CLIC Detector and Physics Collaboration Meeting

Session

Physics/Analysis

29 Aug 2017, 10:30

503/1-001 - Council Chamber (CERN)

Conveners

Physics/Analysis

• Jürgen Reuter (DESY Hamburg, Germany)
• Lars Rickard Strom (CERN)
• Esteban Fullana Torregrosa (Univ. of Valencia and CSIC (ES))

Physics/Analysis

• Jürgen Reuter (DESY Hamburg, Germany)
• Lars Rickard Strom (CERN)
• Esteban Fullana Torregrosa (Univ. of Valencia and CSIC (ES))

30. Limits on top FCNC decay t->cH from CLIC at 380 GeV

Aleksander Filip Zarnecki (University of Warsaw)

29/08/2017, 10:30

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...

31. Update on FCNC t->c gamma at 380 GeV

Naomi Van Der Kolk (Max-Planck-Institut fur Physik (DE))

29/08/2017, 10:50

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...

32. Status of ee -> gamma gamma analysis

Igor Boyko (Joint Institute for Nuclear Research (RU))

29/08/2017, 11:10

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.

33. BSM Hidden valley searches

Marcin Kucharczyk (Polish Academy of Sciences (PL))

29/08/2017, 11:25

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...

35. The Higgs couplings and self-coupling in the EFT framework

Jiayin Gu (DESY)

29/08/2017, 11:45

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...

36. Top Yukawa coupling measurement at 1.4 TeV at CLIC

Mr Yixuan Zhang (University of Edinburgh (GB))

29/08/2017, 16:30

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...

40. WW/ZZ separation and timing cut comparison for old and new CLIC detector model

Sascha Simon Dreyer, Lars Rickard Strom (CERN), Matthias Artur Weber (CERN)

29/08/2017, 16:45

15 minutes presentation + 5 minutes discussion

38. Top forward-backward asymmetry with boosted reconstruction methods at multi-TeV CLIC

Lars Rickard Strom (CERN)

29/08/2017, 17:05

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...

39. The top-antitop threshold in WHIZARD

Maximilian Stahlhofen

29/08/2017, 17:25

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...

37. A Top Threshold Scan with with Luminosity Spectrum of the 380 GeV Machine

Frank Simon (Max-Planck-Institut fuer Physik)

29/08/2017, 17:45

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...

34. W/Z separation in new and old detector model

Sascha Simon Dreyer, Lars Rickard Strom (CERN), Matthias Artur Weber (CERN)

8 minutes presentation + 2 minutes discussion