An exploratory study of heavy-light semileptonic form factors using distillation

TL;DR

This exploratory study investigates heavy-light semileptonic form factors using a distillation-based approach to optimize data extraction in charm and bottom decays, comparing results with traditional methods across various frames.

Contribution

It introduces a distillation-based setup for calculating semileptonic form factors, aiming to improve plateau quality and facilitate comparisons with existing techniques.

Findings

Distillation method provides optimized plateaus in form factor calculations.

Comparison shows potential advantages over sequential Z2-Wall propagators.

Study conducted in multiple frames with plans to extend to physical pion mass ensembles.

Abstract

We present our exploratory study with the aim of simulating heavy-light semileptonic form factors as part of the RBC-UKQCD charm (to bottom) physics programme. We are using a distillation-based setup as a strategy to get optimised plateaus in semileptonic $D_{(s)}$ and $B_{(s)}$ decays, and compare our results to form factors obtained from sequential $Z_2$-Wall propagators. The study is done in a centre-of-mass frame as well as in several moving frames. We use an $N_f=2+1$ domain wall fermion ensemble with a pion mass of $340$ MeV, with the aim of extending the study to a variety of other domain-wall ensembles, including physical-pion mass ensembles.