Search for the CP-violating decays $\Upsilon(4S) B0\bar{B}0 J/K0_S + J/\psi(\eta_c)K0_S$

TL;DR

This study conducted the first search for CP-violating decays of the $S$ meson using a large data sample, setting an upper limit on the decay rate and projecting future observability at a super B factory.

Contribution

It introduces a novel search for CP violation in $S$ decays and establishes an upper limit on the branching fraction, demonstrating potential for future detection.

Findings

No significant CP-violating signals observed.

Upper limit of $4 imes 10^{-7}$ on branching fractions.

Future experiments could observe these decays with more data.

Abstract

We report the first search for CP violating decays of the $\Upsilon(4S)$ using a data sample that contains 535 million $\Upsilon(4S)$ mesons with the Belle detector at the KEKB asymmetric-energy e^+ e^- collider. A partial reconstruction technique is employed to enhance the signal sensitivity. No significant signals were observed. We obtain an upper limit of $4 \times 10^{-7}$ at the 90 % confidence level for the branching fractions of the $CP$ violating modes, $\Upsilon(4S) \to B^0\bar{B}^0 \to J/\psi K^0_S + J/\psi(\eta_c) K^0_S$. Extrapolating the result, we find that an observation with 5$\sigma$ significance is expected with a 30 ab^{-1} data sample, which is within the reach of a future super B factory.