Measurement of the CP-even fraction of D0 → K+K−π+π−

• A determination of the CP-even fraction F+ in the decay D0→K+K−π+π− is presented. Using 2.93  fb−1 of e+e−→ψ(3770)→D¯D data collected by the BESIII detector, one charm meson is reconstructed in the signal mode and the other in a CP eigenstate or the decay D→K0S,Lπ+π−. Analysis of the relative rates of these double-tagged events yields the result F+=0.730±0.037±0.021, where the first uncertainty is statistical and the second is systematic. This is the first model-independent measurement of F+ in D0→K+K−π+π− decays.

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NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

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