Probing the nature of the χc1(3872) state using radiative decays

A bstract : The radiative decays χ c1 (3872) → ψ(2S) γ and χ c1 (3872) → J/ψγ are used to probe the nature of the χ c1 (3872) state using proton-proton collision data collected with the LHCb detector, corresponding to an integrated luminosity of 9 fb − 1 . Using the B + → χ c1 (3872)K + decay, the χ c1 (3872) → ψ(2S) γ process is observed for the first time and the ratio of its partial width to that of the χ c1 (3872) → J/ψγ decay is measured to be $$ \frac{\Gamma_{\chi_{c1}(3872)\to \uppsi \left(2\textrm{S}\right)\gamma }}{\Gamma_{\chi_{c1}(3872)\to \textrm{J}/\uppsi \gamma }}=1.67\pm 0.21\pm 0.12\pm 0.04, $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfrac> <mml:msub> <mml:mi>Γ</mml:mi> <mml:mrow> <mml:msub> <mml:mi>χ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> <mml:mn>1</mml:mn> </mml:mrow> </mml:msub> <mml:mfenced> <mml:mn>3872</mml:mn> </mml:mfenced> <mml:mo>→</mml:mo> <mml:mi>ψ</mml:mi> <mml:mfenced> <mml:mrow> <mml:mn>2</mml:mn> <mml:mi>S</mml:mi> </mml:mrow> </mml:mfenced> <mml:mi>γ</mml:mi> </mml:mrow> </mml:msub> <mml:msub> <mml:mi>Γ</mml:mi> <mml:mrow> <mml:msub> <mml:mi>χ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> <mml:mn>1</mml:mn> </mml:mrow> </mml:msub> <mml:mfenced> <mml:mn>3872</mml:mn> </mml:mfenced> <mml:mo>→</mml:mo> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mi>γ</mml:mi> </mml:mrow> </mml:msub> </mml:mfrac> <mml:mo>=</mml:mo> <mml:mn>1.67</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.21</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.12</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.04</mml:mn> <mml:mo>,</mml:mo> </mml:math> where the first uncertainty is statistical, the second systematic and the third is due to the uncertainties on the branching fractions of the ψ(2S) and J/ψ mesons. The measured ratio makes the interpretation of the χ c1 (3872) state as a pure D 0 $$ {\overline{\textrm{D}}}^{\ast 0} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mover> <mml:mi>D</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mrow> <mml:mo>∗</mml:mo> <mml:mn>0</mml:mn> </mml:mrow> </mml:msup> </mml:math> + $$ {\overline{\textrm{D}}}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mover> <mml:mi>D</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mn>0</mml:mn> </mml:msup> </mml:math> D *0 molecule questionable and strongly indicates a sizeable compact charmonium or tetraquark component within the χ c1 (3872) state.

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Journal
Journal of High Energy Physics
Published
2024-11-21
DOI
https://doi.org/10.1007/jhep11(2024)121
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9
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Particle physics theoretical and experimental studies
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article
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5.94

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article

Probing the nature of the χc1(3872) state using radiative decays

L. De Paula, A. Seuthe, I. Corredoira, D. Martínez Santos et al.
9 citations
Journal of High Energy Physics
Particle physics theoretical and experimental studies
5.94
article

Probing the nature of the χc1(3872) state using radiative decays

L. De Paula, A. Seuthe, I. Corredoira, D. Martínez Santos, W. Liu, M. Martinelli, J. de Boer, S. Yang, H.-P. Dembinski, O. Leroy, S. Jakobsen, A. Kupść, W. Barter, S. Scherl, I. Juszczak, A. Bertolin, K. Richardson, G. Punzi, B. Khanji, G. Sarpis, H. Lee, M. Guarise, P. Ilten, X. Liang, G. Tonani, Ö. Özçelik, Vukan Jevtic, M. Hufnagel Maranha De Faria, D. Marangotto, V. Matiunin, J. E. Blank, M. Andreotti, D. Bacher, R. Aaij, A. Grecu, C. Prouvé, W. Baldini, A. Inglessi, H. Schindler, A. Okhotnikov, B. K. Jashal, A. Ishteev, J. Novoa Fernandez, M. Pló Casasús, R. Matev, P. Garcia Moreno, G. Mancinelli, F. Blanc, D. S. Mitzel, R. Shorkin, S. Neubert, F. Ferreira Rodrigues, G. Liu, R. Quagliani, H. Sazak, C. Chen, J. Baptista de Souza Leite, A. Konoplyannikov, A. Ryzhikov, L. Toscano, A. Mauri, Irene Bachiller Perea, B. Couturier, B. Dey, S. J. Jaimes Elles, D. Nicotra, V. Dobishuk, Z. Chen, P. Baladrón Rodríguez, A. D. Dowling, M. Zdybał, E. Zaffaroni, T. P. Jones, Q. Li, N. 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Abstract

A bstract : The radiative decays χ c1 (3872) → ψ(2S) γ and χ c1 (3872) → J/ψγ are used to probe the nature of the χ c1 (3872) state using proton-proton collision data collected with the LHCb detector, corresponding to an integrated luminosity of 9 fb − 1 . Using the B + → χ c1 (3872)K + decay, the χ c1 (3872) → ψ(2S) γ process is observed for the first time and the ratio of its partial width to that of the χ c1 (3872) → J/ψγ decay is measured to be $$ \frac{\Gamma_{\chi_{c1}(3872)\to \uppsi \left(2\textrm{S}\right)\gamma }}{\Gamma_{\chi_{c1}(3872)\to \textrm{J}/\uppsi \gamma }}=1.67\pm 0.21\pm 0.12\pm 0.04, $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfrac> <mml:msub> <mml:mi>Γ</mml:mi> <mml:mrow> <mml:msub> <mml:mi>χ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> <mml:mn>1</mml:mn> </mml:mrow> </mml:msub> <mml:mfenced> <mml:mn>3872</mml:mn> </mml:mfenced> <mml:mo>→</mml:mo> <mml:mi>ψ</mml:mi> <mml:mfenced> <mml:mrow> <mml:mn>2</mml:mn> <mml:mi>S</mml:mi> </mml:mrow> </mml:mfenced> <mml:mi>γ</mml:mi> </mml:mrow> </mml:msub> <mml:msub> <mml:mi>Γ</mml:mi> <mml:mrow> <mml:msub> <mml:mi>χ</mml:mi> <mml:mrow> <mml:mi>c</mml:mi> <mml:mn>1</mml:mn> </mml:mrow> </mml:msub> <mml:mfenced> <mml:mn>3872</mml:mn> </mml:mfenced> <mml:mo>→</mml:mo> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:mi>γ</mml:mi> </mml:mrow> </mml:msub> </mml:mfrac> <mml:mo>=</mml:mo> <mml:mn>1.67</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.21</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.12</mml:mn> <mml:mo>±</mml:mo> <mml:mn>0.04</mml:mn> <mml:mo>,</mml:mo> </mml:math> where the first uncertainty is statistical, the second systematic and the third is due to the uncertainties on the branching fractions of the ψ(2S) and J/ψ mesons. The measured ratio makes the interpretation of the χ c1 (3872) state as a pure D 0 $$ {\overline{\textrm{D}}}^{\ast 0} $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mover> <mml:mi>D</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mrow> <mml:mo>∗</mml:mo> <mml:mn>0</mml:mn> </mml:mrow> </mml:msup> </mml:math> + $$ {\overline{\textrm{D}}}^0 $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msup> <mml:mover> <mml:mi>D</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> <mml:mn>0</mml:mn> </mml:msup> </mml:math> D *0 molecule questionable and strongly indicates a sizeable compact charmonium or tetraquark component within the χ c1 (3872) state.

Journal of High Energy PhysicsVol. 2024(11)
University College Dublin (IE), University of Siena (IT), Eötvös Loránd University (HU), University of Pisa (IT), Universidade da Coruña (ES), University of Bergamo (IT), University of Rome Tor Vergata (IT), Universidade Federal do Rio de Janeiro (BR), Uppsala University (SE), Jagiellonian University (PL), Rutherford Appleton Laboratory (GB), Centre National de la Recherche Scientifique (FR), Los Alamos National Laboratory (US), University of Bonn (DE), University of Padua (IT), École Polytechnique (FR), University of Liverpool (GB), Universidade de Brasília (BR), Scuola Normale Superiore (IT), Federal Center for Technological Education Celso Suckow da Fonseca (BR), Universitat de València (ES), Hunan University (CN), National Autonomous University of Honduras (HN), Délégation Paris 7 (FR), University of Groningen (NL), University of Cagliari (IT), Henan University (CN), South China Normal University (CN), University of Milan (IT), Universidad de Alcalá (ES), University of Urbino (IT), Université Clermont Auvergne (FR), Universidade de Santiago de Compostela (ES), TU Dortmund University (DE), University of Ferrara (IT), Peking University (CN), University of Zurich (CH), University of Basilicata (IT), Université Paris Cité (FR), Aix-Marseille Université (FR), Heidelberg University (DE), University of Cambridge (GB), Cracow University of Technology (PL), Pontifícia Universidade Católica do Rio de Janeiro (BR), University of Perugia (IT), Université Paris-Saclay (FR), University of Michigan (US), Kharkiv Institute of Physics and Technology (UA), University of Manchester (GB), Maastricht University (NL), University of Bristol (GB), Universidad Nacional de Colombia (CO), Wuhan University (CN), University of Warwick (GB), Sorbonne Université (FR), University of Oxford (GB), Central China Normal University (CN), Sorbonne Paris Cité (FR), Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering (RO), National Institute for Subatomic Physics (NL), National Centre for Nuclear Research (PL), Instituto de Física Corpuscular (ES), Laboratoire de Physique de Clermont Auvergne (FR), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Padova (IT), Institute of Nuclear Physics, Polish Academy of Sciences (PL), Istituto Nazionale di Fisica Nucleare, Sezione di Ferrara (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Bari (IT), Istituto Nazionale di Fisica Nucleare, Roma Tor Vergata (IT), FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ), Centro Brasileiro de Pesquisas Físicas (BR), Istituto Nazionale di Fisica Nucleare, Sezione di Genova (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Cagliari (IT), Los Alamos National Security (United States) (US), Istituto Nazionale di Fisica Nucleare, Sezione di Firenze (IT), Institut National de Physique Nucléaire et de Physique des Particules (FR), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Milano (IT), Institute of High Energy Physics (CN), Institute for Advanced Study (DE), Istituto Nazionale di Fisica Nucleare, Sezione di Milano Bicocca (IT), Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Frascati (IT), Institute for Nuclear Research (UA), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT), Laboratoire Leprince-Ringuet (FR), Max Planck Institute for Nuclear Physics (DE), Istituto Nazionale di Fisica Nucleare, Sezione di Roma I (IT), LIP6 (FR), Istituto Nazionale di Fisica Nucleare, Sezione di Pisa (IT), Istituto Nazionale di Fisica Nucleare, Sezione di Perugia (IT), University of Chinese Academy of Sciences (CN), Consejo Nacional de Rectores, State Key Laboratory of Nuclear Physics and Technology, University of Florence (IT), Imperial College London (GB), UK Astronomy Technology Centre (GB), École Polytechnique Fédérale de Lausanne (CH), University of Bari Aldo Moro (IT), Universitat Ramon Llull (ES), Monash University (AU), University of Cincinnati (US), Massachusetts Institute of Technology (US), University of Milano-Bicocca (IT), University of Maryland, College Park (US), European Organization for Nuclear Research (CH), AGH University of Krakow (PL), Université Savoie Mont Blanc (FR), Syracuse University (US), Universitat de Barcelona (ES), Lanzhou University (CN), University of Glasgow (GB), University of Birmingham (GB), University of Genoa (IT), RWTH Aachen University (DE), Ruhr University Bochum (DE), University of Bologna (IT), University of Edinburgh (GB), Tsinghua University (CN)
National Science Foundation, U.S. Department of Energy, Alexander von Humboldt-Stiftung, CERN, De La Salle University, UK Research and Innovation, Ministerul Cercetării, Inovării şi Digitalizării, Institutul National de Cercetare-Dezvoltare pentru Fizica si Inginerie Nucleara 'Horia Hulubei', Institut Polytechnique de Paris, Leverhulme Trust, European Commission, University College Dublin, Deutsche Forschungsgemeinschaft, Universität Heidelberg, Agence Nationale de la Recherche, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, National Natural Science Foundation of China, Vrije Universiteit Amsterdam, Coordenação de Aperfeiçoamento de Pessoal de Nível Superior, Bundesministerium für Bildung und Forschung, Nederlandse Organisatie voor Wetenschappelijk Onderzoek, Generalitat Valenciana, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Max-Planck-Gesellschaft, Ministerstwo Edukacji i Nauki, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, National Academy of Sciences of Ukraine, Centre National de la Recherche Scientifique, Financiadora de Estudos e Projetos, Ministerio de Ciencia e Innovación, Université Paris Diderot, Universitat de Barcelona, RWTH Aachen University, Université Paris-Saclay, Rheinische Friedrich-Wilhelms-Universität Bonn, Universitat Ramon Llull, Région Auvergne-Rhône-Alpes, Universidade de Santiago de Compostela, CAS Center for Excellence in Particle Physics, Technische Universität Dortmund, Max Planck Institute for Nuclear Physics, Sorbonne Université, Australian Research Data Commons, Science and Technology Facilities Council, Deutsches Elektronen-Synchrotron, Fundamental Research Funds for the Central Universities, Institut National de Physique Nucléaire et de Physique des Particules, Institut de Ciències del Cosmos, Nuclear Physics, H2020 Marie Skłodowska-Curie Actions
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