8,631 research outputs found
Large scale separation and resonances within LHC range from a prototype BSM model
Many theories describing physics beyond the Standard Model rely on a large
separation of scales. Large scale separation arises in models with mass-split
flavors if the system is conformal in the ultraviolet but chirally broken in
the infrared. Because of the conformal fixed point, these systems exhibit
hyperscaling and a highly constrained resonance spectrum. We derive
hyperscaling relations and investigate the realization of one such system with
four light and eight heavy flavors. Our numerical simulations confirm that both
light-light and heavy-heavy resonance masses show hyperscaling and depend only
on the ratio of the light and heavy flavor masses. The heavy-heavy spectrum is
qualitatively different from QCD and exhibits quarkonia with masses not
proportional to the constituent quark mass. These resonances are only a few
times heavier than the light-light ones, which would put them within reach of
the LHC.Comment: 6 pages, 3 figures. Version published in PLB, updated figures show in
addition data at a second beta value strengthening our conclusion
Investigating BSM Models with Large Scale Separation
Mass-split systems based on a conformal infrared fixed point provide a
low-energy effective description of beyond the standard model systems with
large scale separation. We report results of exploratory investigations with
four light and eight heavy flavors using staggered fermions, and up to five
different values for the light flavor mass, five different heavy flavor masses,
and two values of the bare gauge coupling.Comment: 8 pages, 7 figures; Talk presented at the 35th International
Symposium on Lattice Field Theory, 18 - 24 June 2017, Granada, Spai
Testing Fermion Universality at a Conformal Fixed Point
Universality of various fermion formulations is well established in QCD-like
theories defined around the perturbative fixed point. These arguments
do not apply for conformal systems that exhibit an infrared fixed point at
non-vanishing coupling. We investigate the step scaling function for
systems with 10 or 12 fundamental flavors using domain wall fermions and
compare it to perturbative predictions. We test universality by contrasting our
findings to results published in the literature based on staggered fermions.Comment: Talk given at the 35th International Symposium on Lattice Field
Theory, 18 - 24 June 2017, Granada, Spain ; 8 page
Adjustment of carbon fluxes to light conditions regulates the daily turnover of starch in plants : a computational model
Peer reviewedPublisher PD
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