Abstract
We report the first search for the penguin-dominated process Bs0→η′Xss¯ using a semi-inclusive method. A 121.4 fb−1 integrated luminosity ϒ(5S) data set collected by the Belle experiment, at the KEKB asymmetric-energy e+e− collider, is used. We observe no statistically significant signal and, including all uncertainties, we set a 90% confidence level upper limit on the partial branching fraction at 1.4×10−3 for M(Xss¯)≤2.4 GeV/c2.Received 19 February 2021Accepted 4 June 2021DOI:https://doi.org/10.1103/PhysRevD.104.012007Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBranching fractionFlavor changing neutral currentsHadronic decaysRare decaysPhysical SystemsBottom quarkLight mesonsPropertiesFlavor symmetriesTechniquesLepton collidersMulti-purpose particle detectorsParticle decaysParticles & Fields
Highlights
We report the first search for the penguin-dominated process B0s → η0Xssusing a semi-inclusive method
We report the first search for the decay B0s → η0Xssusing a semi-inclusive method [15]
To obtapinffiffiaffiffiffiffisffiffipffiffiffieffi cific ONN selection, the figure-of-merit (FOM) S= S þ B is optimized as a function of ONN, where S and B are the fitted signal and background yields from an Monte Carlo (MC) sample that is passed through the trained network
Summary
“model” refers to the fragmentation uncertainty of the Xs. Belle previously measured the BF for the related process B → ηXs as BðB → ηXsÞ 1⁄4 1⁄226.1 Æ. An iron flux-return located outside of the coil is instrumented to detect
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