# 9th Edition of the Large Hadron Collider Physics Conference

7-12 June 2021
Zoom
Europe/Paris timezone

## Combined Constraints on First Generation Leptoquarks

Jun 10, 2021, 6:45 PM
1h
Zoom

#### Zoom

Theory poster Flavour physics

Luc Schnell

### Description

We present a combined analysis of low energy precision constraints and LHC searches for leptoquarks which couple to first generation fermions. Considering all ten leptoquark representations, five scalar and five vector ones, we study at the precision frontier the constraints from $K\to\pi\nu\nu$, $K\to\pi e^+e^-$, $K^0-\bar K^0$ and $D^0-\bar D^0$ mixing, as well as from experiments searching for parity violation (APV and QWEAK). We include LHC searches for $s$-channel single resonant production, pair production and Drell-Yan-like signatures of leptoquarks. Particular emphasis is placed on the recent CMS analysis of lepton flavour universality violation in non-resonant di-lepton pairs. The excess in electron events could be explained by $t$-channel contributions of the leptoquark representations $\tilde{S}_1, S_2, S_3, \tilde{V}_1, V_2 (\kappa_2^{RL} \neq 0)$ and $V_3$ without violating other bounds. Regarding the so-called Cabibbo angle anomaly'', we observe that the present constraints are too restrictive to allow for a resolution via direct leptoquark contributions to super-allowed beta decays.

### Co-authors

Andreas Crivellin (Universitaet Zuerich (CH)) Dario Müller (PSI / UZH)

### Presentation materials

 Link to Zoom room Poster (Landscape).pdf Slides.pdf Video Explanation.mp4