10 research outputs found
Minimal extended flavor groups, matter fields chiral representations, and the flavor question
We show the specific unusual features on chiral gauge anomalies cancellation
in the minimal, necessarily 3-3-1, and the largest
3-4-1 weak isospin chiral gauge semisimple group leptoquark-bilepton
extensions of the 3-2-1 conventional standard model of nuclear and
electromagnetic interactions. In such models a natural explanation for the
fundamental question of fermion generation replication arises from the
self-consistency of a local gauge quantum field theory, which constrains the
number of the
QFD fermion families to the QCD color charges.Comment: 10 pages. <[email protected]
Testing the Nature of Kaluza-Klein Excitations at Future Lepton Colliders
With one extra dimension, current high precision electroweak data constrain
the masses of the first Kaluza-Klein excitations of the Standard Model gauge
fields to lie above TeV. States with masses not much larger than
this should be observable at the LHC. However, even for first excitation masses
close to this lower bound, the second set of excitations will be too heavy to
be produced thus eliminating the possibility of realizing the cleanest
signature for KK scenarios. Previous studies of heavy and production
in this mass range at the LHC have demonstrated that very little information
can be obtained about their couplings to the conventional fermions given the
limited available statistics and imply that the LHC cannot distinguish an
ordinary from the degenerate pair of the first KK excitations of the
and . In this paper we discuss the capability of lepton colliders
with center of mass energies significantly below the excitation mass to resolve
this ambiguity. In addition, we examine how direct measurements obtained on and
near the top of the first excitation peak at lepton colliders can confirm these
results. For more than one extra dimension we demonstrate that it is likely
that the first KK excitation is too massive to be produced at the LHC.Comment: 38 pages, 10 Figs, LaTex, comments adde
Comparison of Discovery Limits for Extra Z Bosons at Future Colliders
We study and compare the discovery potential for heavy neutral gauge bosons
() at various and colliders that are planned
or have been proposed. Typical discovery limits are for the TEVATRON
TeV, DI-TEVATRON TeV, LHC TeV, LSGNA (a 60 TeV collider)
TeV while the discovery limits are
with the large variation reflecting the model dependence of the limits. While
both types of colliders have comparable discovery limits the hadron colliders
are generally less dependent on the specific model and provide more robust
limits since the signal has little background. In contrast, discovery limits
for limits are more model dependent and because they are based on
indirect inferences of deviations from standard model predictions, they are
more sensitive to systematic errors.Comment: 13 pages, 1 figure (postscript), uses REVTEX, to be published in PR