We present an overview of the capabilities that the International Linear Collider (ILC) offers for precision measurements that probe the Standard Model. First, we discuss the improvements that the ILC will make in precision electroweak observables, both from W boson production and radiative return to the Z at 250 GeV in the center of mass and from a dedicated GigaZ stage of running at the Z pole. We then present new results on precision measurements of fermion pair production, including the production of b and t quarks. We update the ILC projections for the determination of Higgs boson couplings through a Standard Model Effective Field Theory fit taking into account the new information on precision electroweak constraints. Finally, we review the capabilities of the ILC to measure the Higgs boson self-coupling.

Tests of the Standard Model at the International Linear Collider

In gauge-Higgs unification (GHU), the 4D Higgs boson appears as a part of the fifth dimensional component of 5D gauge field. Recently, an $SO(11)$ GUT inspired $SO(5)\times U(1)\times SU(3)$ GHU model has been proposed. In the GHU, Kaluza-Klein (KK) excited states of neutral vector bosons, photon, $Z$ boson and $Z_R$ boson, appear as neutral massive vector bosons $Z'$s. The $Z'$ bosons in the GHU couple to quarks and leptons with large parity violation, which leads to distinctive polarization dependence in, e.g., cross sections and forward-backward asymmetries in $e^-e^+\to\mu^-\mu^+,q\bar{q}$ processes. In the talk, we discuss fermion pair production in $e^-e^+$ linear collider experiments with polarized $e^-$ and $e^+$ beams in the GUT inspired GHU. Deviations from the SM are shown in the early stage of planned international linear collider (ILC) with 250 GeV experiments. The deviations can be tested for the KK mass scale up to about 15 TeV. This talk is mainly based on Phys.Rev.D102(2020)015029.

Linear Collider Signals of $Z'$ Bosons in GUT Inspired Gauge-Higgs Unification

Silicon pad sensors with novel functions of higher timing resolution (LGAD: Low Gain Avalanche Detector) and higher position resolution (PSD: Position Sensitive Detector) are studied for an application to Silicon-Tungsten electromagnetic calorimeter for a detector of the International Linear Collider (ILC). Prototype sensors are fabricated, equipped with dedicated ASICs (Application-Specific Integrated Circuits) and tested with a positron beam as well as a radioisotope. The first results of the measurements of timing resolution with LGADs and position reconstruction with PSDs are reported.

Development of novel silicon sensors with high time and spatial resolution

The pair productions of leptons and quarks at ee Higgs factory are an important probe for new physics via precise measurements. The discovery and exclusion limits of Z ′ models at the International Linear Collider with √ s = 250, 500 and 1000 GeV are calculated with selection efficiencies estimated in the existing full simulation studies. It shows a large potential of BSM searches with precise measurements at future energy-frontier ee colliders. Submitted to the Proceedings of the US Community Study on the Future of Particle Physics (Snowmass 2021)

Two-fermion final states at International Linear Collider

Fermion pair production at ${e}^{\ensuremath{-}}{e}^{+}$ linear collider experiments with polarized ${e}^{\ensuremath{-}}$ and ${e}^{+}$ beams is examined in the GUT inspired $SO(5)\ifmmode\times\else\texttimes\fi{}U(1)\ifmmode\times\else\texttimes\fi{}SU(3)$ gauge-Higgs unification. There arises large parity violation in the couplings of leptons and quarks to Kaluza-Klein (KK) excited neutral vector bosons ${Z}^{\ensuremath{'}}\mathrm{s}$, which leads to distinctive polarization dependence in cross sections, forward-backward asymmetries, left-right asymmetries, and left-right forward-backward asymmetries in various processes. Those effects are detectable even for the KK mass scale up to about 15 TeV at future ${e}^{\ensuremath{-}}{e}^{+}$ linear collider experiments with energies 250 GeV to 1 TeV.

Fermion pair production at e - e + linear collider experiments in GUT inspired gauge-Higgs unification

Precise measurements of electroweak processes at the International Linear Collider (ILC) will provide unique opportunities to explore new physics beyond the Standard Model. Fermion pair production events are sensitive to new interactions involving a new heavy gauge boson or an electroweak interacting massive particle (EWIMP).We studied the mass reach of new particles at the ILC with $\sqrt{s}=250$ GeV by using $e^+ e^-\to e^+ e^-$and $e^+ e^-\to \mu^+ \mu^-$ events. We show that a mass reach for BSM particles can be determined with 90% confidence level using a toy Monte Carlo technique.

Study of fermion pair events at the 250 GeV ILC

Study of fermion pair events at the 250 GeV ILC.

Silicon sensors with high time resolution can help particle identification in the International Linear Collider (ILC). We are studying Low Gain Avalanche Diodes (LGADs) as a high timing resolution sensor. As a step to develop LGADs, we are now focusing to characterize Avalanche Photo Diode (APD)s, because the APDs has the same multiplication structure as LGADs. We studied the characteristics of APDs with particles from radioisotopes.

Study of silicon sensors for precise timing measurement

Silicon sensors with high timing resolution can help particle identification in the International Linear Collider (ILC). We are studying Low Gain Avalanche Detectors (LGADs) as a sensor with high timing resolution. As a step to develop LGADs we are now characterizing Avalanche Photo Diodes (APDs), which have similar multiplication structure as LGADs. Particles from radioisotopes are used for studies in this paper.

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Study of fermion pair events at the 250 GeV ILC

Study of fermion pair events at the 250 GeV ILC.

Development of novel silicon sensors with high time and spatial resolution

Study of silicon sensors for precise timing measurement

Study of silicon sensors for precise timing measurement