https://doi.org/10.1140/epjc/s10052-024-13217-3
Regular Article – Theoretical Physics
Prospect for measurement of the CP-violating phase
in the
channel at a future Z factory
1
Science and Technology on Nuclear Data Laboratory, China Institute of Atomic Energy, Beijing, China
2
Institute of High Energy Physics, Chinese Academy of Sciences, Beijing, China
3
Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark
Received:
14
August
2023
Accepted:
11
August
2024
Published online:
27
August
2024
The CP-violating phase , the
decay width (
), and the
decay width difference (
) are sensitive probes to new physics and can constrain the heavy quark expansion theory. The potential for the measurement at future Z factories is studied in this manuscript. It is found that operating at Tera-Z mode, the expected precision can reach:
,
and
. The precision of
is 40% larger than the expected precision with the LHCb experiment at HL-LHC. If operating at 10-Tera-Z mode, the precision of
can be measured at 45% of the precision obtained from the LHCb experiment at HL-LHC. However, the measurement of
and
cannot benefit from the excellent time resolution and tagging power of the future Z-factories. Only operating at 10-Tera-Z mode can the
and
reach an 18% larger precision than the precision expected to be obtained from LHCb at HL-LHC. The control of penguin contamination at the future Z-factories is also discussed.
© The Author(s) 2024
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