Study of \(D_{s1}(2460)^{+}\to D_{s}^{+}\pi^{+}\pi^{-}\) in \(B\to {\bar{D}}^{()}D_{s}^{+}\pi^{+}\pi^{-}\) decays

• Published in: arXiv.org
• Main Authors: collaboration, LHCb, Albrecht, J, L An, Anderlini, L, Bachmann, S, J Baptista de Souza Leite, Belyaev, I, Blake, T, O Boente Garcia, Bolzonella, R, Bouchiba, S A, Caillet, A C, Caravaca-Mora, R, Caspary, R, Cholak, S, Colonna, M C, Congedo, L, E Curras Rivera, Currie, R, Dai, X, U De Freitas Carneiro Da Graca, De Paula, L, Delaney, B, Didenko, S, Dobishuk, V, Egorychev, A, Evans, T, M Fernandez Gomez, Foulds-Holt, D, Führing, Q, Gershon, T, Giemza, H K, C Gu, Guliaeva, V, Hadjivasiliou, C, Hennessy, K, Howarth, N, Jage, H, Jans, E, J Juan Castella, Juszczak, I, Karacson, M, Karpenkov, D, Ketel, T, Kmiec, M R, Koppenburg, P, Kotriakhova, S, K Li, Lindner, R, Mackey, L M, Maltsev, T, Manca, G, Martelli, G, Mayencourt, P, Mazurek, M, Minucci, E, Mombächer, T, Morris, A B, Oyanguren, A, Paciolla, F, Padeken, K O, Panshin, G, Patoc, J, Pereima, D, Pfaller, J P, Piccolo, L, Polci, F, Qian, W, Rodrigues, E, Salomoni, M, Santovetti, E, Sarpis, G, Shang, Y, Shears, T, Shevchenko, V, Shi, B, Soler, F J P, Sriskaran, V, Tobin, M, Valenti, G, Vesterinen, M, Voropaev, N, Wagner, J, Walsh, J, Wang, X, Wang, Y, Watson, N K, Williams, Z, L Xu, Z Xu, Yang, S, Yeroshenko, V, Yin, H, Yu, C Y, Zhang, S, Zhao, Y, Zhelezov, A, Zheng, S Z, Zheng, X Z, Zhovkovska, V
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 05.11.2024
• Subjects: Luminosity; Protons
• ISSN: 2331-8422

An amplitude analysis of the \(D_{s1}(2460)^+\to D_{s}^{+}\pi^{+}\pi^{-}\) transition is performed simultaneously in \(B^{0}\to D^{-}D_{s}^{+}\pi^{+}\pi^{-}\), \(B^{+}\to{\bar{D}}^{0} D_{s}^{+}\pi^{+}\pi^{-}\), and \(B^{0}\to D^{*-}D_{s}^{+}\pi^{+}\pi^{-}\) decays. The study is based on a data sample of proton-proton collisions recorded with the LHCb detector at centre-of-mass energies of \(\sqrt{s}=7,8,\) and \(13\,\)TeV, corresponding to a total integrated luminosity of \(9\,\rm{fb}^{-1}\). A clear double-peak structure is observed in the \(m(\pi^{+}\pi^{-})\) spectrum of the \(D_{s1}(2460)^{+}\to D_{s}^{+}\pi^{+}\pi^{-}\) decay. The data can be described either with a model including \(f_0(500)\), \(f_0(980)\) and \(f_2(1270)\) resonances, in which the contributions of \(f_0(980)\) and \(f_2(1270)\) are unexpectedly large, or with a model including \(f_0(500)\), a doubly charged open-charm tetraquark state \(T_{c\bar{s}}^{++}\) and its isospin partner \(T_{c\bar{s}}^{0}\). If the former is considered implausible, the \(T_{c\bar{s}}\) states are observed with high significance, and the data are consistent with isospin symmetry. When imposing isospin constraints between the two \(T_{c\bar{s}}\) states, their mass and width are determined to be \(2327\pm13\pm13\,\)MeV and \(96\pm16\,^{+170}_{-23}\,\)MeV, respectively, where the first uncertainty is statistical and the second is systematic. The mass is slightly below the \(DK\) threshold, and a spin-parity of \(0^+\) is favoured with high significance.