Amplitude analysis of $B^{+}\to \psi (2S)K^{+}{\pi }^{+}{\pi }^{-}$ decays

Abstract

The first full amplitude analysis of $B^{+}\to \psi (2S)K^{+}{\pi }^{+}{\pi }^{-}$ decays is performed using proton-proton collision data corresponding to an integrated luminosity of $9{\text{fb}}^{-1}$ recorded with the LHCb detector. The rich $K^{+}{\pi }^{+}{\pi }^{-}$ 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 $\psi (2S){\pi }^{+}$ system is confirmed and a multi-pole structure is demonstrated. The spectral decomposition of the $\psi (2S){\pi }^{+}{\pi }^{-}$ invariant-mass structure, dominated by $X^0\to \psi (2S)\rho (770{)}^0$ decays, broadly resembles the $J/\psi \varphi$ spectrum observed in $B^{+}\to J/\psi \varphi K^{+}$ decays. Exotic $\psi (2S)K^{+}{\pi }^{-}$ resonances are observed for the first time.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/1601 (LHCb public pages)

References in corpus (30)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• A weakly informative default prior distribution for logistic and other regression models
• LHCb Detector Performance
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• sPlot: a statistical tool to unfold data distributions
• Diquark-Antidiquarks with Hidden or Open Charm and the Nature of X(3872)
• Isospin breaking of the narrow charmonium state of Belle at 3872 MeV as a deuson
• Decay Chain Fitting with a Kalman Filter
• The pion-pion scattering amplitude. IV: Improved analysis with once subtracted Roy-like equations up to 1100 MeV
• Efficient, reliable and fast high-level triggering using a bonsai boosted decision tree
• Performance of the LHCb Outer Tracker
• Charmonium Options for the X(3872)
• Branching fractions, polarisation and asymmetries of B -> VV decays
• Measurement of the track reconstruction efficiency at LHCb
• Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2
• Improved performance of the LHCb Outer Tracker in LHC Run 2
• K-matrix analysis of the (IJ^{PC}=00^{++})-wave in the mass region below 1900 MeV
• Is X(3872) a possible candidate of hybrid meson
• Reweighting with Boosted Decision Trees
• A model-independent analysis of final-state interactions in \bar B_{d/s}^0 --> J/psi pi pi
• A new parametrization for the scalar pion form factors
• Amplitude Analyses of $D^0\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ and $D^0\to K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}$ Decays
• Covariant Helicity-Coupling Amplitudes: A New Formulation
• Model-independent determination of the strong phase difference between $D^0$ and ${\bar{D}}^0\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$ amplitudes
• Exotic Hadrons at LHCb
• Model selection for amplitude analysis
• Coherent helicity amplitude for sequential decays
• Using an amplitude analysis to measure the photon polarisation in $B\to K\pi \pi \gamma$ decays

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