Amplitude analysis of B+→ ψ(2S)K+π+π− decays

• Published in: The journal of high energy physics 2025-01, Vol.2025 (1), p.54-69, Article 54
• Main Authors: Alessio, F., Amhis, Y., Andersson, M., Bao, H., Bedeschi, F., Bernet Andres, S., Bizzeti, A., Bohare, A., Cai, H., Calabrese, R., Calderon Ramirez, S., Carbone, A., Cardinale, R., Casais Vidal, A., Chatzianagnostou, E., Cliff, H. V., Cogneras, E., Collins, P., Contu, A., Corti, G., De Freitas Carneiro Da Graca, U., Decamp, D., Docheva, A. D., Duras, M. M., Easo, S., Egorychev, V., Ene, A., Ferro-Luzzi, M., Frank, M., Franzoso, E., Galati, G., Gambetta, S., Gao, H., Gao, Y., Giemza, H. K., Göbel, C., Graugés, E., Grazette, L., Guittiere, M., Han, X., Hansmann-Menzemer, S., Hu, J., Ishteev, A., Johnson, D., Jones, C. R., Jost, B., Juszczak, I., Kang, Y., Ketel, T., Krupa, W., Kubat, J., Lemos Cid, E., Leroy, O., Libralon, S., Litvinov, R., Liu, K., Ma, R., Madurai, M. J., Marks, J., Martinazzoli, L., Matev, R., Mauri, A., Mcconnell, L., McGrath, T. H., Miao, D., Nicolini, J., Okhotnikov, A., Otalora Goicochea, J. M., Pajero, T., Papanestis, A., Pappalardo, L. L., Pappenheimer, C., Patel, M., Petrolini, A., Poslavskii, S., Punzi, G., Rama, M., Ramírez García, M., Roensch, J., Rudolph, M. S., Scarabotto, A., Schneider, O., Smallwood, J. C., Soares Lavra, L., Souza De Paula, B., Terentev, A., Ursov, E., Uwer, U., Van Hecke, H., Vilasis-Cardona, X., Wang, J., Wang, Z., Wiedner, D., Yang, D., Yang, K., Yang, S., Zeng, C., Zhao, Y., Zheng, S. Z., Zhou, T.
• Format: Article
• Language: English
• Subjects: Amplitudes; B Physics; Charged particles; Charm (particle physics); Classical and Quantum Gravitation; Collaboration; Elementary Particles; Exotics; Hadron-Hadron Scattering; Hadrons; Luminosity; Physics; Physics and Astronomy; Protons; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Quarks; Regular Article - Experimental Physics; Relativity Theory; Sensors; Simulation; Software; Spectroscopy; Spectrum analysis; String Theory
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP01(2025)054

A bstract The first full amplitude analysis of B + → ψ (2 S ) K + π + π − decays is performed using proton-proton collision data corresponding to an integrated luminosity of 9 fb −1 recorded with the LHCb detector. The rich K + π + π − spectrum is studied and the branching fractions of the resonant substructure associated with the prominent K 1 (1270) + contribution are measured. The data cannot be described by conventional strange and charmonium resonances only. An amplitude model with 53 components is developed comprising 11 hidden-charm exotic hadrons. New production mechanisms for charged charmonium-like states are observed. Significant resonant activity with spin-parity J P = 1 + in the ψ (2 S ) π + system is confirmed and a multi-pole structure is demonstrated. The spectral decomposition of the ψ (2 S ) π + π − invariant-mass structure, dominated by X 0 → ψ (2 S ) ρ (770) 0 decays, broadly resembles the J / ψϕ spectrum observed in B + → J / ψϕK + decays. Exotic ψ (2 S ) K + π − resonances are observed for the first time.