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SUMMARY:The Simplest B decay\, precisely
DTSTART:20260507T090000Z
DTEND:20260507T100000Z
DTSTAMP:20260515T202700Z
UID:indico-event-13701@indico.ijclab.in2p3.fr
DESCRIPTION:Speakers: Max Ferré (Universität Mainz)\n\nIn this talk\, I 
 will focus on the study of the leptonic decay $B\\rightarrow \\ell \\nu_{\
 \ell}$ at next-to-leading order in QED. The future improvements of experim
 ental measurements of this channel require a reliable theory prediction\, 
 hence a careful theoretical estimate of QED corrections. The multi-scale c
 haracter of this process requires an appropriate effective theory (EFT) co
 nstruction to factorize the different contributions. In the first part of 
 this talk\, I will discuss the EFT description of the process at the parto
 nic level\, which is based on Heavy Quark Effective Theory and Soft Collin
 ear Effective Theory. I will show how the inclusion of QED corrections dem
 ands a generalisation of the hadronic decay constant defining a new non-pe
 rturbative input. In the second part of the talk\, I will discuss the EFT 
 description below the confinement scale based on the Heavy Hadron Chiral L
 agrangian and derive a factorisation formula for the decay rate. I will fi
 nally estimate the numerical impact of each contributions from this formul
 a to the final rate and assess their associated uncertainties.\n\nhttps://
 indico.ijclab.in2p3.fr/event/13701/
LOCATION:210/1-114 - Salle des Séminaires (IJCLab)
URL:https://indico.ijclab.in2p3.fr/event/13701/
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