Amplitude analysis of B$^{+}$→ ψ(2S)K$^{+}$π$^{+}$π$^{−}$ decays - INSPIRE

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Amplitude analysis of B $^{+}$ → ψ(2S)K $^{+}$ π $^{+}$ π $^{−}$ decays

LHCb

Collaboration

Jul 17, 2024

69 pages

Published in:

JHEP 01 (2025) 054

Published: Jan 8, 2025

e-Print:

2407.12475 [hep-ex]

DOI:

10.1007/JHEP01(2025)054

Report number:

LHCb-PAPER-2024-014,
CERN-EP-2024-177

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (Springer)

The first full amplitude analysis of B

^{+}

→ ψ(2S)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(2S)π

^{+}

system is confirmed and a multi-pole structure is demonstrated. The spectral decomposition of the ψ(2S)π

^{+}

π

^{−}

invariant-mass structure, dominated by X

^{0}

→ ψ(2S)ρ(770)

^{0}

decays, broadly resembles the J/ψϕ spectrum observed in B

^{+}

→ J/ψϕK

^{+}

decays. Exotic ψ(2S)K

^{+}

π

^{−}

resonances are observed for the first time.[graphic not available: see fulltext]

Note:

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2024-014.html (LHCb public pages)

B Physics
Exotics
Hadron-Hadron Scattering
Spectroscopy

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