ILC Workshop on Potential Experiments (ILCX2021)

Session

F-3: Higgs properties

28 Oct 2021, 15:30

Room #2 (Zoom Meeting ID: 823 6921 2312)

Presentation materials

Zoom Link (Room #2)

45. Measurement of $\sigma(e^+e^- \to HZ) \times {\cal B}r(H \to ZZ^*)$ at the 250 GeV ILC

Mr Evgeny Antonov (Lebedev Physical Institute of the Russian Academy of Sciences)

28/10/2021, 15:30

Session F: Higgs properties

Oral presentation using Zoom

We report on studies of the $e^+e^- \to HZ$ process with the subsequent decay of the Higgs boson $H \to Z Z^\star$, where the $Z Z^\star$ combination is reconstructed in the final states with two jets and two leptons. The analysis is performed using Monte Carlo data samples obtained with detailed ILD detector simulation assuming the integrated luminosity 2 ab$^{-1}$, the beam polarizations...

54. Next-to-leading-order corrections to the e+e- → hZ process in extended Higgs models

Mr Masashi Aiko

28/10/2021, 15:50

Session F: Higgs properties

Oral presentation using Zoom

Precision measurements of the properties of the discovered Higgs boson are one of the main programs at current and future collider experiments. At the international linear collider with the center-of-mass energy 250 GeV, e+e- → hZ is the dominant Higgs production process, and the cross section would be measured with a few percent accuracies. In this talk, we present the cross section of the...

301. Kinematic fitting for ParticleFlow Detectors at Future Higgs Factories

Yasser Radkhorrami (DESY)

28/10/2021, 16:10

Session F: Higgs properties

Oral presentation using Zoom

In many analyses in Higgs, top and electroweak physics, the kinematic reconstruction of the final state is improved by constrained fits. This is a particularly powerful tool at $e^{+}e^{-}$ colliders, where the initial state four-momentum is known and can be employed to constrain the final state. A crucial ingredient to kinematic fitting is an accurate estimate of the measurement...

81. Study of photon-associated Higgs production at the ILC

Ms Yumi Aoki (SOKENDAI,KEK)

28/10/2021, 16:30

Session I: Electroweak physics

Oral presentation using Zoom

In the Standard Model（SM）, $h \gamma Z$ 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 3$\sigma$ significance is expected for branching ratio of $h \to \gamma Z$.
On the other hand, $h \gamma Z$ coupling is potentially very sensitive to new...

71. Primordial black holes, gravitational waves and the hhh coupling as a probe of strongly first-order electroweak phase transition

Katsuya Hashino

28/10/2021, 16:50

Session I: Electroweak physics

Oral presentation using Zoom

Recently, it has been discussed that a possibility of primordial black holes is generated from the first-order phase transition at high or low temperatures. We consider the primordial black hole production during first-order electroweak phase transition. In this talk, we discuss the comprehensive test of the model with strongly first-order electroweak phase transition at the measurement of hhh...

90. Possibility of multi-step electroweak phase transition in the two Higgs doublet models

Hiroto Shibuya (Kanazawa University)

28/10/2021, 17:10

Session I: Electroweak physics

Oral presentation using Zoom

In this talk, we discuss whether a multi-step electroweak phase transition (EWPT) occurs in two Higgs doublet models (2HDMs). We examine parameter regions in CP-conserving 2HDMs and find certain areas where the multi-step EWPTs occur. In addition, we compute the Higgs trilinear coupling in the parameter region where the multi-step EWPTs occur, which has the tendency to be large in a certain...