New Theory Paper
November 18, 2020Theory 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.
New theory paper on axions
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Do direct detection experiments constrain axionlike particles coupled to electrons? by Ricardo Z. Ferreira and collaborators has been published at Physical Review Letters.
Theory Group paper featured in AAS Nova research Highlights
June 1, 2022
“New Roads to the Small-scale Universe: Measurements of the Clustering of Matter with the High-redshift UV Galaxy Luminosity Function ” by Diego Blas and collaborators is featured in the AAS Nova research Highlights.
New theory paper on CP violation
May 25, 2022
“New-physics signatures via CP violation in η (0) → π 0 µ + µ − and η 0 → ηµ + µ − decays ” by R. Escribano, E. Royo and P. Sánchez-Puertas has been published in JHEP.