Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-12-22
JHEP 0403 (2004) 042
Physics
High Energy Physics
High Energy Physics - Phenomenology
21 pages, 8 figures, JHEP format (published version, some minor clarifying sentences added)
Scientific paper
10.1088/1126-6708/2004/03/042
We investigate unitarity of $W^+W^-$ scattering in the context of theory space models of the form $U(1)\times {[SU(2)]}^N\times SU(2)_{N+1}$, which are broken down to $U(1)_{EM}$ by non-linear $\Sigma$ fields, without the presence of a physical Higgs Boson. By allowing the couplings of the U(1) and the final $SU(2)_{N+1}$ to vary, we can fit the $W$ and $Z$ masses, and we find that the coefficient of the term in the amplitude that grows as $E^2/m_W^2$ at high energies is suppressed by a factor of $(N+1)^{-2}$. In the $N+1\to\infty$ limit the model becomes a 5-dimensional SU(2) gauge theory defined on an interval, where boundary terms at the two ends of the interval break the SU(2) down to $U(1)_{EM}$. These boundary terms also modify the Kaluza-Klein (KK) mass spectrum, so that the lightest KK states can be identified as the $W$ and $Z$ bosons. The $T$ parameter, which measures custodial symmetry breaking, is naturally small in these models. Depending on how matter fields are included, the strongest experimental constraints come from precision electroweak limits on the $S$ parameter.
Foadi Roshan
Gopalakrishna Shrihari
Schmidt Carl
No associations
LandOfFree
Higgsless Electroweak Symmetry Breaking from Theory Space does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Higgsless Electroweak Symmetry Breaking from Theory Space, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Higgsless Electroweak Symmetry Breaking from Theory Space will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-323120