TY  - JOUR
AU  - LHCb Collaboration (Aaij, R. et al
AU  - Henry, L.
AU  - Jashal, B. K.
AU  - Martinez-Vidal, F.
AU  - Oyanguren, A.
AU  - Remon Alepuz, C.
AU  - Ruiz Vidal, J.
PY  - 2022
DA  - 2022//
TI  - Test of lepton universality in beauty-quark decays
T2  - Nat. Phys.
JO  - Nature Physics
SP  - 277
EP  - 282
VL  - 18
IS  - 3
PB  - Nature Portfolio
AB  - The standard model of particle physics currently provides our best description of fundamental particles and their interactions. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction strengths. Previous measurements have shown that a wide range of particle decays are consistent with this principle of lepton universality. This article presents evidence for the breaking of lepton universality in beauty-quark decays, with a significance of 3.1 standard deviations, based on proton–proton collision data collected with the LHCb detector at CERN's Large Hadron Collider. The measurements are of processes in which a beauty meson transforms into a strange meson with the emission of either an electron and a positron, or a muon and an antimuon. If confirmed by future measurements, this violation of lepton universality would imply physics beyond the standard model, such as a new fundamental interaction between quarks and leptons.
SN  - 1745-2473
UR  - https://arxiv.org/abs/2103.11769
UR  - https://doi.org/10.1038/s41567-021-01478-8
DO  - 10.1038/s41567-021-01478-8
LA  - English
N1  - WOS:000769534600020
ID  - LHCbCollaborationAaij_etal2022
ER  -