Physicists spot potential cracks in the Standard Model of physics
Researchers analyzing rare particle decay patterns at the world's largest physics experiment have found measurements that don't align with established theoretical predictions. The discrepancies, though modest, suggest physics may operate differently than current models assume—a finding that could reshape how scientists understand the universe's fundamental forces and matter itself.
Originaltitel: Angular analysis of the B<sup>0</sup> → K<sup>⁎</sup>(892)<sup>0</sup>μ<sup>+</sup>μ<sup>−</sup> decay in proton-proton collisions at √s=13TeV
<p>A full set of optimized observables is measured in an angular analysis of the decay B<sup>0</sup> → K<sup>∗</sup>(892)<sup>0</sup>μ<sup>+</sup>μ<sup>−</sup> using asample of proton-proton collisions at √𝑠 = 13TeV, collected with the CMS detector at the LHC, correspondingto an integrated luminosity of 140 fb<sup>−1</sup>. The analysis is performed in six bins of the squared invariant mass ofthe dimuon system, 𝑞<sup>2</sup>, over the range 1.1 < 𝑞<sup>2</sup> < 16GeV<sup>2</sup>. The results are among the most precise experimentalmeasurements of the angular observables for this decay and are compared to a variety of predictions based onthe standard model. Some of these predictions exhibit tension with the measurements.</p>