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Measurement of the $$B^+/B^0$$ production ratio in $$e^+e^-$$ collisions at the $$Upsilon(4S)$$ resonance using $$B rightarrow J/psi(ellell) K$$ decays at Belle

Choudhury, S.*; 谷田 聖   ; Belle Collaboration*; 他198名*

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

We measure the ratio of branching fractions for the $$Upsilon (4S)$$ decays to $$B^+B^-$$ and $$B^0bar{B}{}^0$$ using $$B^+ rightarrow J/psi(ellell) K^+$$ and $$B^0 rightarrow J/psi(ellell) K^0$$ samples, where $$J/psi(ellell)$$ stands for $$J/psi to ell^+ell^-$$ ($$ell = e$$ or $$mu$$), with $$711$$ fb$$^{-1}$$ of data collected at the $$Upsilon(4S)$$ resonance with the Belle detector. We find the decay rate ratio of $$Upsilon(4S) rightarrow B^+B^-$$ over $$Upsilon(4S) rightarrow B^0bar{B}{}^0$$ to be $$1.065pm0.012pm 0.019 pm 0.047$$, 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 $$B to J/psi(ellell) K$$.

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パーセンタイル:79.48

分野:Astronomy & Astrophysics

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