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SUMMARY:Explaining $^3P_0$ quark-pair creation through Landau-gauge Green'
 s Functions
DTSTART;VALUE=DATE-TIME:20241119T140000Z
DTEND;VALUE=DATE-TIME:20241119T141500Z
DTSTAMP;VALUE=DATE-TIME:20260429T102143Z
UID:indico-contribution-25282@indico.ific.uv.es
DESCRIPTION:Speakers: Alexandre Salas Bernárdez (Universidad Complutense 
 de Madrid)\nPhenomenological evidence indicates that low-excitation hadron
 s often decay via the $^3P_0$ mechanism\, involving the creation of a ligh
 t quark-antiquark pair with zero angular momentum. This scalar decay term 
 arises spontaneously upon chiral symmetry breaking\, despite Quantum Chrom
 odynamics being mediated by spin-one gluons and displaying chiral symmetry
  in its Lagrangian. We explore this by employing the non-perturbative quar
 k-gluon vertex in the Landau gauge\, alongside a constant chromoelectric f
 ield background similar to the Schwinger pair production in Quantum Electr
 odynamics. Our results support the $^3P_0$ mechanism at momenta below the 
 fermion mass scale\, though ultrarelativistic fermions mostly exhibit $^3S
 _1$ quantum numbers. In QED\, $^3S_0$ dominates\, while in QCD\, $^3P_0$ i
 s favored at sub-GeV momenta due to the requirement of color singlet forma
 tion.\n\nhttps://indico.ific.uv.es/event/7664/contributions/25282/
LOCATION:
URL:https://indico.ific.uv.es/event/7664/contributions/25282/
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