New Theory Paper

November 18, 2020

Theory Division

“A new B-flavour anomaly in Bd,s->K0 anti-K0: anatomy and interpretation” by M. Algueró, A. Crivellin, S. Descotes-Genon, J. Matias and M. Novoa-Brunet. has been submitted to the arXiv.

We identify a new anomaly in an observable that we called L, constructed upon the longitudinal amplitudes of the non-leptonic decays Bd->K0* anti K0* versus Bs->K0* anti K0*. This observable is protected from leading order infrared divergences in hard-scattering and weak annihilation diagrams and exihibits a 2.6 sigma tension with data.

We establish a parallelism with RK of semileptonic B decays interchanging leptons by quarks and we identify the dominant Wilson coefficient in an EFT approach that could explain the anomaly with a 25% NP contribution.

Latest Group News

New Publication

New COVID group paper

January 25, 2023

Stochastic simulation of successive waves of COVID-19 in the province of Barcelona has been published in the Infectious Disease Modelling journal by the IFAE COVID grup in collaboration with Centre d’Estudis Demogràfics (CED) and the Internet Research Center (i2CAT).


Diego Blas awarded the Buchalter Cosmology Prize

January 12, 2023

The Buchalter Cosmology 2022 Second Prize was awarded to Diego Blas and his collaborator Alexander Jenkins (UCL), for their work entitled “Bridging the μHz gap in the gravitational-wave landscape with binary resonance ” published in Physical Review Letters.

New Member

New Member in the Theory group

November 2, 2022

Alejandro Miranda. has joined the Theory Division as a postdoctoral researcher.