Measurement of time-integrated $CP$ asymmetry in $D^{0}\rightarrow K^{0}_{S}K^{0}_{S}$.

Punzi G., Stracka S., Tuci G., Walsh J.
  Martedì 12/09   09:00 - 13:00   Aula A208   I - Fisica nucleare e subnucleare
$CP$ violation in charm has not yet been observed. The $D^{0}\rightarrow K^{0}_{S}K^{0}_{S}$ decay is a promising discovery channel for $CP$ violation in charm, because amplitudes are suppressed, a prediction based on Standard Model gives an upper limit for $CP$ asymmetry of 1.1% (C.L. 95%) and further enhancements could result from contributions from physics beyond the Standard Model. We present a measurement of $CP$ asymmetries in prompt $D^{0}\rightarrow K^{0}_{S}K^{0}_{S}$ decays, using data collected with LHCb experiment in 2015 and 2016 at a 13 TeV $pp$ center-of-mass energy (Run-2), improving the sensitivity obtained in Run-1.