Publication

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

Publication

New GW and Theory group publication

July 28, 2021

Search for a scalar induced stochastic gravitational wave background in the third LIGO-Virgo observing run” by A. Romero-Rodriguez, Mario Martinez, O. Pujolàs, M. Sakellariadou, V. Vaskonen has been uploaded to arXiv.

Conference

IFAE at EPS-HEP 2021

July 27, 2021

The European Physical Society conference on high energy physics 2021 (EPS-HEP 2021), one of the most important conferences in HEP of the year, is taking place online this week. Three IFAE groups are participating:

Conference

The IFAE theory group at HADRON 2021

July 27, 2021

The 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman (HADRON2021) is taking place on July 26 - 31, 2021. The Theory Group at IFAE is contributing 2 talks