# The 39th International Symposium on Lattice Field Theory (Lattice 2022)

Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

## A comparison of Wilson and twisted mass valence quarks for charmed semileptonic form factors

Aug 10, 2022, 3:00 PM
20m
CP1-HSZ/1st-1.002 - HS6 (CP1-HSZ)

### CP1-HSZ/1st-1.002 - HS6

#### CP1-HSZ

50
Oral Presentation Weak Decays and Matrix Elements

### Speaker

Dr Julien Frison (DESY ZPPT/NIC)

### Description

We present the comparison of preliminary results of $D\to\pi$ semileptonic
decays from two related projects: the first one is based on unitary Wilson
fermions, and the second uses valence quarks rotated to maximal twist.
While these projects differ by their goals and strategies, both studies
are performed on CLS $N_f=2+1$ configurations, with similar analysis
techniques. The universality test can then be used as a non-trivial
validation of our calculations, in particular regarding the notoriously
difficult control of excited state contributions to form factors. Finally,
we will discuss the scaling of these two fermionic actions, compared to
their theoretical merits, with a focus on $O(am_c)$ and $O(ap)$ lattice
artefacts.

### Primary authors

Alessandro Conigli (IFT UAM-CSIC) Dr Julien Frison (DESY ZPPT/NIC) Carlos Pena (IFT UAM-CSIC) Gregorio Herdoiza (Instituto de Física Teórica UAM-CSIC)