X(3872) in lattice QCD with exact chiral symmetry

作者：Chiu Ting Wai^*; Hsieh Tung Han

来源：Physics Letters B, 2007, 646(2-3): 95-99.

DOI：10.1016/j.physleth.2007.01.019

• lattice QCD
• exact chiral symmetry
• exotic mesons
• charmed mesons
• diquarks

We investigate the mass spectrum of 1(++) exotic mesons with quark content (cq (c) over bar(q) over bar), using molecular and diquark-antidiquark operators, in quenched lattice QCD with exact chiral symmetry. For the molecular operator {((q) over bar gamma(i)c)((c) over bar gamma(5)q) - ((c) over bar gamma(i)q)((q) over bar gamma 5c)} and the diquark-antidiquark operator {(q(T)C gamma(i)c)((q) over barC gamma(5)(c) over bar (T)) - ((q) over bar C-T gamma(TT)(i))(q(T)C gamma(5)c)), both detect a resonance with mass around 3890 +/- 130 MeV in the limit m(q) -> m(u), which is naturally identified with X(3872). Further, heavier exotic meson resonances with J(PC) = 1(++) are also detected, with quark content (cws) around 4100 +/- 50 MeV.

• 出版日期2007-3-8