Journal of High Energy Physics (Feb 2020)

Measurement of D 0 − D ¯ $$ {D}^0-\overline{D} $$ 0 Mixing Parameters Using Semileptonic Decays of Neutral Kaon

  • P. Pakhlov,
  • V. Popov

DOI
https://doi.org/10.1007/JHEP02(2020)160
Journal volume & issue
Vol. 2020, no. 2
pp. 1 – 15

Abstract

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Abstract We propose a new method to extract D 0 − D ¯ $$ {D}^0-\overline{D} $$ 0 mixing parameters using the D 0 → K ¯ $$ \overline{K} $$ 0 π 0 decay with the K ¯ $$ \overline{K} $$ 0 reconstructed in the semileptonic mode. Although a K 0 → π ± ℓ ∓ v ℓ decay suffers from low statistics and complexity of the secondary vertex reconstruction in comparison to the standard K S 0 → π + π − $$ {K}_S^0\to {\pi}^{+}{\pi}^{-} $$ vertex, it provides much richer, sometimes unique information about the initial state of a K 0-meson produced in a heavy-flavor hadron decay. In this paper it is shown that the reconstruction of the chain D 0 → K 0(π ± ℓ ∓ v ℓ )π 0 allows one to extract the strong phase difference between the doubly Cabibbo-suppressed and Cabibbo-favored decay amplitudes, which is of key importance for determination of the D 0 − D ¯ $$ {D}^0-\overline{D} $$ 0 -mixing parameters.

Keywords