SMILE

Stochastic Models for the Inference of Life Evolution

Bibtex

@article{calibbi_gauge_2009,
Author = {Calibbi, L and Ferretti, Luca and Romanino, A and
Ziegler, R},
Title = {Gauge coupling unification, the {GUT} scale, and magic
fields},
Journal = {Physics Letters B},
Volume = {672},
Number = {2},
Pages = {152--157},
abstract = {We consider field sets that do not form complete SU(5)
multiplets, but exactly preserve the one-loop MSSM
prediction for
\$\backslash{}alpha3(MZ)\backslash{}alpha3(MZ)\$
independently of the value of their mass. Such fields
can raise the unification scale in different ways,
through a delayed convergence of the gauge couplings, a
fake unified running below the GUT scale, or a
postponed unification after a hoax crossing at a lower
scale. The
\$\backslash{}alpha3(MZ)\backslash{}alpha3(MZ)\$
prediction is independent of the mass of the new
fields, while the GUT scale often is not, which allows
to vary the GUT scale. Such "magic" fields represent a
useful tool in GUT model building. For example, they
can be used to fix gauge coupling unification in
certain two step breakings of the unified group, to
suppress large KK thresholds in models with extra
dimensions, or they can be interpreted as messengers of
supersymmetry breaking in GMSB models.},
doi = {doi:10.1016/j.physletb.2009.01.012},
year = 2009
}