Measurements of the mass difference m(B$^{0}$) − m(B$^{+}$) and the energy dependence of the cross-section ratio $\sigma ({e}^{+}{e}^{-}\to {B}^{0}{\overline{B} }^{0})/\sigma ({e}^{+}{e}^{-}\to {B}^{+}{B}^{-})$ at Belle and Belle II
M. Abumusabh, I. Adachi, L. Aggarwal, H. Ahmed et autres
Using data samples collected by the Belle and Belle II experiments at the Υ(4S) resonance with integrated luminosities of 571 fb$^{−1}$ and 365 fb$^{−1}$, respectively, we measure the pseudoscalar B-meson mass difference to be m(B$^{0}$) − m(B$^{+}$) = (0.495 ± 0.024 ± …
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arXiv (Cornell University)