High Energy Physics Seminars

Analysis of KLOE data collected during the period 2001-2005 (integrated luminosity ∼2 fb⁻¹ continues to provide interesting physics results. A recently published upper limit on the branching ratio of the pure CP violating process BR(K_S → 3π⁰) < 2.6 × 10⁻⁸ is an order of magnitude larger than predictions based on the Standard Model. A search for CPT and Lorentz symmetry violation with φ → K_S K_L → π⁺π⁻π⁺π⁻ has allowed an independent measurement of all four CPT violating parameters, Δa_μ, appearing for neutral kaons in the Standard-Model Extension framework. The measurement of the e⁺e⁻ → π⁺π⁻(γ) cross section below 1 GeV provides important limits on the hadronic contribution to the Standard Model calculation of the g−2 of the muon, where a long standing 3σ discrepancy is observed. Additionally, KLOE is searching for a dark U boson in the processes φ → η e⁺e⁻ and e⁺e⁻ → μ⁺μ⁻γ. The KLOE-2 experiment is ready to begin taking data this fall.