Precise measurement of the unitarity triangle angle β
Led by the Dortmund working group, the LHCb collaboration unveiled a pivotal discovery at CERN today. Analyzing the full breadth of Run 2 data, they achieved unmatched precision in measuring the sin2β observable, crucial for determining the angle β of the 'unitarity triangle'.
The initial measurements of sin2β by the BaBar and Belle experiments were instrumental in the awarding of the 2008 Nobel Prize in Physics. Today's announcement, detailing LHCb researchers' value of S/sin2β=0.716±0.013±0.008, stands as the most accurate measurement of the unitarity angle β thus far, marking a significant stride in particle physics.