International Workshop on Future Linear Colliders, LCWS2021

Session

PD3: Physics Analyses

16 Mar 2021, 06:00

Online Conference (Zoom)

Conveners

PD3: Physics Analyses

• Akimasa Ishikawa (KEK)
• Christopher Thomas Potter (University of Oregon (US))
• Roman Poeschl (Université Paris-Saclay (FR))
• Aleksander Filip Zarnecki (University of Warsaw)

PD3: Physics Analyses

• Christopher Thomas Potter (University of Oregon (US))
• Aleksander Filip Zarnecki (University of Warsaw)
• Roman Poeschl (Université Paris-Saclay (FR))
• Akimasa Ishikawa (KEK)

PD3: Physics Analyses

• Aleksander Filip Zarnecki (University of Warsaw)
• Akimasa Ishikawa (KEK)
• Christopher Thomas Potter (University of Oregon (US))
• Roman Poeschl (Université Paris-Saclay (FR))

160. SiD Analyses for Snowmass Physics LoIs: Status and Plans

Christopher Thomas Potter (University of Oregon (US))

16/03/2021, 06:00

PD3: Physics Analyses

The US Particle Physics Community Planning Exercise (aka Snowmass), sponsored by the APS Division of Particles and Fields, provides an opportunity for particle physicists in the US, together with international partners, to build consensus on possible future projects and explore their potential scientific reach. The Silicon Detector (SiD) is one of two mature detector concepts proposed for the...

168. Di-Higgs production in e+e- Collisions and Measurement of the Higgs Self-Coupling

Peter Onyisi (University of Texas at Austin (US))

16/03/2021, 06:20

Determination of the Higgs boson self-coupling is crucial for understanding the structure of the electroweak symmetry breaking vacuum. I will review the theoretical extraction of the self-coupling from observed cross sections of e+e- -> Zhh and e+e- -> vvhh at high energy, current projections of experimental sensitivity, and the limiting factors for this measurement.

114. Study of HγZ coupling using e+e- -> γ H at the ILC

Yumi Aoki (KEK/SOKENDAI)

16/03/2021, 06:40

PD3: Physics Analyses

In the Standard Model（SM）, ΗγZ coupling is a loop induced coupling, therefore it might receive relatively large correction from Beyond Standard Model（BSM） physics. It is very challenging to measure at the HL-LHC, where only 3σ significance is expected for branching ratio of H$\to$γZ. On the other hand, HγZ coupling is potentially very sensitive to new physics, for example some new heavy...

69. Measurement of σ(e+e− → HZ) × Br(H → ZZ∗ ) at the 250 GeV ILC

Evgeny Antonov (Lebedev Physical Institute of the Russian Academy of Science)

16/03/2021, 07:00

PD3: Physics Analyses

We report on studies of the e+e− → HZ process with the subsequent decay of the Higgs boson H → ZZ , where the ZZ combination is reconstructed in the final states with two jets and two leptons. The analysis is performed using Monte Carlo data samples obtained assuming the ILD detector model, the integrated luminosity 2 ab−1 and the center-of-mass energy √s = 250 GeV. Signals are measured for...

72. Potential of the Compact Linear Collider (CLIC) to measure branching fraction of the Higgs to ZZ* decays 350 GeV and 3 TeV center-of-mass energy

Ms Natasa Vukasinovic (VINCA Institute of Nuclear Sciences, University of Belgrade)

16/03/2021, 07:20

PD3: Physics Analyses

As a multi-TeV energy-staged machine, CLIC offers millions of Higgs bosons to be produced in a low-background environment enabling measurements of most of the Higgs couplings at a few per mille level. To this end, individual measurements at different CLIC energy stages, in various Higgs production and decay channels, are subjects of global fits of the Higgs properties in model-independent or...

74. Measurement of the Higgs to di-photon branching fraction at 3 TeV CLIC

Goran Kacarevic (University of Belgrade (RS))

16/03/2021, 07:40

PD3: Physics Analyses

In this talk we address a potential of 3 TeV center-of-mass energy Compact Linear Collider (CLIC) to measure the Standard Model (SM) Higgs boson decay to two photons. Since photons are massless, they are coupled to the Higgs boson at a loop level, in exchange of heavy particles either from the Standard Model or beyond. Any deviation of the Higgs to di-photon branching fraction and...

26. Search for the pair-production of charged IDM scalars at high energy CLIC

Jan Franciszek Klamka (University of Warsaw (PL))

16/03/2021, 11:00

PD3: Physics Analyses

Compact Linear Collider (CLIC) was proposed as the next energy-frontier infrastructure at CERN, allowing to study $e^{+}{e}^{-}$ collisions at three centre-of-mass energy stages: 380 GeV, 1.5 TeV and 3 TeV. The main goal of its high-energy stages is to search for the new physics beyond the Standard Model (SM). The Inert Doublet Model (IDM) is one of the simplest SM extensions and introduces four...

29. Stau Searches at the ILC

Dr Maria Teresa Nunez Pardo de Vera (DESY)

16/03/2021, 11:20

PD3: Physics Analyses

The direct pair-production of the tau-lepton superpartner, stau, is one
of the most interesting channels to search for SUSY. First of all the stau is
with high probability the lightest of the scalar leptons. Secondly the
signature of stau pair production signal events is one of the most difficult
ones, yielding to the 'worst' and so most global scenario for the searches.
The current...

79. A combined fit to the Higgs Branching Ratios at ILD

Jonas Kunath (LLR – CNRS, École polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France.)

16/03/2021, 11:40

PD3: Physics Analyses

We introduce here a new method to measure the Higgs decay branching ratios at future e⁺e⁻ Higgs factories, by directly exploiting class numeration.
Given the clean environment at a lepton collider, we build an event sample highly enriched in Higgs bosons and essentially unbiased for any decay mode.
The sample can be partitioned into categories using event properties linked to the expected...

20. Optimising top-quark threshold scan at $e^{+}{e}^{-}$ colliders using genetic algorithm

Kacper Nowak (University of Warsaw)

16/03/2021, 12:00

PD3: Physics Analyses

One of the important goals at the future $e^{+}{e}^{-}$ colliders is to measure
the top-quark mass and width in a scan of the pair production threshold.
However, the shape of the pair-production cross section at the
threshold depends also on other model parameters, as the top Yukawa
coupling, and the measurement is a subject to many systematic uncertainties.
Presented in this work is the most...

287. Photon-Photon Processes at the ILC and BSM signatures with small mass differences

Swathi Sasikumar (Deutches Elektronen Synchrotron)

16/03/2021, 12:20

In supersymmetric extensions of the Standard Model,higgsino-like charginos and neutralinos are preferred to have masses of the order of the elecktroweak scale by naturalness arguments. Light higgsinos are also well motivated from a top-down perspective. Such light ${\tilde{\chi }}_1^{\pm }$, ${\tilde{\chi }}_1^0$ and ${\tilde{\chi }}_2^0$ states can be almost mass degenerate. In this talk the...

197. Impact of the HL-LHC detector upgrades on the physics program

Susanne Kuehn (CERN)

17/03/2021, 09:00

198. Measurements of rare SM processes at LHC

Xunwu Zuo (University of Florida (US))

17/03/2021, 09:30

80. Prospects of measuring the branching fraction of the Higgs boson decaying into muon pairs at the ILC

Dr Shin-ichi Kawada (DESY)

17/03/2021, 10:00

PD3: Physics Analyses

Measuring Higgs properties is one of the most important research topics at the Higgs factory.
In this talk, we discuss the prospects of measuring the branching fraction of the Higgs boson decaying into muon pairs at the ILC.
We also discuss the impact of the transverse momentum resolution for this analysis.

143. Heavy quark production in high energy electron positron collisions at ILC250

Adrian Irles (IFIC CSIC/UV)

17/03/2021, 10:20

PD3: Physics Analyses

We report here the experimental prospects on the measurement of cross section and the forward-backward asymmetry for quark and antiquark production in electron positron collisions at 250 GeV at the International Linear Collider operating polarised beams. Thanks to the beam polarisation, we can separate the four independent chirality combinations of the electroweak couplings maximizing in this...