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SUMMARY:Decoupling relations\, effective Lagrangians and low-energy theore
 ms
DTSTART;VALUE=DATE-TIME:19980904T100000Z
DTEND;VALUE=DATE-TIME:19980904T110000Z
DTSTAMP;VALUE=DATE-TIME:20260622T123710Z
UID:indico-event-1086@indico.ific.uv.es
DESCRIPTION:If QCD is renormalized by minimal subtraction\, at higher orde
 rs\, alpha_s and m_q exhibit discontinuities at the flavour thresholds\, w
 hich are controlled by so-called decoupling constants\, zeta_g and zeta_m\
 , respectively. Adopting the MS-bar scheme\, we derive simple formulae whi
 ch reduce the calculation of zeta_g and zeta_m to the solution of vacuum i
 ntegrals. This allows us to evaluate zeta_g and zeta_m through three loops
 . We also establish low-energy theorems\, valid to all orders\, which rela
 te the effective couplings of a CP-even Higgs boson to gluons and light qu
 arks\, due to the virtual presence of a heavy quark h\, to the logarithmic
  derivatives w.r.t. m_h of zeta_g and zeta_m\, respectively. We also consi
 der the effective QCD interactions of a CP-odd Higgs boson and verify the 
 Adler-Bardeen nonrenormalization theorem at three loops.\n\nhttps://indico
 .ific.uv.es/event/1086/
LOCATION:Dpto. de Fisica Teorica (UVEG) Sala Seminarios
URL:https://indico.ific.uv.es/event/1086/
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