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SUMMARY:Extracting QCD Vacuum Parameters from Exclusive J/ψ Photoproducti
 on at HERA
DTSTART:20260922T150000Z
DTEND:20260922T170000Z
DTSTAMP:20261005T065000Z
UID:indico-event-34393@indico.bnl.gov
CONTACT:ptribedy@bnl.gov
DESCRIPTION:Speakers: Tobias Toll (IIT Delhi)\n\n\nIn the dual superconduc
 tor picture\, the QCD vacuum is a condensate of chromomagnetic monopoles c
 haracterised by two lengths: the penetration depth λ of the chromoelectri
 c field and the coherence length ξ of the condensate. These have previous
 ly been accessible only through lattice calculations of static flux tubes.
  However\, they can instead be measured in exclusive diffraction\, where t
 he transverse profile of a gluonic hotspot is the vacuum’s response to a
  localised colour source and obeys the same Ginzburg–Landau boundary-val
 ue problem. Fitting Clem’s vortex profile to all 104 available H1 and ZE
 US exclusive J/ψ photoproduction points\, spanning |t| < 30 GeV2 and 40 
 ≤ W ≤ 251 GeV\, we obtain χ2/ndf = 0.77 and extract λ = 0.21(2) fm\,
  ξv = 0.109(9) fm\, and a Ginzburg–Landau parameter κ = 2.1(4)\, placi
 ng the QCD vacuum in the type-II regime. The corresponding vector and scal
 ar masses\, 1/λ = 0.94(9) GeV and 1/ξv = 1.81(14) GeV\, agree with latti
 ce determinations of the lightest gluelump and glueball respectively\, and
  the Ginzburg–Landau line tension implied by (λ\, κ) directly reproduc
 es the QCD string tension.\n\n\n\n\n \n\n\n\n\nhttps://indico.bnl.gov/eve
 nt/34393/
URL:https://indico.bnl.gov/event/34393/
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