Study of the Zc+ channel using lattice QCD

Sasa Prelovsek, C. B. Lang, Luka Leskovec, and Daniel Mohler
Phys. Rev. D 91, 014504 – Published 15 January 2015

Abstract

Recently experimentalists have discovered several charged charmoniumlike hadrons Zc+ with unconventional quark content c¯cd¯u. We perform a search for Zc+ with mass below 4.2 GeV in the channel IG(JPC)=1+(1+) using lattice QCD. The major challenge is presented by the two-meson states J/ψπ, ψ2Sπ, ψ1Dπ, DD¯*, D*D¯*, ηcρ that are inevitably present in this channel. The spectrum of eigenstates is extracted using a number of meson-meson and diquark-antidiquark interpolating fields. For our pion mass of 266 MeV we find all the expected two-meson states but no additional candidate for Zc+ below 4.2 GeV. Possible reasons for not seeing an additional eigenstate related to Zc+ are discussed. We also illustrate how a simulation incorporating interpolators with a structure resembling low-lying two-meson states seems to render a Zc+ candidate, which is however not robust after further two-meson states around 4.2 GeV are implemented.

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  • Received 12 June 2014

DOI:https://doi.org/10.1103/PhysRevD.91.014504

© 2015 American Physical Society

Authors & Affiliations

Sasa Prelovsek1,2,*, C. B. Lang3,†, Luka Leskovec2,‡, and Daniel Mohler4,§

  • 1Department of Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia
  • 2Jozef Stefan Institute, Jamova 39, 1000 Ljubljana, Slovenia
  • 3Institute of Physics, University of Graz, A-8010 Graz, Austria
  • 4Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, Illinois 60510-5011, USA

  • *sasa.prelovsek@ijs.si
  • christian.lang@uni-graz.at
  • luka.leskovec@ijs.si
  • §dmohler@fnal.gov

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Vol. 91, Iss. 1 — 1 January 2015

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