First measurements of the branching fractions for the decay modes <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msubsup> <mml:mi mathvariant="normal">Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <m
Using data samples of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mn>988.4</a:mn> <a:mtext> </a:mtext> <a:mtext> </a:mtext> <a:msup> <a:mi>fb</a:mi> <a:mrow> <a:mo>−</a:mo> <a:mn>1</a:mn> </a:mrow> </a:msup> </a:math> and <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"> <c:mn>427.9</c:mn> <c:mtext> </c:mtext> <c:mtext> </c:mtext> <c:msup> <c:mi>fb</c:mi> <c:mrow> <c:mo>−</c:mo> <c:mn>1</c:mn> </c:mrow> </c:msup> </c:math> collected with the Belle and Belle II detectors, we present a study of the singly Cabibbo-suppressed decays <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"> <e:msubsup> <e:mi mathvariant="normal">Ξ</e:mi> <e:mi>c</e:mi> <e:mn>0</e:mn> </e:msubsup> <e:mo stretchy="false">→</e:mo> <e:mi mathvariant="normal">Λ</e:mi> <e:mi>η</e:mi> </e:math> , <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"> <j:mi mathvariant="normal">Λ</j:mi> <j:msup> <j:mi>η</j:mi> <j:mo>′</j:mo> </j:msup> </j:math> , and <m:math xmlns:m="http://www.w3.org/1998/Math/MathML" display="inline"> <m:mi mathvariant="normal">Λ</m:mi> <m:msup> <m:mi>π</m:mi> <m:mn>0</m:mn> </m:msup> </m:math> . We observe the decay <p:math xmlns:p="http://www.w3.org/1998/Math/MathML" display="inline"> <p:msubsup> <p:mi mathvariant="normal">Ξ</p:mi> <p:mi>c</p:mi> <p:mn>0</p:mn> </p:msubsup> <p:mo stretchy="false">→</p:mo> <p:mi mathvariant="normal">Λ</p:mi> <p:mi>η</p:mi> </p:math> and find evidence for the decay <u:math xmlns:u="http://www.w3.org/1998/Math/MathML" display="inline"> <u:msubsup> <u:mi mathvariant="normal">Ξ</u:mi> <u:mi>c</u:mi> <u:mn>0</u:mn> </u:msubsup> <u:mo stretchy="false">→</u:mo> <u:mi mathvariant="normal">Λ</u:mi> <u:msup> <u:mi>η</u:mi> <u:mo>′</u:mo> </u:msup> </u:math> , with corresponding branching ratios determined to be <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:mi mathvariant="normal">Ξ</z:mi> <z:mi>c</z:mi> <z:mn>0</z:mn> </z:msubsup> <z:mo stretchy="false">→</z:mo> <z:mi mathvariant="normal">Λ</z:mi> <z:mi>η</z:mi> <z:mo stretchy="false">)</z:mo> </z:mrow> <z:mo>/</z:mo> <z:mrow> <z:mi mathvariant="script">B</z:mi> <z:mo stretchy="false">(</z:mo> <z:msubsup> <z:mi mathvariant="normal">Ξ</z:mi> <z:mi>c</z:mi> <z:mn>0</z:mn> </z:msubsup> <z:mo stretchy="false">→</z:mo> <z:msup> <z:mi mathvariant="normal">Ξ</z:mi> <z:mo>−</z:mo> </z:msup> <z:msup> <z:mi>π</z:mi> <z:mo>+</z:mo> </z:msup> <z:mo stretchy="false">)</z:mo> </z:mrow> <z:mo>=</z:mo> <z:mo stretchy="false">(</z:mo> <z:mn>4.16</z:mn> <z:mo>±</z:mo> <z:mn>0.91</z:mn> <z:mo>±</z:mo> <z:mn>0.23</z:mn> <z:mo stretchy="false">)</z:mo> <z:mo>%</z:mo> </z:math> and <pb:math xmlns:pb="http://www.w3.org/1998/Math/MathML" display="inline"> <pb:mrow> <pb:mi mathvariant="script">B</pb:mi> <pb:mo stretchy="false">(</pb:mo> <pb:msubsup> <pb:mi mathvariant="normal">Ξ</pb:mi> <pb:mi>c</pb:mi> <pb:mn>0</pb:mn> </pb:msubsup> <pb:mo stretchy="false">→</pb:mo> <pb:mi mathvariant="normal">Λ</pb:mi> <pb:msup> <pb:mi>η</pb:mi> <pb:mo>′</pb:mo> </pb:msup> <pb:mo stretchy="false">)</pb:mo> </pb:mrow> <pb:mo>/</pb:mo> <pb:mrow> <pb:mi mathvariant="script">B</pb:mi> <pb:mo stretchy="false">(</pb:mo> <pb:msubsup> <pb:mi mathvariant="normal">Ξ</pb:mi> <pb:mi>c</pb:mi> <pb:mn>0</pb:mn> </pb:msubsup> <pb:mo stretchy="false">→</pb:mo> <pb:msup> <pb:mi mathvariant="normal">Ξ</pb:mi> <pb:mo>−</pb:mo> </pb:msup> <pb:msup> <pb:mi>π</pb:mi> <pb:mo>+</pb:mo> </pb:msup> <pb:mo stretchy="false">)</pb:mo> </pb:mrow> <pb:mo>=</pb:mo> <pb:mspace linebreak="goodbreak"/> <pb:mo stretchy="false">(</pb:mo> <pb:mn>2.48</pb:mn> <pb:mo>±</pb:mo> <pb:mn>0.82</pb:mn> <pb:mo>±</pb:mo> <pb:mn>0.12</pb:mn> <pb:mo stretchy="false">)</pb:mo> <pb:mo>%</pb:mo> </pb:math> , respectively. We find no significant signal in the <gc:math xmlns:gc="http://www.w3.org/1998/Math/MathML" display="inline"> <gc:msubsup> <gc:mi mathvariant="normal">Ξ</gc:mi> <gc:mi>c</gc:mi> <gc:mn>0</gc:mn> </gc:msubsup> <gc:mo stretchy="false">→</gc:mo> <gc:mi mathvariant="normal">Λ</gc:mi> <gc:msup> <gc:mi>π</gc:mi> <gc:mn>0</gc:mn> </gc:msup> </gc:math> decay mode and set an upper limit at the 90% credibility level of <lc:math xmlns:lc="http://www.w3.org/1998/Math/MathML" display="inline"> <lc:mrow> <lc:mi mathvariant="script">B</lc:mi> <lc:mo stretchy="false">(</lc:mo> <lc:msubsup> <lc:mi mathvariant="normal">Ξ</lc:mi> <lc:mi>c</lc:mi> <lc:mn>0</lc:mn> </lc:msubsup> <lc:mo stretchy="false">→</lc:mo> <lc:mi mathvariant="normal">Λ</lc:mi> <lc:msup> <lc:mi>π</lc:mi> <lc:mn>0</lc:mn> </lc:msup> <lc:mo stretchy="false">)</lc:mo> </lc:mrow> <lc:mo>/</lc:mo> <lc:mrow> <lc:mi mathvariant="script">B</lc:mi> <lc:mo stretchy="false">(</lc:mo> <lc:msubsup> <lc:mi mathvariant="normal">Ξ</lc:mi> <lc:mi>c</lc:mi> <lc:mn>0</lc:mn> </lc:msubsup> <lc:mo stretchy="false">→</lc:mo> <lc:msup> <lc:mi mathvariant="normal">Ξ</lc:mi> <l
Authors
- Y. Onuki (ORCID: https://orcid.org/0000-0002-1646-6847)
- Y. Sato (ORCID: https://orcid.org/0000-0003-3751-2803)
- Shinichi Ogawa
- M. Alhakami (ORCID: https://orcid.org/0000-0002-2234-8628)
- S. Longo (ORCID: https://orcid.org/0000-0002-8124-8969)
- C. Schwanda (ORCID: https://orcid.org/0000-0003-4844-5028)
- G. Gaudino (ORCID: https://orcid.org/0000-0001-5983-1552)
- H. Ghumaryan (ORCID: https://orcid.org/0000-0001-6775-8893)
- H. Svidras (ORCID: https://orcid.org/0000-0003-4198-2517)
- E. -J. Jang
- S. Hazra (ORCID: https://orcid.org/0000-0001-6954-9593)
- K. Yi (ORCID: https://orcid.org/0000-0002-8630-3031)
- S. Maity (ORCID: https://orcid.org/0000-0003-3076-9243)
- R. Okubo (ORCID: https://orcid.org/0009-0009-0912-0678)
- P. Cheema (ORCID: https://orcid.org/0000-0001-8472-5727)
- A. Beaubien (ORCID: https://orcid.org/0000-0001-9438-089X)
- L. Aggarwal (ORCID: https://orcid.org/0000-0002-0909-7537)
- C. Praz (ORCID: https://orcid.org/0000-0002-6154-885X)
- S. Kohani (ORCID: https://orcid.org/0000-0003-3869-6552)
- A. Lozar (ORCID: https://orcid.org/0000-0002-0569-6882)
- Michael H. Bartl (ORCID: https://orcid.org/0000-0002-6942-7075)
- D. Y. Kim
- C. Wessel (ORCID: https://orcid.org/0000-0003-0959-4784)
- M. Bessner (ORCID: https://orcid.org/0000-0003-1776-0439)
- R. Mehta (ORCID: https://orcid.org/0000-0001-8670-3409)
- M. Piccolo (ORCID: https://orcid.org/0000-0001-9750-0551)
- K. Matsuoka (ORCID: https://orcid.org/0000-0003-1706-9365)
- A. Rostomyan (ORCID: https://orcid.org/0000-0003-1839-8152)
- Lorenzo G. Vitale (ORCID: https://orcid.org/0000-0002-7166-1581)
- A. Baur
- I. Ripp-Baudot (ORCID: https://orcid.org/0000-0002-1897-8272)
- C. Hearty (ORCID: https://orcid.org/0000-0001-6568-0252)
- P. Stavroulakis (ORCID: https://orcid.org/0000-0001-9914-7261)
- G. Ghevondyan (ORCID: https://orcid.org/0000-0003-0096-3555)
- D. Shtol (ORCID: https://orcid.org/0000-0002-0622-6065)
- L. Cao (ORCID: https://orcid.org/0000-0001-8332-5668)
- R. Tiwary (ORCID: https://orcid.org/0000-0002-5887-1883)
- R. A. Briere (ORCID: https://orcid.org/0000-0001-5229-1039)
- P. Rados (ORCID: https://orcid.org/0000-0003-0690-8100)
- F. Otani
- A. Fodor (ORCID: https://orcid.org/0000-0002-2821-759X)
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Publication Details
- Journal
- Physical review. D/Physical review. D.
- Published
- 2026-01-14
- DOI
- https://doi.org/10.1103/q4n8-fqj1
- Citations
- 1
- Primary Topic
- Particle physics theoretical and experimental studies
- Type
- article
- Field-Weighted Citation Impact
- 27.96