# EPS-HEP2021 conference

26-30 July 2021
Zoom
Europe/Berlin timezone

## A combined fit to the Higgs Branching Ratios at ILD

29 Jul 2021, 10:21
17m
Zoom

#### Zoom

Parallel session talk Higgs Physics

### Speaker

Jonas Kunath (LLR – CNRS, École polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France.)

### Description

We introduce here a new method to measure the Higgs decay branching ratios at future $e^+e^-$ Higgs factories, by directly exploiting class numeration. Given the clean environment at a lepton collider, we build an event sample highly enriched in Higgs bosons and essentially unbiased for any decay mode. The sample can be partitioned into categories using event properties linked to the expected Higgs decay modes. The counts per category are used to fit the Higgs branching ratios in a model independent way. The result of the fit is directly the set of branching ratios, independent from any measurement of a Higgs production mode. Special care is given to an appropriate treatment of the statistical uncertainties. In this contribution, the current status of our implementation of this analysis within the ILD concept detector is presented.

Collaboration / Activity The ILD concept group kawagoe@phys.kyushu-u.ac.jp Kiyotomo Kawagoe

### Primary authors

Kiyotomo Kawagoe (FLC (Forschung an Lepton Collidern)) Vincent Boudry (LLR – École polytechnique) Jonas Kunath (LLR – CNRS, École polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France.) Jean-Claude Brient (LLR, Ecole Polytechnique, CNRS-IN2P3) Fabricio Jimenz (LLR, Ecole Polytechnique, CNRS-IN2P3)