Search for invisible decays of the Λ baryon

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ahmed, S.; Albrecht, M.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, X. H.; Bai, Y.; Bakina, O.; Baldini Ferroli, R.; Balossino, I.; Ban, Y.; Begzsuren, K.; Berger, N.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bloms, J.; Bortone, A.; Boyko, I.; Briere, R. A.; Cai, H.; Cai, X.; Calcaterra, A.; Cao, G. F.; Cao, N.; Cetin, S. A.; Chang, J. F.; Chang, W. L.; Chelkov, G.; Chen, D. Y.; Chen, G.; Chen, H. S.; Chen, M. L.; Chen, S. J.; Chen, X. R.; Chen, Y. B.; Chen, Z. J.; Cheng, W. S.; Cibinetto, G.; Cossio, F.; Cui, X. F.; Dai, H. L.; Dai, X. C.; Dbeyssi, A.; de Boer, R. E.; Dedovich, D.; Deng, Z. Y.; Denig, A.; Denysenko, I.; Destefanis, M.; De Mori, F.; Ding, Y.; Dong, C.; Dong, J.; Dong, L. Y.; Dong, M. Y.; Dong, X.; Du, S. X.; Fan, Y. L.; Fang, J.; Fang, S. S.; Fang, Y.; Farinelli, R.; Fava, L.; Feldbauer, F.; Felici, G.; Feng, C. Q.; Feng, J. H.; Fritsch, M.; Fu, C. D.; Gao, Y.; Gao, Y.; Gao, Y.; Gao, Y. G.; Garzia, I.; Ge, P. T.; Geng, C.; Gersabeck, E. M.; Gilman, A.; Goetzen, K.; Gong, L.; Gong, W. X.; Gradl, W.; Greco, M.; Gu, L. M.; Gu, M. H.; Guan, C. Y.; Guo, A. Q.; Guo, L. B.; Guo, R. P.; Guo, Y. P.; Guskov, A.; Han, T. T.; Han, W. Y.; Hao, X. Q.; Harris, F. A.; He, K. L.; Heinsius, F. H.; Heinz, C. H.; Heng, Y. K.; Herold, C.; Himmelreich, M.; Holtmann, T.; Hou, G. Y.; Hou, Y. R.; Hou, Z. L.; Hu, H. M.; Hu, J. F.; Hu, T.; Hu, Y.; Huang, G. S.; Huang, L. Q.; Huang, X. T.; Huang, Y. P.; Huang, Z.; Hussain, T.; Hüsken, N.; Ikegami Andersson, W.; Imoehl, W.; Irshad, M.; Jaeger, S.; Janchiv, S.; Ji, Q.; Ji, Q. P.; Ji, X. B.; Ji, X. L.; Ji, Y. Y.; Jiang, H. B.; Jiang, X. S.; Jiao, J. B.; Jiao, Z.; Jin, S.; Jin, Y.; Jing, M. Q.; Johansson, T.; Kalantar-Nayestanaki, N.; Kang, X. S.; Kappert, R.; Kavatsyuk, M.; Ke, B. C.; Keshk, I. K.; Khoukaz, A.; Kiese, P.; Kiuchi, R.; Kliemt, R.; Koch, L.; Kolcu, O. B.; Kopf, B.; Kuemmel, M.; Kuessner, M.; Kupsc, A.; Kurth, M. G.; Kühn, W.; Lane, J. J.; Lange, J. S.; Larin, P.; Lavania, A.; Lavezzi, L.; Lei, Z. H.; Leithoff, H.; Lellmann, M.; Lenz, T.; Li, C.; Li, C. H.; Li, Cheng; Li, D. M.; Li, F.; Li, G.; Li, H.; Li, H.; Li, H. B.; Li, H. J.; Li, J. L.; Li, J. Q.; Li, J. S.; Li, Ke; Li, L. K.; Li, Lei; Li, P. R.; Li, S. Y.; Li, W. D.; Li, W. G.; Li, X. H.; Li, X. L.; Li, Xiaoyu; Li, Z. Y.; Liang, H.; Liang, H.; Liang, H.; Liang, Y. F.; Liang, Y. T.; Liao, G. R.; Liao, L. Z.; Libby, J.; Limphirat, A.; Lin, C. X.; Lin, T.; Liu, B. J.; Liu, C. X.; Liu, D.; Liu, F. H.; Liu, Fang; Liu, Feng; Liu, H. M.; Liu, Huanhuan; Liu, Huihui; Liu, J. B.; Liu, J. L.; Liu, J. Y.; Liu, K.; Liu, K. Y.; Liu, Ke; Liu, L.; Liu, M. H.; Liu, P. L.; Liu, Q.; Liu, Q.; Liu, S. B.; Liu, Shuai; Liu, T.; Liu, T.; Liu, W. M.; Liu, X.; Liu, Y.; Liu, Y. B.; Liu, Z. A.; Liu, Z. Q.; Lou, X. C.; Lu, F. X.; Lu, H. J.; Lu, J. D.; Lu, J. G.; Lu, X. L.; Lu, Y.; Lu, Y. P.; Luo, C. L.; Luo, M. X.; Luo, P. W.; Luo, T.; Luo, X. L.; Lyu, X. R.; Ma, F. C.; Ma, H. L.; Ma, L. L.; Ma, M. M.; Ma, Q. M.; Ma, R. Q.; Ma, R. T.; Ma, X. X.; Ma, X. Y.; Maas, F. E.; Maggiora, M.; Maldaner, S.; Malde, S.; Malik, Q. A.; Mangoni, A.; Mao, Y. J.; Mao, Z. P.; Marcello, S.; Meng, Z. X.; Messchendorp, J. G.; Mezzadri, G.; Min, T. J.; Mitchell, R. E.; Mo, X. H.; Muchnoi, N. Yu.; Muramatsu, H.; Nakhoul, S.; Nefedov, Y.; Nerling, F.; Nikolaev, I. B.; Ning, Z.; Nisar, S.; Olsen, S. L.; Ouyang, Q.; Pacetti, S.; Pan, X.; Pan, Y.; Pathak, A.; Pathak, A.; Patteri, P.; Pelizaeus, M.; Peng, H. P.; Peters, K.; Pettersson, J.; Ping, J. L.; Ping, R. G.; Pogodin, S.; Poling, R.; Prasad, V.; Qi, H.; Qi, H. R.; Qi, K. H.; Qi, M.; Qi, T. Y.; Qian, S.; Qian, W. B.; Qian, Z.; Qiao, C. F.; Qin, L. Q.; Qin, X. P.; Qin, X. S.; Qin, Z. H.; Qiu, J. F.; Qu, S. Q.; Rashid, K. H.; Ravindran, K.; Redmer, C. F.; Rivetti, A.; Rodin, V.; Rolo, M.; Rong, G.; Rosner, Ch.; Rump, M.; Sang, H. S.; Sarantsev, A.; Schelhaas, Y.; Schnier, C.; Schoenning, K.; Scodeggio, M.; Shan, D. C.; Shan, W.; Shan, X. Y.; Shangguan, J. F.; Shao, M.; Shen, C. P.; Shen, H. F.; 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doi:10.1103/PhysRevD.105.L071101
Search for invisible decays of the $Λ$ baryon

M. Ablikim (Institute of High Energy Physics, Beijing 100049, People’s Republic of China) ; M. N. Achasov (G.I. Budker Institute of Nuclear Physics SB RAS (BINP), Novosibirsk 630090, Russia) ; P. Adlarson (Uppsala University, Box 516, SE-75120 Uppsala, Sweden) ; S. Ahmed (Helmholtz Institute Mainz, Staudinger Weg 18, D-55099 Mainz, Germany) ; M. Albrecht (Bochum Ruhr-University, D-44780 Bochum, Germany) ; et al. - Show all 515 authors
A search for invisible decays of the $Λ$ baryon is carried out in the process $J / ψ \to Λ \bar{Λ}$ based on $(1.0087 \pm 0.0044) \times 10^{10} J / ψ$ events collected with the BESIII detector located at the BEPCII storage ring. No signals are found for the invisible decays of $Λ$ baryon, and the upper limit of the branching fraction is determined to be $7.4 \times 10^{- 5}$ at the 90% confidence level. This is the first search for invisible decays of baryons; such searches will play an important role in constraining dark sector models related to the baryon asymmetry.
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      "surname": "Zhu", 
      "given_names": "Z.\u2009A.", 
      "full_name": "Zhu, Z.\u2009A."
    }, 
    {
      "raw_name": "B.\u2009S. Zou", 
      "affiliations": [
        {
          "country": "China", 
          "value": "Institute of High Energy Physics, Beijing 100049, People\u2019s Republic of China"
        }
      ], 
      "surname": "Zou", 
      "given_names": "B.\u2009S.", 
      "full_name": "Zou, B.\u2009S."
    }, 
    {
      "raw_name": "J.\u2009H. Zou", 
      "affiliations": [
        {
          "country": "China", 
          "value": "Institute of High Energy Physics, Beijing 100049, People\u2019s Republic of China"
        }
      ], 
      "surname": "Zou", 
      "given_names": "J.\u2009H.", 
      "full_name": "Zou, J.\u2009H."
    }
  ], 
  "titles": [
    {
      "source": "APS", 
      "title": "Search for invisible decays of the <math><mi>\u039b</mi></math> baryon"
    }
  ], 
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    {
      "value": "10.1103/PhysRevD.105.L071101"
    }
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  "publication_info": [
    {
      "journal_volume": "105", 
      "journal_title": "Physical Review D", 
      "material": "other", 
      "journal_issue": "7", 
      "year": 2022
    }
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    "submission_number": "6bd14ca2d74a11eca1a1661ec451a4e4"
  }, 
  "page_nr": [
    8
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  "license": [
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      "url": "https://creativecommons.org/licenses/by/4.0/", 
      "license": "CC-BY-4.0"
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    {
      "statement": "Published by the American Physical Society", 
      "year": "2022"
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  "control_number": "69273", 
  "collaborations": [
    {
      "value": "BESIII Collaboration"
    }
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      "categories": [
        "hep-ex"
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      "value": "2110.06759"
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  "abstracts": [
    {
      "source": "APS", 
      "value": "A search for invisible decays of the <math><mi>\u039b</mi></math> baryon is carried out in the process <math><mi>J</mi><mo>/</mo><mi>\u03c8</mi><mo>\u2192</mo><mi>\u039b</mi><mover><mi>\u039b</mi><mo>\u00af</mo></mover></math> based on <math><mo>(</mo><mn>1.0087</mn><mo>\u00b1</mo><mn>0.0044</mn><mo>)</mo><mo>\u00d7</mo><msup><mn>10</mn><mn>10</mn></msup><mtext> </mtext><mtext> </mtext><mi>J</mi><mo>/</mo><mi>\u03c8</mi></math> events collected with the BESIII detector located at the BEPCII storage ring. No signals are found for the invisible decays of <math><mi>\u039b</mi></math> baryon, and the upper limit of the branching fraction is determined to be <math><mn>7.4</mn><mo>\u00d7</mo><msup><mn>10</mn><mrow><mo>\u2212</mo><mn>5</mn></mrow></msup></math> at the 90% confidence level. This is the first search for invisible decays of baryons; such searches will play an important role in constraining dark sector models related to the baryon asymmetry."
    }
  ], 
  "imprints": [
    {
      "date": "2022-04-19", 
      "publisher": "APS"
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}
Published on:: 19 April 2022
Publisher:: APS
Published in:: Physical Review D , Volume 105 (2022)
Issue 7
DOI:: https://doi.org/10.1103/PhysRevD.105.L071101
arXiv:: 2110.06759
Copyrights:: Published by the American Physical Society
Licence:: CC-BY-4.0
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