Measurement of the production ratio in collisions at the resonance using decays at Belle

Choudhury, S.*; Tanida, Kiyoshi ; Belle Collaboration*; 198 of others*

We measure the ratio of branching fractions for the decays to and $B^0bar{B}{}^0$ using and samples, where stands for ( or ), with fb $^{-1}$ of data collected at the resonance with the Belle detector. We find the decay rate ratio of over $Upsilon(4S) rightarrow B^0bar{B}{}^0$ to be , which is the most precise measurement to date. The first and second uncertainties are statistical and systematic, respectively, and the third uncertainty is systematic due to the assumption of isospin symmetry in .

Language	:	English
Journal	:	Physical Review D
Volume	:	107
Number	:	3
Pages	:	p.L031102_1 - L031102_6
Publication Year/Month	:	2023/02
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Paper URL	:	https://doi.org/10.1103/PhysRevD.107.L031102
DOI for research data	:	Link to research data related to this paper/report.
Keywords	:	no keyword
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Registration No. : AA20240810
JAEA Abstracts No. : 53000317
Paper Submission No. : 29110

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