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Publication . Preprint . Research . Other literature type . Article . 2019

Model-Independent Observation of Exotic Contributions to $B^0\to J/\psi K^+\pi^-$ Decays

LHCb collaboration; Aaij, R.; Beteta, C. Abellán; Adeva, B.; Adinolfi, M.; Aidala, C. A.; Ajaltouni, Z.; +193 Authors
Open Access
English
Published: 17 Jan 2019
Publisher: RWTH Aachen University
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~${\rm fb}^{-1}$ 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.

Comment: All 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

Subjects by Vocabulary

Dewey Decimal Classification: ddc:530

arXiv: High Energy Physics::Experiment

Subjects

530, B0 --> J/psi(3100) K+ pi-, experimental results, CERN LHC Coll, LHC-B, K*(892)0, mass dependence, mass spectrum: (J/psi(3100) pi-), mass spectrum: (K+ pi-), angular distribution, structure, dimension: 3, mass spectrum: (muon+ muon-), muon: pair production, J/psi(3100): leptonic decay, B0: hadronic decay, p p: colliding beams, p p: scattering, Elementary Particles and Fields, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], M231.1, M231:Desig=1, Particle Physics - Experiment, hep-ex, High Energy Physics - Experiment

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