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SUMMARY:OPE and quark-hadron duality for correlators of tetraquark current
 s in the 1/Nc expansion
DTSTART:20210429T140000
DTEND:20210429T153000
DTSTAMP:20260430T175459Z
UID:a254f97b5639a2f0607bfa7e2848eb062ac90f01741167e3b2823b09
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dmitri Melikhov (Moscow State U. and Vienna U.)\nWe discuss th
 e operator product expansion (OPE) and quark-hadron duality for two-point 
 Green functions of tetraquark currents. We emphasize that the factorizable
  part of the OPE series for such Green functions is saturated by the full 
 system of ordinary hadrons and therefore cannot have any relationship to t
 he tetraquark bound states. Possible tetraquark bound states may be contai
 ned in nonfactorizable parts of these Green functions\; in the framework o
 f 1/Nc-expansion\, nonfactorizable parts provide Nc-suppressed contribut
 ions compared to the Nc-leading factorizable parts. A possible exotic tet
 raquark state may appear only in Nc-subleading contributions to the QCD G
 reen functions. This property provides constraints on the possible narrow 
 tetraquark states at large-Nc.\n\nRecording available at: https://mediasp
 ace.epfl.ch/channel/High+Energy+Theory+Seminars/32518
LOCATION:https://epfl.zoom.us/j/88649572564
STATUS:CONFIRMED
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