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Title: Study of the $Z_c^+$ channel using lattice QCD

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.
Authors:
 [1] ;  [2] ;  [1] ;  [3]
  1. Stefan Inst., Ljubljana
  2. Graz U.
  3. Fermilab
Publication Date:
OSTI Identifier:
1295681
Report Number(s):
FERMILAB-PUB-14-144-T; arXiv:1405.7623
1298510
DOE Contract Number:
AC02-07CH11359
Resource Type:
Journal Article
Resource Relation:
Journal Name: Phys.Rev.; Journal Volume: D91; Journal Issue: 1
Research Org:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS