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<p>We investigate the physics reach and potential for the study of <i>B</i>-meson decays to invisible final states at the Future Circular Collider running electron-positron collisions at the <i>Z</i> pole (FCC-ee). Signal and background candidates are simulated for a proposed multipurpose detector, including inclusive contributions from <i>Z</i> decays to leptons or quarks. Signal candidates are selected by a mixture of rectangular cuts and a multiclass boosted decision tree classifier.</p><p>We determine that branching fractions above 7<i>.</i>6 <i>×</i> 10<sup><i>−</i>9</sup> (9<i>.</i>7 <i>×</i> 10<sup><i>−</i>9</sup>) would be excluded at 90% (95%) confidence level, and branching fractions above 3<i>.</i>0 <i>×</i> 10<sup><i>−</i>8</sup> would be within discovery reach at FCC-ee if 6 <i>×</i> 10<sup>12</sup> <i>Z</i> bosons are produced.</p>

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Prospects of searches for invisible B-meson decays at FCC-ee

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月1日

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  • P. Alvarez Cartelle,
  • M. Kenzie,
  • R. Mangrulkar,
  • A. R. Wiederhold,
  • E. Wood

摘要

We investigate the physics reach and potential for the study of B-meson decays to invisible final states at the Future Circular Collider running electron-positron collisions at the Z pole (FCC-ee). Signal and background candidates are simulated for a proposed multipurpose detector, including inclusive contributions from Z decays to leptons or quarks. Signal candidates are selected by a mixture of rectangular cuts and a multiclass boosted decision tree classifier.

We determine that branching fractions above 7.6 × 10−9 (9.7 × 10−9) would be excluded at 90% (95%) confidence level, and branching fractions above 3.0 × 10−8 would be within discovery reach at FCC-ee if 6 × 1012 Z bosons are produced.