Help us make Indico better by taking this survey! Aidez-nous à améliorer Indico en répondant à ce sondage !

Nov 4 – 8, 2024
Uppsala University Main Building
Europe/Stockholm timezone

Higgs properties (mass/width/CP) and detector requirements at the FCC-ee

Nov 5, 2024, 2:50 PM
20m
Uppsala University Main Building

Uppsala University Main Building

Biskopsgatan 3 75310 Uppsala Sweden
Higgs physics at future colliders Higgs physics at future colliders 1 - sal IV

Speaker

Maria Cepeda (CIEMAT)

Description

The FCC-ee offers powerful opportunities to determine the Higgs boson parameters, exploiting about 2*10^6 e+e-→ZH events and almost 10^5 WW→H events at centre-of-mass energies around 240 and 365 GeV. The determination of the Higgs boson mass with a precision significantly better than the Higgs boson width (4.1 MeV in the Standard Model) is a prerequisite to either constrain or measure the electron Yukawa coupling via direct e+e-→H production at √s=125 GeV, as well as the being a limiting parametric uncertainty on the calculation of Higgs branching ratios. Approaching the statistical limit of 0.1% and O(1) MeV on the ZH cross section and the Higgs boson mass respectively, and of O(1%) on the Higgs total width, sets highly demanding requirements on accelerator operation (ZH threshold scan, centre-of-mass energy measurement), detector design (lepton momentum resolution, hadronic final state reconstruction performance), theoretical calculations, and analysis techniques (efficiency and purity optimization with modern tools, constrained kinematic fits, control of systematic uncertainties). Perspectives for the precise measurement of CP properties of the HVV couplings have been also performed with the matrix-element package MELA, that has been used to introduce event based-weights into the Standard Model simulation and to calculate optimal kinematic observables.

Is the speaker a PhD student or post-doc? No

Primary authors

Presentation materials