QCD sum rule calculation proposes the J/ψ J/ψ tensor molecule as a candidate for X(6200) with mass 6290 MeV and width 149 MeV.
Observation of a family of all-charm tetraquarks
7 Pith papers cite this work. Polarity classification is still indexing.
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The paper predicts a scalar cc-ccbar tetraquark state (X(6400)) and identifies it as the partner to the recently observed tensor state X(6600).
QCD sum rule evaluation of a tensor all-charm tetraquark yields mass 6609±50 MeV and width 165±23 MeV, supporting its role as a key component of the observed X(6600) resonance.
NRQCD calculation finds ~1 MeV widths for T4c to gamma J/psi, tens of eV for T4b, and preferential c cbar annihilation in mixed bc states.
Computes two-photon couplings of scalar and tensor fully-charmed tetraquarks via NRQCD from recent four-body wave functions and finds resonant terms dominate J/ψJ/ψ but not diphoton production in UPCs, disagreeing with naive vector dominance.
A review summarizing recent flavour physics results from ATLAS and CMS using Run 2 and partial Run 3 LHC data.