Future e(+)e(-) colliders' sensitivity to Hbb coupling and CP violation

Area of Science:

• High Energy Physics
• Particle Physics
• Quantum Field Theory

Background:

• The Standard Model (SM) describes fundamental particles and forces.
• The Higgs boson's interactions with fermions are crucial for understanding mass generation.
• Investigating Higgs boson couplings to b quarks is essential for probing beyond-SM physics.

Purpose of the Study:

• To perform a complete simulation of the e(+)e(-)-->bbvv process.
• To analyze the Higgs boson coupling to b quarks in a general framework.
• To determine the sensitivity of future e(+)e(-) colliders to deviations in Higgs-b quark couplings.

Main Methods:

• Simulating the e(+)e(-)-->bbvv process, including electron, muon, and tau neutrinos.
• Parametrizing the Higgs-b quark coupling as (m(b)/v)(a + i gamma(5)b).
• Accounting for interference effects between Higgs and SM contributions.

Main Results:

• Future e(+)e(-) colliders can achieve 2% sensitivity for deviations in the 'a' parameter of the Hbb coupling.
• A 20% sensitivity can be obtained for deviations in the 'b' parameter.
• The analysis considers interference effects between Higgs and SM contributions.

Conclusions:

• Precise measurements of Higgs-b quark couplings at future colliders can reveal new physics.
• Combining collider data with measurements of Gamma(H-->bb) can provide evidence for the CP nature of the Higgs sector.
• This study highlights the potential of e(+)e(-) colliders for detailed Higgs boson studies.