Observation of sizeable \(\omega\) contribution to \(\chi_{c1}(3872)\to\pi^+\pi^-J/\psi\) decays

• Published in: arXiv.org
• Main Authors: collaboration, LHCb, Abdelmotteleb, A S W, Agapopoulou, C, Aidala, C A, Andreianov, A, Bay, A, Bediaga, I B, Belous, K, Belyaev, I, Bernet, R, Bertolin, A, Boelhauve, J A, Borisyak, M, Butter, J S, Calladine, R, Capriotti, L, Carli, I, Carus, L, Cattaneo, M, Chadwick, A J, Charles, M, Coco, V, Contu, A, Couturier, B, Dai, L, Dalseno, J, D'Ambrosio, C, Dettori, F, Durham, J M, Easo, S, Ely, S, Escher, S, Fischer, K M, Gan, Y, Gaspar, C, Giovannetti, M, Gligorov, V V, Göbel, C, Gomes, A, S Gomez Fernandez, Gotti, C, J He, Heijhoff, K, Jakobsen, S, Kirn, T, Klimaszewski, K, Kostiuk, I, Kot, O, Kucewicz, W, Lefèvre, R, Leverington, B, Litvinov, R, Lupton, O, Maciuc, F, Maisuzenko, D, Malczewski, J J, Marangotto, D, Marconi, U, Mattioli, K R, Mauricio, J, Merli, A, Mikhasenko, M, M -N Minard, Mohammed, R A, Moron, J, Oblakowska-Mucha, A, Obraztsov, V, Owen, P, Parker, W, Petric, M, Poliakova, M, Prasanth, K, M Ramos Pernas, Reboud, M, Renaudin, V, Ribatti, R, Ricci, A M, A Romero Vidal, Ruf, T, Sahoo, N, Salomoni, M, Savrina, D, Schmitt, S, Schubiger, M, Shang, Y, Slater, M W, Slazyk, I, Stanislaus, S, Strekalina, D, Sun, J, Ukleja, A, M Vieites Diaz, Wang, R, Weisser, C, White, D J, Wilkinson, M K, Williams, M, A Xu, Zhang, Y, Zou, Q
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 03.08.2023
• Subjects: Decay; Large Hadron Collider; Luminosity; Particle collisions; Protons
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2204.12597

Resonant structures in the dipion mass spectrum from \(\chi_{c1}(3872)\to\pi^+\pi^- J/\psi\) decays, produced via \(B^+\to K^+\chi_{c1}(3872)\) decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 \(fb^{-1}\). A sizeable contribution from the isospin conserving \(\chi_{c1}(3872)\to\omega J/\psi\) decay is established for the first time, \((21.4\pm2.3\pm2.0)\%\), with a significance of more than \(7.1\sigma\). The amplitude of isospin violating decay, \(\chi_{c1}(3872)\to\rho^0 J/\psi\), relative to isospin conserving decay, \(\chi_{c1}(3872)\to\omega J/\psi\), is properly determined, and it is a factor of six larger than expected for a pure charmonium state.