Search for a bound state of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msub> <mml:mi mathvariant="normal">Λ</mml:mi> <mml:mi>c</mml:mi> </mml:msub> <mml:msub> <mml:mover accent="true"> <mml:mi mathvariant="normal"

We search for a possible <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:msub> <a:mi mathvariant="normal">Λ</a:mi> <a:mi>c</a:mi> </a:msub> <a:msub> <a:mover accent="true"> <a:mi mathvariant="normal">Σ</a:mi> <a:mo stretchy="false">¯</a:mo> </a:mover> <a:mi>c</a:mi> </a:msub> </a:math> bound state, denoted as <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"> <g:msubsup> <g:mi>H</g:mi> <g:mi>c</g:mi> <g:mo>±</g:mo> </g:msubsup> </g:math> , via the <i:math xmlns:i="http://www.w3.org/1998/Math/MathML" display="inline"> <i:msup> <i:mi>e</i:mi> <i:mo>+</i:mo> </i:msup> <i:msup> <i:mi>e</i:mi> <i:mo>−</i:mo> </i:msup> <i:mo stretchy="false">→</i:mo> <i:msup> <i:mi>π</i:mi> <i:mo>+</i:mo> </i:msup> <i:msup> <i:mi>π</i:mi> <i:mo>−</i:mo> </i:msup> <i:msubsup> <i:mi mathvariant="normal">Λ</i:mi> <i:mi>c</i:mi> <i:mo>+</i:mo> </i:msubsup> <i:msubsup> <i:mover accent="true"> <i:mi mathvariant="normal">Λ</i:mi> <i:mo stretchy="false">¯</i:mo> </i:mover> <i:mi>c</i:mi> <i:mo>−</i:mo> </i:msubsup> </i:math> process for the first time. This analysis utilizes 207.8 and <p:math xmlns:p="http://www.w3.org/1998/Math/MathML" display="inline"> <p:mn>159.3</p:mn> <p:mtext> </p:mtext> <p:mtext> </p:mtext> <p:msup> <p:mi>pb</p:mi> <p:mrow> <p:mo>−</p:mo> <p:mn>1</p:mn> </p:mrow> </p:msup> </p:math> of <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> annihilation data at the center-of-mass energies of 4918.02 and 4950.93 MeV, respectively, collected with the BESIII detector at the BEPCII collider. No statistically significant signal is observed. The upper limits of the product of Born cross section and branching fraction <t:math xmlns:t="http://www.w3.org/1998/Math/MathML" display="inline"> <t:mi>σ</t:mi> <t:mo stretchy="false">(</t:mo> <t:msup> <t:mi>e</t:mi> <t:mo>+</t:mo> </t:msup> <t:msup> <t:mi>e</t:mi> <t:mo>−</t:mo> </t:msup> <t:mo stretchy="false">→</t:mo> <t:msup> <t:mi>π</t:mi> <t:mo>+</t:mo> </t:msup> <t:msubsup> <t:mi>H</t:mi> <t:mi>c</t:mi> <t:mo>−</t:mo> </t:msubsup> <t:mo>+</t:mo> <t:mi mathvariant="normal">c</t:mi> <t:mo>.</t:mo> <t:mi mathvariant="normal">c</t:mi> <t:mo>.</t:mo> <t:mo stretchy="false">)</t:mo> <t:mo>×</t:mo> <t:mi mathvariant="script">B</t:mi> <t:mo stretchy="false">(</t:mo> <t:msubsup> <t:mi>H</t:mi> <t:mi>c</t:mi> <t:mo>−</t:mo> </t:msubsup> <t:mo stretchy="false">→</t:mo> <t:msup> <t:mi>π</t:mi> <t:mo>−</t:mo> </t:msup> <t:msubsup> <t:mi mathvariant="normal">Λ</t:mi> <t:mi>c</t:mi> <t:mo>+</t:mo> </t:msubsup> <t:msubsup> <t:mover accent="true"> <t:mi mathvariant="normal">Λ</t:mi> <t:mo stretchy="false">¯</t:mo> </t:mover> <t:mi>c</t:mi> <t:mo>−</t:mo> </t:msubsup> <t:mo stretchy="false">)</t:mo> </t:math> at a 90% confidence level are reported at each energy point and for various <ib:math xmlns:ib="http://www.w3.org/1998/Math/MathML" display="inline"> <ib:msub> <ib:mi>H</ib:mi> <ib:mi>c</ib:mi> </ib:msub> </ib:math> mass hypotheses (4715, 4720, 4725, 4730, and <kb:math xmlns:kb="http://www.w3.org/1998/Math/MathML" display="inline"> <kb:mn>4735</kb:mn> <kb:mtext> </kb:mtext> <kb:mtext> </kb:mtext> <kb:mi>MeV</kb:mi> <kb:mo>/</kb:mo> <kb:msup> <kb:mi>c</kb:mi> <kb:mn>2</kb:mn> </kb:msup> </kb:math> ) and widths (5, 10, or 20 MeV), with the upper limits ranging from 1.1 pb to 6.4 pb.

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Publication Details

Journal
Physical review. D/Physical review. D.
Published
2025-10-29
DOI
https://doi.org/10.1103/jv3m-h997
Primary Topic
Quantum Chromodynamics and Particle Interactions
Type
article
Field-Weighted Citation Impact
0.00
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article

Search for a bound state of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msub> <mml:mi mathvariant="normal">Λ</mml:mi> <mml:mi>c</mml:mi> </mml:msub> <mml:msub> <mml:mover accent="true"> <mml:mi mathvariant="normal"

Karl J. Friston
Physical review. D/Physical review. D.
Quantum Chromodynamics and Particle Interactions
article

Search for a bound state of <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:msub> <mml:mi mathvariant="normal">Λ</mml:mi> <mml:mi>c</mml:mi> </mml:msub> <mml:msub> <mml:mover accent="true"> <mml:mi mathvariant="normal"

Karl J. Friston
article en

Abstract

We search for a possible <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:msub> <a:mi mathvariant="normal">Λ</a:mi> <a:mi>c</a:mi> </a:msub> <a:msub> <a:mover accent="true"> <a:mi mathvariant="normal">Σ</a:mi> <a:mo stretchy="false">¯</a:mo> </a:mover> <a:mi>c</a:mi> </a:msub> </a:math> bound state, denoted as <g:math xmlns:g="http://www.w3.org/1998/Math/MathML" display="inline"> <g:msubsup> <g:mi>H</g:mi> <g:mi>c</g:mi> <g:mo>±</g:mo> </g:msubsup> </g:math> , via the <i:math xmlns:i="http://www.w3.org/1998/Math/MathML" display="inline"> <i:msup> <i:mi>e</i:mi> <i:mo>+</i:mo> </i:msup> <i:msup> <i:mi>e</i:mi> <i:mo>−</i:mo> </i:msup> <i:mo stretchy="false">→</i:mo> <i:msup> <i:mi>π</i:mi> <i:mo>+</i:mo> </i:msup> <i:msup> <i:mi>π</i:mi> <i:mo>−</i:mo> </i:msup> <i:msubsup> <i:mi mathvariant="normal">Λ</i:mi> <i:mi>c</i:mi> <i:mo>+</i:mo> </i:msubsup> <i:msubsup> <i:mover accent="true"> <i:mi mathvariant="normal">Λ</i:mi> <i:mo stretchy="false">¯</i:mo> </i:mover> <i:mi>c</i:mi> <i:mo>−</i:mo> </i:msubsup> </i:math> process for the first time. This analysis utilizes 207.8 and <p:math xmlns:p="http://www.w3.org/1998/Math/MathML" display="inline"> <p:mn>159.3</p:mn> <p:mtext> </p:mtext> <p:mtext> </p:mtext> <p:msup> <p:mi>pb</p:mi> <p:mrow> <p:mo>−</p:mo> <p:mn>1</p:mn> </p:mrow> </p:msup> </p:math> of <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> annihilation data at the center-of-mass energies of 4918.02 and 4950.93 MeV, respectively, collected with the BESIII detector at the BEPCII collider. No statistically significant signal is observed. The upper limits of the product of Born cross section and branching fraction <t:math xmlns:t="http://www.w3.org/1998/Math/MathML" display="inline"> <t:mi>σ</t:mi> <t:mo stretchy="false">(</t:mo> <t:msup> <t:mi>e</t:mi> <t:mo>+</t:mo> </t:msup> <t:msup> <t:mi>e</t:mi> <t:mo>−</t:mo> </t:msup> <t:mo stretchy="false">→</t:mo> <t:msup> <t:mi>π</t:mi> <t:mo>+</t:mo> </t:msup> <t:msubsup> <t:mi>H</t:mi> <t:mi>c</t:mi> <t:mo>−</t:mo> </t:msubsup> <t:mo>+</t:mo> <t:mi mathvariant="normal">c</t:mi> <t:mo>.</t:mo> <t:mi mathvariant="normal">c</t:mi> <t:mo>.</t:mo> <t:mo stretchy="false">)</t:mo> <t:mo>×</t:mo> <t:mi mathvariant="script">B</t:mi> <t:mo stretchy="false">(</t:mo> <t:msubsup> <t:mi>H</t:mi> <t:mi>c</t:mi> <t:mo>−</t:mo> </t:msubsup> <t:mo stretchy="false">→</t:mo> <t:msup> <t:mi>π</t:mi> <t:mo>−</t:mo> </t:msup> <t:msubsup> <t:mi mathvariant="normal">Λ</t:mi> <t:mi>c</t:mi> <t:mo>+</t:mo> </t:msubsup> <t:msubsup> <t:mover accent="true"> <t:mi mathvariant="normal">Λ</t:mi> <t:mo stretchy="false">¯</t:mo> </t:mover> <t:mi>c</t:mi> <t:mo>−</t:mo> </t:msubsup> <t:mo stretchy="false">)</t:mo> </t:math> at a 90% confidence level are reported at each energy point and for various <ib:math xmlns:ib="http://www.w3.org/1998/Math/MathML" display="inline"> <ib:msub> <ib:mi>H</ib:mi> <ib:mi>c</ib:mi> </ib:msub> </ib:math> mass hypotheses (4715, 4720, 4725, 4730, and <kb:math xmlns:kb="http://www.w3.org/1998/Math/MathML" display="inline"> <kb:mn>4735</kb:mn> <kb:mtext> </kb:mtext> <kb:mtext> </kb:mtext> <kb:mi>MeV</kb:mi> <kb:mo>/</kb:mo> <kb:msup> <kb:mi>c</kb:mi> <kb:mn>2</kb:mn> </kb:msup> </kb:math> ) and widths (5, 10, or 20 MeV), with the upper limits ranging from 1.1 pb to 6.4 pb.

Physical review. D/Physical review. D.Vol. 112(11)
University of Science and Technology Liaoning (CN), Liaoning University (CN), Università degli Studi del Piemonte Orientale “Amedeo Avogadro” (IT), Uppsala University (SE), University of Science and Technology of China (CN), University of Hawaii System (US), Mongolian Academy of Sciences (MN), Central South University (CN), Guangxi University (CN), Nanjing Normal University (CN), Liaoning Normal University (CN), North China Electric Power University (CN), Shandong University (CN), COMSATS University Islamabad (PK), Hangzhou Normal University (CN), Hunan University (CN), Henan University of Science and Technology (CN), University of Groningen (NL), GSI Helmholtz Centre for Heavy Ion Research (DE), University of the Punjab (PK), Hunan Normal University (CN), Henan University (CN), Shanghai Jiao Tong University (CN), Yantai University (CN), University of Tarapacá (CL), Guangxi University of Science and Technology (CN), South China Normal University (CN), Yunnan University (CN), Jilin University (CN), Johannes Gutenberg University Mainz (DE), Justus-Liebig-Universität Gießen (DE), University of Ferrara (IT), Qufu Normal University (CN), Peking University (CN), Nankai University (CN), University of Münster (DE), Sichuan University (CN), Fudan University (CN), Inner Mongolia University (CN), University of Perugia (IT), Shandong Normal University (CN), University of Manchester (GB), Guangxi Normal University (CN), China University of Geosciences (CN), Huangshan University (CN), Joint Institute for Nuclear Research (RU), University of Jinan (CN), Henan University of Technology (CN), University of Bristol (GB), Wuhan University (CN), Zhengzhou University (CN), University of Oxford (GB), Central China Normal University (CN), National Centre for Nuclear Research (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT), Helmholtz Institute Mainz (DE), Istinye University (TR), Institute of Modern Physics (CN), Jilin Medical University (CN), Shanxi University of Traditional Chinese Medicine (CN), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Piedmont University (US), Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (IT), University of Chinese Academy of Sciences (CN), Hebei University (CN), Budker Institute of Nuclear Physics (RU), China Center of Advanced Science and Technology (CN), University of Turin (IT), Indiana University (US), Chung-Ang University (KR), Near East University (CY), Carnegie Mellon University (US), Henan Normal University (CN), Zhejiang University (CN), Lanzhou University (CN), Renmin University of China (CN), Suranaree University of Technology (TH), Beihang University (CN), Nanjing University (CN), Ruhr University Bochum (DE), University of South China (CN), Shanxi Normal University (CN), Tsinghua University (CN)
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