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SUMMARY:Electroweak Chiral Lagrangian with a Light Higgs and photon photon
  → WL WL\,  ZL ZL at the One-Loop Level
DTSTART;VALUE=DATE-TIME:20140408T100000Z
DTEND;VALUE=DATE-TIME:20140408T110000Z
DTSTAMP;VALUE=DATE-TIME:20261015T214718Z
UID:indico-event-2096@indico.ific.uv.es
DESCRIPTION:The photon photon scattering into longitudinal electroweak gau
 ge bosons can be used to discern new physics in present a future collider 
 experiments. We take an effective field theory approach where we consider 
 the electroweak chiral Lagrangian including a light Higgs-like scalar (ECL
 h) as a dynamical light field together with the would-be-Goldstone bosons 
 associated to the electroweak symmetry breaking.\n\n    This description a
 ssumes the existence of a mass gap between mh\, mW\, mZ and the potential 
 new emergent resonances\, setting an intermediate energy region (above mh\
 ,MW\,MZ and below the resonance masses) where the use of the ECLh is the m
 ost appropriate tool to compute the relevant observables.\n\n    We analyz
 e in detail the proper chiral counting rules for the present case\, the ph
 oton-photon scattering. The amplitude is computed within this effective th
 eory framework up to next-to-leading order\, i.e.\, up to the one-loop lev
 el (only bosonic contributions so far). The distinctive signal we found in
  our theoretical prediction leads to interesting implications both theoret
 ically and experimentally. After extremely subtle cancellations the final 
 amplitudes are UV finite\, being determined by a set of renormalization gr
 oup invariant combinations of effective couplings. We finally propose a jo
 int analysis of our results for the photon-photon scattering amplitudes to
 gether with other photonic processes and electroweak precission observable
 s for a future comparison with data. This could help to disantangle the na
 ture of the light Higgs-like particle.\n\nhttps://indico.ific.uv.es/event/
 2096/
LOCATION:IFIC Seminar Room 1.1.1
URL:https://indico.ific.uv.es/event/2096/
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