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SUMMARY:Color Confinement\, Hadron Dynamics\, and Hadron Spectroscopy from
Light-Front Holography and Superconformal Algebra
DTSTART;VALUE=DATE-TIME:20180803T133000Z
DTEND;VALUE=DATE-TIME:20180803T140000Z
DTSTAMP;VALUE=DATE-TIME:20210612T163800Z
UID:indico-contribution-2996902@indico.cern.ch
DESCRIPTION:Speakers: Stanley J. Brodsky (SLAC National Accelerator Labor
atory\, Stanfird University)\nQCD is not supersymmetrical in the tradition
al sense -- the QCD Lagrangian is based on quark and gluonic fields\, not
squarks nor gluinos. However\, its hadronic eigensolutions conform to a re
presentation of superconformal algebra\, reflecting the underlying conform
al symmetry of chiral QCD and its Pauli matrix representation. The e
igensolutions of superconformal algebra provide a unified Regge spectrosc
opy of meson\, baryon\, and tetraquarks of the same parity and twist as
equal-mass members of the same 4-plet representation with a universal Regg
e slope. The pion $q \\bar q$ eigenstate has zero mass for $m_q=0.$ Th
e superconformal relations also can be extended to heavy-light quark mes
ons and baryons. The combined approach of light-front holography and sup
erconformal algebra also provides insight into the origin of the QCD mass
scale and color confinement. A key observation is the remarkable dAFF pr
inciple which shows how a mass scale can appear in the Hamiltonian and the
equations of motion while retaining the conformal symmetry of the action.
When one applies the dAFF procedure to chiral QCD\, a mass scale $\\kap
pa$ appears which determines universal Regge slopes\, hadron masses in the
absence of the Higgs coupling\, and the mass parameter underlying the Gau
ssian functional form of the nonperturbative QCD running coupling: $\\al
pha_s(Q^2) \\propto \\exp{-{Q^2/4 \\kappa^2}}$\, in agreement with the e
ffective charge determined from measurements of the Bjorken sum rule. Th
e mass scale $\\kappa$ underlying hadron masses can be connected to the
parameter $\\Lambda_{\\overline {MS}}$ in the QCD running coupling by
matching its predicted nonperturbative form to the perturbative QCD regime
. The result is an effective coupling $\\alpha_s(Q^2)$ defined at all mo
menta. One also obtains empirically viable predictions for spacelike a
nd timelike hadronic form factors\, structure functions\, distribution amp
litudes\, and transverse momentum distributions. I will also discuss pr
operties of the QCD and electroweak light-front vacuum.\nhttps://indico.ce
rn.ch/event/648004/contributions/2996902/
LOCATION:Hall E (Arts Bldg.)
RELATED-TO:indico-event-648004@indico.cern.ch
URL:https://indico.cern.ch/event/648004/contributions/2996902/
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