# EPS-HEP2019

10-17 July 2019
Ghent
Europe/Brussels timezone

## HAMMER: a tool for new physics searches in semileptonic decays at Belle II and LHCb

12 Jul 2019, 11:45
20m
Campus Ledeganck - Aud. 5 (Ghent)

### Campus Ledeganck - Aud. 5

#### Ghent

Parallel talk Flavour Physics and CP Violation

### Speaker

Stephan Duell (University of Bonn)

### Description

The search for new physics (NP) involving semileptonic $b$-hadron decays requires large, dedicated Monte Carlo data sets, in order to properly model acceptance and selection efficiencies. We present the Hammer reweighting tool, developed for and in conjunction with the LHCb and Belle II experiments, that makes use of an efficient event and histogram reweighting strategy, permitting computationally inexpensive exploration of NP effects in the fully differential phase space. The Hammer approach also permits study of the effects of different choices for hadronic form-factor parametrizations, crucial for the measurement of the CKM elements $|V_{cb}|$ and $|V_{ub}|$ In this talk we show various example applications of this tool, both for NP and CKM matrix studies.

### Primary authors

Dean Robinson (UC Santa Cruz/ LBL) Florian Urs Bernlochner (KIT - Karlsruhe Institute of Technology (DE)) Stephan Duell (University of Bonn) Michele Papucci (Lawrence Berkeley National Laboratory) Michele Papucci (Lawrence Berkeley National Laboratory (LBNL)) Zoltan Ligeti (Lawrence Berkeley National Lab. (US))