Model-independent observation of exotic contributions to $B^0\to J/\psi K^{+}{\pi }^{-}$ decays

Abstract

An angular analysis of $B^0\to J/\psi K^{+}{\pi }^{-}$ decays is performed, using proton-proton collision data corresponding to an integrated luminosity of 3~${\mathrm{fb}}^{-1}$ collected with the LHCb detector. The $m(K^{+}{\pi }^{-})$ spectrum is divided into fine bins. In each $m(K^{+}{\pi }^{-})$ bin, the hypothesis that the three-dimensional angular distribution can be described by structures induced only by $K^{\ast }$ resonances is examined, making minimal assumptions about the $K^{+}{\pi }^{-}$ system. The data reject the $K^{\ast }$-only hypothesis with a large significance, implying the observation of exotic contributions in a model-independent fashion. Inspection of the $m(J/\psi {\pi }^{-})$ versus $m(K^{+}{\pi }^{-})$ plane suggests structures near $m(J/\psi {\pi }^{-})=4200$~MeV and 4600~MeV.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at http://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2018-043.html

References in corpus (16)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• sPlot: a statistical tool to unfold data distributions
• Observation of a resonance-like structure in the pi^+- psi' mass distribution in exclusive B-->K pi^+- psi' decays
• Angular analysis of the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay using $3\,\mbox{fb}^{-1}$ of integrated luminosity
• Decay Chain Fitting with a Kalman Filter
• Observation of the resonant character of the $Z(4430{)}^{-}$ state
• Observation of a new charged charmoniumlike state in B -> J/psi K pi decays
• Experimental constraints on the spin and parity of the Z(4430)+
• A New Picture for the Formation and Decay of the Exotic $XYZ$ Mesons
• Search for the Z(4430)^- at BABAR
• Differential branching fraction and angular moments analysis of the decay $B^0\to K^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$ in the $K_{0,2}^{\ast }(1430{)}^0$ region
• Angular analyses of exclusive $\Bbar\to X \ell_1 \ell_2$ with complex helicity amplitudes
• Angular analyses of exclusive $\overline{B}\to X_J{\ell }_1{\ell }_2$ decays for spin $J\le 4$

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• The $XYZ$ states: experimental and theoretical status and perspectives
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• Model-independent study of structure in $B^{+}\to D^{+}{D}^{-}{K}^{+}$ decays
• Heavy hadronic molecules with pion exchange and quark core couplings: a guide for practitioners
• Analysis of the hidden-charm tetraquark mass spectrum with the QCD sum rules
• Dalitz-plot decomposition for three-body decays
• Analysis of the triply-heavy baryon states with the QCD sum rules
• The Spectrum of $P$-Wave Hidden-Charm Exotic Mesons in the Diquark Model
• Correlation of the hidden-charm molecular tetraquarks and the charmoniumlike structures existing in the $B\to XYZ+K$
• Study of $B_s^0\to J/\psi {\pi }^{+}{\pi }^{-}{K}^{+}{K}^{-}$ decays
• Axialvector tetraquark candidates for the $Z_c(3900)$, $Z_c(4020)$, $Z_c(4430)$, $Z_c(4600)$
• Enhanced production of ${\Lambda }_b^0$ baryons in high-multiplicity $pp$ collisions at $\sqrt{s}=13$ TeV
• $Z_c(4430)$ and $Z_c(4200)$ as triangle singularities
• Triangle singularities in ${\bar{B}}^0\to {\chi }_{c1}{K}^{-}{\pi }^{+}$ relevant to $Z_1(4050)$ and $Z_2(4250)$
• Analysis of strong decays of the $Z_c(4600)$ with the QCD sum rules
• Study of charmonium decays to $K_S^{0}K\pi$ in the $B\to (K_S^{0}K\pi )K$ channels
• A complete description of P- and S-wave contributions to the $B^0\to K^{+}{\pi }^{-}{\ell }^{+}{\ell }^{-}$ decay
• Status and Prospects of Exotic Hadrons at Belle II
• Study of the hidden charm $D{\bar{D}}^{\ast }$ interactions in chiral effective field theory
• Magnetic and quadrupole moments of the $Z_c(4020{)}^{+}$, $Z_c(4050{)}^{+}$, and $Z_c(4600{)}^{+}$ states in the diquark-antidiquark picture
• Does vacuum saturation work for the higher dimensional vacuum condensates in the QCD sum rules?
• Beauty meson decays to charmonuim-like states at LHCb
• Summary of Working Group 5: Physics with Heavy Flavours