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SUMMARY:One-Loop Calculation of the Oblique S Parameter in Higgsless Elect
 roweak Models - Sanz Cillero\, JJ (Istituto Nazionale di Fisica Nucleare\,
  Bari)
DTSTART:20120626T163000Z
DTEND:20120626T164500Z
UID:TALK38662@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:If the Higgs boson does not show up soon\, we should look for 
 alternative mechanisms of mass generation\, satisfying the many experiment
 al constraints which the Standard Model (SM) has successfully fulfilled so
  far. Following this aim\, we present a one-loop calculation of the obliqu
 e S parameter within Higgsless models of Electroweak Symmetry Breaking (EW
 SB) and analyze the phenomenological implications of the available electro
 weak precision data. By means of an effective Lagrangian we implement the 
 chiral symmetry breaking SU(2)_L x SU(2)_R -> SU(2)_(L+R) with Goldstones\
 , gauge bosons and one multiplet of vector and axial-vector massive resona
 nce states. Using the dispersive representation of Peskin and Takeuchi and
  imposing the short-distance constraints dictated by the operator product 
 expansion\, we obtain S at the next-to-leading order in terms of a few res
 onance parameters. We have found that\, in order to match the experimental
  determination of the S parameter\, the res onance masses are required to 
 be over the TeV scale in this kind of strongly-coupled EWSB scenarios.\n
LOCATION:Seminar Room 2\, Newton Institute Gatehouse
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