Search for the lepton number violating decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>η</mml:mi> <mml:mo stretchy="false">→</mml:mo> <mml:msup> <mml:mrow> <mml:mi>π</mml:mi> </mml:mrow> <mml:mrow>

Based on a sample of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mrow> <a:mo stretchy="false">(</a:mo> <a:mn>10.087</a:mn> <a:mo>±</a:mo> <a:mn>0.044</a:mn> <a:mo stretchy="false">)</a:mo> <a:mo>×</a:mo> <a:msup> <a:mrow> <a:mn>10</a:mn> </a:mrow> <a:mrow> <a:mn>9</a:mn> </a:mrow> </a:msup> <a:mi>J</a:mi> <a:mo>/</a:mo> <a:mi>ψ</a:mi> </a:mrow> </a:math> events collected by the BESIII detector at the BEPCII collider, we perform the first search for the lepton number violating decay <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"> <e:mrow> <e:mi>η</e:mi> <e:mo stretchy="false">→</e:mo> <e:msup> <e:mrow> <e:mi>π</e:mi> </e:mrow> <e:mrow> <e:mo>+</e:mo> </e:mrow> </e:msup> <e:msup> <e:mrow> <e:mi>π</e:mi> </e:mrow> <e:mrow> <e:mo>+</e:mo> </e:mrow> </e:msup> <e:msup> <e:mrow> <e:mi>e</e:mi> </e:mrow> <e:mrow> <e:mo>−</e:mo> </e:mrow> </e:msup> <e:msup> <e:mrow> <e:mi>e</e:mi> </e:mrow> <e:mrow> <e:mo>−</e:mo> </e:mrow> </e:msup> <e:mo>+</e:mo> <e:mi mathvariant="normal">c</e:mi> <e:mo>.</e:mo> <e:mi mathvariant="normal">c</e:mi> </e:mrow> </e:math> . No signal is found, and an upper limit on the branching fraction of <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"> <j:mrow> <j:mi>η</j:mi> <j:mo stretchy="false">→</j:mo> <j:msup> <j:mrow> <j:mi>π</j:mi> </j:mrow> <j:mrow> <j:mo>+</j:mo> </j:mrow> </j:msup> <j:msup> <j:mrow> <j:mi>π</j:mi> </j:mrow> <j:mrow> <j:mo>+</j:mo> </j:mrow> </j:msup> <j:msup> <j:mrow> <j:mi>e</j:mi> </j:mrow> <j:mrow> <j:mo>−</j:mo> </j:mrow> </j:msup> <j:msup> <j:mrow> <j:mi>e</j:mi> </j:mrow> <j:mrow> <j:mo>−</j:mo> </j:mrow> </j:msup> <j:mo>+</j:mo> <j:mi mathvariant="normal">c</j:mi> <j:mo>.</j:mo> <j:mi mathvariant="normal">c</j:mi> <j:mo>.</j:mo> </j:mrow> </j:math> is set to be <o:math xmlns:o="http://www.w3.org/1998/Math/MathML" display="inline"> <o:mn>4.6</o:mn> <o:mo>×</o:mo> <o:msup> <o:mn>10</o:mn> <o:mrow> <o:mo>−</o:mo> <o:mn>6</o:mn> </o:mrow> </o:msup> </o:math> at the 90% confidence level.

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Publication Details

Journal
Physical review. D/Physical review. D.
Published
2025-12-03
DOI
https://doi.org/10.1103/3sf4-51f1
Primary Topic
Particle physics theoretical and experimental studies
Type
article
Field-Weighted Citation Impact
0.00
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article

Search for the lepton number violating decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>η</mml:mi> <mml:mo stretchy="false">→</mml:mo> <mml:msup> <mml:mrow> <mml:mi>π</mml:mi> </mml:mrow> <mml:mrow>

Karl J. Friston
Physical review. D/Physical review. D.
Particle physics theoretical and experimental studies
article

Search for the lepton number violating decay <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow> <mml:mi>η</mml:mi> <mml:mo stretchy="false">→</mml:mo> <mml:msup> <mml:mrow> <mml:mi>π</mml:mi> </mml:mrow> <mml:mrow>

Karl J. Friston
article en

Abstract

Based on a sample of <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"> <a:mrow> <a:mo stretchy="false">(</a:mo> <a:mn>10.087</a:mn> <a:mo>±</a:mo> <a:mn>0.044</a:mn> <a:mo stretchy="false">)</a:mo> <a:mo>×</a:mo> <a:msup> <a:mrow> <a:mn>10</a:mn> </a:mrow> <a:mrow> <a:mn>9</a:mn> </a:mrow> </a:msup> <a:mi>J</a:mi> <a:mo>/</a:mo> <a:mi>ψ</a:mi> </a:mrow> </a:math> events collected by the BESIII detector at the BEPCII collider, we perform the first search for the lepton number violating decay <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"> <e:mrow> <e:mi>η</e:mi> <e:mo stretchy="false">→</e:mo> <e:msup> <e:mrow> <e:mi>π</e:mi> </e:mrow> <e:mrow> <e:mo>+</e:mo> </e:mrow> </e:msup> <e:msup> <e:mrow> <e:mi>π</e:mi> </e:mrow> <e:mrow> <e:mo>+</e:mo> </e:mrow> </e:msup> <e:msup> <e:mrow> <e:mi>e</e:mi> </e:mrow> <e:mrow> <e:mo>−</e:mo> </e:mrow> </e:msup> <e:msup> <e:mrow> <e:mi>e</e:mi> </e:mrow> <e:mrow> <e:mo>−</e:mo> </e:mrow> </e:msup> <e:mo>+</e:mo> <e:mi mathvariant="normal">c</e:mi> <e:mo>.</e:mo> <e:mi mathvariant="normal">c</e:mi> </e:mrow> </e:math> . No signal is found, and an upper limit on the branching fraction of <j:math xmlns:j="http://www.w3.org/1998/Math/MathML" display="inline"> <j:mrow> <j:mi>η</j:mi> <j:mo stretchy="false">→</j:mo> <j:msup> <j:mrow> <j:mi>π</j:mi> </j:mrow> <j:mrow> <j:mo>+</j:mo> </j:mrow> </j:msup> <j:msup> <j:mrow> <j:mi>π</j:mi> </j:mrow> <j:mrow> <j:mo>+</j:mo> </j:mrow> </j:msup> <j:msup> <j:mrow> <j:mi>e</j:mi> </j:mrow> <j:mrow> <j:mo>−</j:mo> </j:mrow> </j:msup> <j:msup> <j:mrow> <j:mi>e</j:mi> </j:mrow> <j:mrow> <j:mo>−</j:mo> </j:mrow> </j:msup> <j:mo>+</j:mo> <j:mi mathvariant="normal">c</j:mi> <j:mo>.</j:mo> <j:mi mathvariant="normal">c</j:mi> <j:mo>.</j:mo> </j:mrow> </j:math> is set to be <o:math xmlns:o="http://www.w3.org/1998/Math/MathML" display="inline"> <o:mn>4.6</o:mn> <o:mo>×</o:mo> <o:msup> <o:mn>10</o:mn> <o:mrow> <o:mo>−</o:mo> <o:mn>6</o:mn> </o:mrow> </o:msup> </o:math> at the 90% confidence level.

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), Indian Institute of Technology Madras (IN), 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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