CERN LHC sensitivity to the resonance spectrum of a minimal strongly interacting electroweak symmetry breaking sector

Abstract

We present a unified analysis of the two main production processes of vector boson pairs at the CERN LHC, VV-fusion and qq annihilation, in a minimal strongly interacting electroweak symmetry breaking sector. Using a unitarized electroweak chiral Lagrangian formalism and modeling the final V L V L strong rescattering effects by a form factor, we describe qq annihilation processes in terms of the two chiral parameters that govern elastic V L V L scattering. Depending on the values of these two chiral parameters, the unitarized amplitudes may present resonant enhancements in different angular momentum-isospin channels. Scanning this two parameter space, we generate the general resonance spectrum of a minimal strongly interacting electroweak symmetry breaking sector and determine the regions that can be probed at the CERN LHC.

If no Higgs then what?

“…refs. [60][61][62][63][64][65]). We review the main results of these analyses and we extend them by a study of the LHC discovery potential.…”

Study of the Electroweak Symmetry Breaking Sector for the LHC

“…The old electroweak chiral Lagrangian (ECL) [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21], based on standard chiral perturbation theory (ChPT) of QCD [46][47][48][49], assumed a Higgsless model, but solved the problems that the Higgs was intended for by supposing a strongly interacting regime for the EWSBS instead. In view that the h has been found, it can be extended to include the new Higgs-like particle found at the LHC (refs.…”

“…[1][2][3]). The tools of Effective Chiral Lagrangians and unitarization procedures will be used, and the old Higgsless Electroweak Chiral Lagrangian [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21](EChL) will be extended to accommodate a Higgs-like boson at ∼ 125 GeV. Since the discovery of the Higgs-like boson at the LHC, this field has received increasing attention [22][23][24][25][26][27][28][29][30][31][32][33].…”

Interpreting a 2 TeV resonance inWWscattering

“…The operators O i include the complete set of operators defined, e.g., in [1,19,20]. We will be interested in WW scattering and work in the strict custodial limit.…”

“…Neglecting the gauge boson mass (quite justified at 2 TeV), unitarity requires the form factor to obey the following relation within a vector-dominance region [20] ImF V ðsÞ ¼ t…”