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We report the results of the first search for Standard Model and baryon-number-violating two-body decays of the neutral <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>B</a:mi></a:math> mesons to <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:msup><c:mi mathvariant="normal">Λ</c:mi><c:mn>0</c:mn></c:msup></c:math> and <f:math xmlns:f="http://www.w3.org/1998/Math/MathML" display="inline"><f:mrow><f:msubsup><f:mrow><f:mi mathvariant="normal">Ω</f:mi></f:mrow><f:mrow><f:mi>c</f:mi></f:mrow><f:mrow><f:mo stretchy="false">(</f:mo><f:mo>*</f:mo><f:mo stretchy="false">)</f:mo><f:mn>0</f:mn></f:mrow></f:msubsup></f:mrow></f:math> using <k:math xmlns:k="http://www.w3.org/1998/Math/MathML" display="inline"><k:mrow><k:mn>711</k:mn><k:mtext> </k:mtext><k:mtext> </k:mtext><k:msup><k:mrow><k:mi>fb</k:mi></k:mrow><k:mrow><k:mo>−</k:mo><k:mn>1</k:mn></k:mrow></k:msup></k:mrow></k:math> of data collected at the <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" display="inline"><m:mi mathvariant="normal">ϒ</m:mi><m:mo stretchy="false">(</m:mo><m:mn>4</m:mn><m:mi>S</m:mi><m:mo stretchy="false">)</m:mo></m:math> resonance with the Belle detector at the KEKB asymmetric-energy <r:math xmlns:r="http://www.w3.org/1998/Math/MathML" display="inline"><r:msup><r:mi>e</r:mi><r:mo>+</r:mo></r:msup><r:msup><r:mi>e</r:mi><r:mo>−</r:mo></r:msup></r:math> collider. We observe no evidence of signal from any such decays and set 95% confidence-level upper limits on the products of <t:math xmlns:t="http://www.w3.org/1998/Math/MathML" display="inline"><t:msup><t:mi>B</t:mi><t:mn>0</t:mn></t:msup></t:math> and <v:math xmlns:v="http://www.w3.org/1998/Math/MathML" display="inline"><v:mrow><v:msup><v:mrow><v:mrow><v:mover accent="true"><v:mrow><v:mi>B</v:mi></v:mrow><v:mrow><v:mo stretchy="false">¯</v:mo></v:mrow></v:mover></v:mrow></v:mrow><v:mrow><v:mn>0</v:mn></v:mrow></v:msup></v:mrow></v:math> branching fractions for these two-body decays with <z:math xmlns:z="http://www.w3.org/1998/Math/MathML" display="inline"><z:mrow><z:mi mathvariant="script">B</z:mi><z:mo stretchy="false">(</z:mo><z:msubsup><z:mrow><z:mi mathvariant="normal">Ω</z:mi></z:mrow><z:mrow><z:mi>c</z:mi></z:mrow><z:mrow><z:mn>0</z:mn></z:mrow></z:msubsup><z:mo stretchy="false">→</z:mo><z:msup><z:mrow><z:mi>π</z:mi></z:mrow><z:mrow><z:mo>+</z:mo></z:mrow></z:msup><z:msup><z:mrow><z:mi mathvariant="normal">Ω</z:mi></z:mrow><z:mrow><z:mo>−</z:mo></z:mrow></z:msup><z:mo stretchy="false">)</z:mo></z:mrow></z:math> in the range between <hb:math xmlns:hb="http://www.w3.org/1998/Math/MathML" display="inline"><hb:mn>9.5</hb:mn><hb:mo>×</hb:mo><hb:msup><hb:mn>10</hb:mn><hb:mrow><hb:mo>−</hb:mo><hb:mn>8</hb:mn></hb:mrow></hb:msup></hb:math> and <jb:math xmlns:jb="http://www.w3.org/1998/Math/MathML" display="inline"><jb:mn>31.2</jb:mn><jb:mo>×</jb:mo><jb:msup><jb:mn>10</jb:mn><jb:mrow><jb:mo>−</jb:mo><jb:mn>8</jb:mn></jb:mrow></jb:msup></jb:math>.
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Savinov et al. (2024) studied this question.
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