNC top decay t -> c gamma within the 2HDM(III) model is performed. An update on this analysis including background suppression of standard top decay channels (cut based and TMVA) is presented, including a first estimate of the discovery limit.

        15 minutes presentation + 5 minutes discussion

        Speaker: Naomi Van Der Kolk (Max-Planck-Institut fur Physik (DE))
      • 11:10
        Status of ee -> gamma gamma analysis 15m

        The CLIC sensitivity to the QED process ee->gamma gamma
        at 3 TeV is studied using SiD geometry model.
        The estimated precision on total and differential
        cross-sections is converted into the exclusion limits
        on various New Physics models, including finite electron size,
        extra dimensions, contact interactions, excited electrons.

        Speaker: Igor Boyko (Joint Institute for Nuclear Research (RU))
      • 11:25
        BSM Hidden valley searches 20m

        Sensitivity studies of the BSM Hidden Valley particles have been performed for the e+e- collisions at the centre-of-mass energy of 3 TeV in the CLIC detector,
        corresponding to an integrated luminosity of 2 ab-1. Hidden Valley particles may be stable, providing dark matter candidates and missing energy signals,
        but others may decay into neutral combinations of Standard Model particles. Since the Higgs boson may also decay into two Hidden Valley particles, providing
        four b-jets in the final state which are away from the primary vertex and the beam axis, analysis relies on loosely reconstructed displaced vertices assigned to the b-jets.
        The final aim of the present analysis is to determine the upper limits of the cross sections for the Hidden Valley particle production for different masses and lifetimes.

        Speaker: Marcin Kucharczyk (Polish Academy of Sciences (PL))
      • 11:45
        The Higgs couplings and self-coupling in the EFT framework 15m

        We study the reach on the Higgs coupling constraints at future lepton colliders in a global effective-field-theory framework. The impact and complementarity of different measurements, at different center-of-mass energies and for several beam polarization configurations, are discussed in detail. This framework is also applied to study the constraints on the Higgs self-coupling. Based on arXiv:1704.02333 and current study.

        12 minutes presentation + 3 minutes discussion

        Speaker: Jiayin Gu (DESY)
    • 12:00 14:00
      Lunch 2h 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

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    • 12:15 13:45
      CLICdp Institute Board 1/1-025

      1/1-025

      CERN

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      https://indico.cern.ch/event/656038/

    • 14:00 16:00
      FCAL/ECAL/HCAL R&D 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

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      Conveners: Aharon Levy (Tel Aviv University (IL)) , Frank Simon (Max-Planck-Institut fuer Physik)
      • 14:00
        FoCal: MAPS digital calorimetry 23m
        Speaker: Naomi Van Der Kolk (Max-Planck-Institut fur Physik (DE))
      • 14:23
        The CALICE AHCAL: Progress with the Technical Prototype 23m
        Speaker: Felix Sefkow (Deutsches Elektronen-Synchrotron (DE))
      • 14:46
        The CMS HGCAL Testbeams 23m
        Speaker: Thorben Quast (Rheinisch-Westfaelische Tech. Hoch. (DE))
      • 15:09
        Beam test of a compact LumiCal prototype 17m
        Speaker: Maryna Borysova (National Academy of Sciences of Ukraine (UA))
      • 15:26
        LumiCal performance in combination with a tracking detector 17m
        Speaker: Oleksandr Borysov (Tel Aviv University (IL))
      • 15:43
        New developments of the BeamCal 17m
        Speaker: Oleksandr Borysov (Tel Aviv University (IL))
    • 16:00 16:30
      Workshop Photo and Coffee break 30m 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

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    • 16:30 18:30
      Physics/Analysis 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

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      Conveners: Esteban Fullana Torregrosa (Univ. of Valencia and CSIC (ES)) , Jürgen Reuter (DESY Hamburg, Germany) , Lars Rickard Strom (CERN)
      • 16:30
        Top Yukawa coupling measurement at 1.4 TeV at CLIC 15m

        The precision on the top Yuakwa coupling is measured in the e+e -->t ̄tH process at sqrt(s) = 1.4 TeV using Compact Linear Collider (CLIC). The analysis focuses on the 6 jets and 8 jets final states channels using particle flow technique. Leptons are identified first follow by clustering the remaining particles into jets and removing the beam jets. Particles that are not identified as leptons are reclustered into jets and performed flavour-tagging. Optimal selection are investigated to select leptons and to suppress the beam-induced backgrounds. Collection of variables are used as input to the BDT to select signals. The precision of the top Yukawa coupling in the semi-leptonic channel is determined to be 5.92% with no beam polarisation.

        12 minutes presentation + 3 minutes discussion

        Speaker: Mr Yixuan Zhang (University of Edinburgh (GB))
      • 16:45
        WW/ZZ separation and timing cut comparison for old and new CLIC detector model 20m

        15 minutes presentation + 5 minutes discussion

        Speakers: Sascha Simon Dreyer, Lars Rickard Strom (CERN) , Matthias Artur Weber (CERN)
      • 17:05
        Top forward-backward asymmetry with boosted reconstruction methods at multi-TeV CLIC 20m

        In this contribution we outline the path towards studying top quark properties at the multi-TeV collisions of the CLIC physics programme. We discuss the jet reconstruction performance utilising a fat-jet approach and subsequent methods to identify the underlying top sub-structure in boosted topologies. We present results on the cross-section and forward-backward asymmetry as well as an interpretation of the results from the full CLIC programme in terms of EFT operators.

        15 minutes presentation + 5 minutes discussion

        Speaker: Lars Rickard Strom (CERN)
      • 17:25
        The top-antitop threshold in WHIZARD 20m

        In this talk I will report on recent progress in the implementation of threshold resummation into the Monte Carlo event generator WHIZARD. This is crucial for reliable predictions of WWbb production close to the top-antitop threshold. As a key feature we establish a smooth transition between the threshold region and the relativistic (NLO) continuum. For the first time our code allows to study arbitrary differential observables involving the decay products of the tops and including interference with non-resonant background processes at threshold and beyond.

        15 minutes presentation + 5 minutes discussion

        Speaker: Maximilian Stahlhofen
      • 17:45
        A Top Threshold Scan with with Luminosity Spectrum of the 380 GeV Machine 15m

        I will present an update of the study of the top mass measurement and other top properties in a threshold scan, now using the luminosity spectrum of the new CLIC baseline machine. The optimisation of the machine for 380 GeV instead of 500 GeV leads to increased beamstrahlung when operated in the top threshold region, which may result in a degradation of the sensitivity of a threshold scan. The impact of this change will be discussed in the presentation.

        12 minutes presentation + 3 minutes discussion

        Speaker: Frank Simon (Max-Planck-Institut fuer Physik)
    • 19:30 21:30
      Workshop dinner at "La Maison d"Asie": Workshop dinner
  • Wednesday, 30 August
    • 08:30 10:00
      Vertex / Tracker R&D 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      31
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    • 10:00 10:30
      Coffee Break 30m 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      31
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    • 10:30 11:30
      Software / Detector Validation 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      31
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      Conveners: Andre Sailer (CERN) , Matthias Artur Weber (CERN)
    • 11:30 13:00
      Vertex / Tracker R&D 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      31
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      Conveners: Andreas Nürnberg (CERN) , Mathieu Benoit (UNIGE) , Simon Spannagel (CERN)
      • 11:30
        Analysis & Simulations of CLICpix+CCPDv3 Assemblies 20m
        Speaker: Matthew Daniel Buckland (University of Liverpool (GB))
      • 11:50
        Characterization of Capacitively Coupled HR/HV-CMOS Sensor Chips 20m
        Speaker: Iraklis Kremastiotis (KIT - Karlsruhe Institute of Technology (DE))
      • 12:10
        Status of the CaRIBOu DAQ System 20m
        Speaker: Adrian Fiergolski (CERN)
      • 12:30
        Lab & Test Beam Charactierization of the CLICpix2 Chip 20m
        Speakers: Andreas Nürnberg (CERN) , Simon Spannagel (CERN)
    • 13:00 14:00
      Lunch 1h 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      31
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    • 14:00 15:30
      Software / Detector Validation 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      31
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    • 15:30 16:00
      Coffee Break 30m 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      31
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    • 16:00 17:35
      CLICdp Plenary 503/1-001 - Council Chamber

      503/1-001 - Council Chamber

      CERN

      31
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      • 16:00
        Report from the CLIC physics potential WG 25m
        Speaker: Jorge de Blas (Universita e INFN, Padova (IT))
      • 16:25
        Analysis overview 20m
        Speaker: Philipp Roloff (CERN)
      • 16:45
        Report from the Speakers Committee 15m
        Speaker: Igor Boyko (Joint Institute for Nuclear Research (RU))
      • 17:00
        Report from the Publication Committee 15m
        Speakers: Aleksander Filip Zarnecki (University of Warsaw) , TBC
      • 17:15
        Report from the Institute Board meeting 15m
        Speakers: Aidan Robson (University of Glasgow (GB)) , Victoria Jane Martin (University of Edinburgh (GB))