# EPS-HEP2019

10-17 July 2019
Ghent
Europe/Brussels timezone

## Light Yukawa couplings from double Higgs production

11 Jul 2019, 09:45
15m
Campus Ledeganck - Aud. 5 (Ghent)

### Campus Ledeganck - Aud. 5

#### Ghent

Parallel talk Higgs Physics

### Speakers

Ms Lina Alasfar ( Humboldt Universität zu Berlin) Lina Alasfar (Max-Planck-Gesellschaft (DE)) Lina Alasfar (HU-Berlin)

### Description

One of the puzzles of the SM is the large hierarchy between the Yukawa couplings of different flavours. Yukawa couplings of the first and the second generation are constrained only very weakly so far. However, one can obtain large deviations in the Yukawa couplings in several New Physics (NP) models, such as e.g new vector-like quarks, or new Higgs bosons that couple naturally to individual fermion families. In this talk, we investigate the potential bounds on the NP Higgs Yukawa couplings modification $\kappa_f$ for light quarks from double-Higgs at the LHC. We start disscussing model-independent bounds and then we investigate specific models. We have looked at the Higgses' final states $b \bar b \gamma \gamma$, and the relevant experimental cuts to reduce backgrounds and estimated the potential exclusion bounds for $\kappa_f$ and $\kappa_\lambda$ that can be achieved at the LHC for some models.

### Primary author

Ms Lina Alasfar ( Humboldt Universität zu Berlin)

### Co-author

Prof. Ramona Gröber (Humboldt-Universität zu Berlin)