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Zenodo
2026
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| Online Access: | https://doi.org/10.5281/zenodo.20128864 |
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Table of Contents:
- <p>Supplemental material for the paper: </p> <p>Belle II Collaboration,<br>"Measurements of the mass difference m(B0) - m(B+) and the energy dependence of the cross-section ratio sigma(e+e- -> B0B0bar) / sigma(e+e- -> B+B-) at Belle and Belle II,"<br>[arXiv:2511.15926 [hep-ex]].</p> <p>There are two types of data files:<br> xsec.txt_* -- sum of B0B0bar and B+B- dressed cross sections divided by the Born-level e+e- -> mu+mu- cross section (4*pi*alpha^2 / (3*E_cm^2)).<br> rat.txt_* -- ratio of B0B0bar and B+B- dressed cross sections.</p> <p>Each data file contains 500 numbers corresponding to the values of the fit function evaluated at the centers of 500 histogram bins between Emin = 10.554 GeV and Emax = 10.604 GeV. Thus, the energy step between adjacent points is 0.1 MeV.</p> <p>The dressed cross sections correspond to Eqs. (5.1) and (5.2) of the paper and do not include the effect of the e+e- energy spread.</p> <p>The values of the cross-section ratio are provided only up to E = 10.59 GeV; above this energy the ratio is set to zero, since the combined fit does not constrain the ratio at higher energies.</p> <p>The nominal fit results are provided in the files:<br> xsec.txt_ref<br> rat.txt_ref</p> <p>Fit results for Monte Carlo pseudoexperiments are provided in the directory "toy/". The directory contains results for 1000 pseudoexperiments, with two files per pseudoexperiment:<br> rat.txt_N<br> xsec.txt_N</p> <p>The dm = m(B0) - m(B+) value is fixed in the fits to the pseudoexperiments, and its uncertainty is taken into account as a systematic uncertainty.</p> <p>We also provide fit results corresponding to the main sources of systematic uncertainty:<br> abs_rat -- uncertainty in the absolute value of Rv (Eq. (5.2));<br> dm -- uncertainty in dm;<br> mbp -- uncertainty in m(B+).<br><br>The files with suffixes "+" and "-" correspond to shifts of the corresponding parameters by +1 and -1 standard deviation, respectively.</p>