Reconstructing $$K^0_S$$ and $$\varLambda $$ in the CEPC baseline detector

Abstract

The proposed Circular Electron Positron Collider (CEPC) is expected to produce up to 1 trillion Z bosons in 2 years and has a great potential on the flavor physics. The $$K^0_S$$ and $$\varLambda $$ are important physics signatures for many flavor physics measurements and are abundantly produced in the CEPC Z pole program. Using a full simulation tool, we study the CEPC baseline detector performance of the $$K^0_S/\varLambda $$ reconstruction with fully charged final states. For the $$K^0_S/\varLambda $$, the baseline detector reaches an inclusive efficiency/purity of $$40.6/92.4\%$$ and $$27.3/86.4\%$$, and a mass resolution of 1.20/0.40 (0.24/0.036%) MeV, respectively. We also quantify the potential improvements, by improving the low transverse momentum track reconstruction and implementing particle identification capabilities in ideal conditions. In addition, we discuss the potential application on the detector material and alignment studies.