On the physics potential of ILC and CLIC

Żarnecki, Aleksander Filip

doi:10.22323/1.376.0037

Cited by 8 publications

(13 citation statements)

References 18 publications

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“…The main interest of this article is investigation of the CP violation in the electron-positron annihilation into a pair of top quarks decaying into W bosons and bottom quarks. Such process is planned to be explored at future electron-positron colliders like International Linear Collider (ILC) [1][2][3] and Compact Linear Collider (CLIC) [4][5][6][7][8]. The ILC will start at the center-of-mass (CM) energy of 250 GeV followed by 500 GeV upgrade [7,9].…”

Section: Introductionmentioning

confidence: 99%

“…Such process is planned to be explored at future electron-positron colliders like International Linear Collider (ILC) [1][2][3] and Compact Linear Collider (CLIC) [4][5][6][7][8]. The ILC will start at the center-of-mass (CM) energy of 250 GeV followed by 500 GeV upgrade [7,9]. The CLIC promises to be a good candidate for production of the on-mass-shell top quark and studying its properties.…”

Section: Introductionmentioning

confidence: 99%

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Energy correlation of bottom quarks from decays of top quarks in electron$-$positron annihilation

Truten,

Korchin

2021

Preprint

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Joint energy distribution of the bottom quark and antiquark from decays of the top quark and antiquark produced in the reaction e + e − → t t is studied. Main emphasis is put on CP -violation effects in the interaction of the photon and Z boson with the top quarks. Energy asymmetries of b and b quarks, which give access to the CP -violating terms, are considered. To estimate the magnitude of these asymmetries, the CP -violating γt t and Zt t couplings are calculated in one-loop model with exchange of the Higgs boson. Interaction of this boson with the top quarks is assumed to include scalar and pseudoscalar couplings. Values of these couplings are constrained from the recent CMS analysis. Energy dependence of the asymmetries of b and b quarks is calculated up to √ s = 1.2 TeV and some interesting features of their behavior are observed. These observables can be of interest for future studies at electron-positron colliders CLIC and ILC.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Energy correlation of bottom quarks from decays of top quarks in electron$-$positron annihilation

Truten,

Korchin

2021

Preprint

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“…An important direction of research is study of properties of the top quark. These properties are planned to be explored precisely on future electron-positron colliders, such as International Linear Collider (ILC) [1] and Compact Linear Collider (CLIC) [2][3][4]. The ILC will start at the center-of-mass energy of 250 GeV followed by 500 GeV upgrade [4,5].…”

Section: Introductionmentioning

confidence: 99%

“…These properties are planned to be explored precisely on future electron-positron colliders, such as International Linear Collider (ILC) [1] and Compact Linear Collider (CLIC) [2][3][4]. The ILC will start at the center-of-mass energy of 250 GeV followed by 500 GeV upgrade [4,5]. The CLIC promises to be a good candidate for production of the on-mass-shell top quark and studying its properties.…”

Section: Introductionmentioning

confidence: 99%

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Energy and angular distributions of the bottom quark in the electron-positron annihilation $e^+e^-\to b \, W^+ \, \bar{t}$

Truten,

Korchin

2020

Preprint

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e + e − energy corresponding to the first construction stage of the Compact Linear Collider. The cross sections of e + e − → b . . ., as functions of the b-quark energy and angle with respect to the direction of the electron beam, are derived and calculated. The effects of physics beyond the Standard Model are included via the modified γt t and Zt t couplings which naturally appear in effective field theories. In addition to the cross sections, the energy and angular asymmetries are calculated. The dependence of these observables on the e + e − energy is calculated, and features of this dependence are investigated.

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Probing the CP structure of the top quark Yukawa at the future muon collider

Cassidy,

Dong,

Kong

et al. 2024

J. High Energ. Phys.

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We study the top-Higgs coupling with a CP violating phase ξ at a future multi-TeV muon collider. We focus on processes that are directly sensitive to the top quark Yukawa coupling: $$ t\overline{t}h $$ t t ¯ h , tbhμν, and $$ t\overline{t} h\nu \overline{\nu} $$ t t ¯ hν ν ¯ with $$ h\to b\overline{b} $$ h → b b ¯ and semileptonic top decays. At different energies, different processes dominate the cross section, providing complementary information. At and above an energy of $$ \mathcal{O}(10) $$ O 10 TeV, vector boson fusion processes dominate. As we show, in the Standard Model there is destructive interference in the vector boson fusion processes $$ t\overline{t} h\nu \overline{\nu} $$ t t ¯ hν ν ¯ and tbhμν between the top quark Yukawa and Higgs-gauge boson couplings. A CP-violating phase changes this interference, and the cross section measurement is very sensitive to the size of the CP-violating angle. Although we find that the cross sections are measured to $$ \mathcal{O}\left(50\%\right) $$ O 50 % statistical uncertainty at 1σ, a 10 and 30 TeV muon collider can bound the CP-violating angle |ξ| ≲ 9.0° and |ξ| ≲ 5.4°, respectively. However, cross section measurements are insensitive to the sign of the CP-violating angle. To determine that the coupling is truly CP violating, observables sensitive to CP-violation must be measured. We find in the $$ t\overline{t}h $$ t t ¯ h process the azimuthal angle between the $$ t+\overline{t} $$ t + t ¯ plane and the initial state muon+Higgs plane shows good discrimination for ξ = ±0.1π. For the tbhμν and $$ t\overline{t} h\nu \overline{\nu} $$ t t ¯ hν ν ¯ processes, the operator proportional to $$ \left({\overrightarrow{p}}_{\mu}\times {\overrightarrow{p}}_h\right) $$ p → μ × p → h · $$ {\overrightarrow{p}}_t $$ p → t is sensitive to the sign of CP phase ξ. From these observables, we construct asymmetry parameters that show good distinction between different values and signs of the CP violating angle.

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On the physics potential of ILC and CLIC

Cited by 8 publications

References 18 publications

Energy correlation of bottom quarks from decays of top quarks in electron$-$positron annihilation

Energy correlation of bottom quarks from decays of top quarks in electron$-$positron annihilation

Energy and angular distributions of the bottom quark in the electron-positron annihilation $e^+e^-\to b \, W^+ \, \bar{t}$

Probing the CP structure of the top quark Yukawa at the future muon collider

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