New experimental results

LHCb results strengthen hints of a violation of lepton flavour universality

April 7, 2021

Theory Division

LHCb has overcome the 3 sigma barrier in the tension between the measurement of the observable RK and the prediction of the SM, reaching 3.1 sigmas. This observable tests the universality (or not) of leptonic flavor. The SM predicts a value of 1 very accurately for this observable.

Marcel Algueró on behalf of the group led by Joaquim Matias presented the implications of this new data in the global analyzes of observables governed by b-> sll in the (virtual) conference of Moriond QCD 2021.

Joaquim Matias is quoted in an article about the results in Diaria Ara

Link to CERN Press release

Latest Group News

New publication

New theory paper on the muon anomalous magnetic moment

May 18, 2022

Evaluation of the three-flavor quark-disconnected contribution to the muon anomalous magnetic moment from experimental data” by S. Peris, M. Golterman (IFAE visitor) and collaborators has been published at Physical Review D. The article is highlighted as an Editor’s Suggestion.

New Member

New Member in the Theory group

May 11, 2022

Mario Herrero has just joined the Theory group as a Juan de la Cierva Postdoc researcher.

New Paper

New Theory Group Paper on Gravitational waves from axionic defects

April 20, 2022

High Quality QCD Axion at Gravitational Wave Observatories” by Ricardo Z. Ferreira, O. Pujolas and collaborators has been published at Physical Review Letters.