Physicists Narrow Down Universal Constant Critical to Understanding Matter
An international team has made the most precise measurement yet of a fundamental constant that explains why the universe contains matter rather than just energy. The finding, based on nearly a decade of particle-collision data, advances efforts to spot cracks in the Standard Model of physics—insights that could eventually reshape materials science and quantum technology.
Originaltitel: Measurement of the CKM angle γ in the B<sup>0</sup> → DK<sup>∗0</sup> channel using self-conjugate D → K<sup>0</sup><sub>S</sub>h<sup>+</sup>h<sup>−</sup> decays
<p>A model-independent study of CP violation in B<sup>0</sup> → DK<sup>∗0</sup> decays is presented using data corresponding to an integrated luminosity of 9fb<sup>−1</sup> collected by the LHCb experiment at centre-of-mass energies of √s=7,8 and 13TeV. The CKM angle γ is determined by examining the distributions of signal decays in phase-space bins of the self-conjugate D → K<sup>0</sup><sub>S</sub>h<sup>+</sup>h<sup>−</sup> decays, where h=π,K. Observables related to CP violation are measured and the angle γ is determined to be γ=(49<sup>+22</sup><sub>−19</sub>)∘. Measurements of the amplitude ratio and strong-phase difference between the favoured and suppressed B<sup>0</sup> decays are also presented.</p>