High Energy Physics - Lattice
[Submitted on 11 Mar 2015 (v1), last revised 23 Jul 2015 (this version, v3)]
Title:X(3872) and Y(4140) using diquark-antidiquark operators with lattice QCD
View PDFAbstract:We perform a lattice study of charmonium-like mesons with $J^{PC}=1^{++}$ and three quark contents $\bar cc \bar du$, $\bar cc(\bar uu+\bar dd)$ and $\bar cc \bar ss$, where the later two can mix with $\bar cc$. This simulation with $N_f=2$ and $m_\pi=266$ MeV aims at the possible signatures of four-quark exotic states. We utilize a large basis of $\bar cc$, two-meson and diquark-antidiquark interpolating fields, with diquarks in both anti-triplet and sextet color representations. A lattice candidate for X(3872) with I=0 is observed very close to the experimental state only if both $\bar cc$ and $D\bar D^*$ interpolators are included; the candidate is not found if diquark-antidiquark and $D\bar D^*$ are used in the absence of $\bar cc$. No candidate for neutral or charged X(3872), or any other exotic candidates are found in the I=1 channel. We also do not find signatures of exotic $\bar cc\bar ss$ candidates below 4.3 GeV, such as Y(4140). Possible physics and methodology related reasons for that are discussed. Along the way, we present the diquark-antidiquark operators as linear combinations of the two-meson operators via the Fierz transformations.
Submission history
From: M Padmanath [view email][v1] Wed, 11 Mar 2015 10:26:05 UTC (183 KB)
[v2] Wed, 18 Mar 2015 16:05:11 UTC (184 KB)
[v3] Thu, 23 Jul 2015 02:30:19 UTC (239 KB)
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