22,938 research outputs found
Dynamics of a two-level system under the simultaneous influence of a spin bath and a boson bath
We study dynamics of a two-level system coupled simultaneously to a pair of
dissimilar reservoirs, namely, a spin bath and a boson bath, which are
connected via finite interbath coupling. It is found that the steady-state
energy transfer in the two-level system increases with its coupling to the spin
bath while optimal transfer occurs at intermediate coupling in the transient
process. If the two-level system is strongly coupled to the spin bath, the
population transfer is unidirectional barring minor population oscillations of
minute amplitudes. If the spin bath is viewed as an atomic ensemble, robust
generation of macroscopic superposition states exists against parameter
variations of the two-level system and the boson bath.Comment: 12 pages, 4 figure
One-loop QCD correction to top pair production in the littlest Higgs model with T-parity at the LHC
In this work, we investigate the one-loop QCD correction to top pair
production in the littlest Higgs model with T-parity at the LHC. We calculate
the relative correction of the top pair production cross section and
top-antitop spin correlation at the LHC for TeV. We find that
the relative corrections of top pair production cross section can reach about
, and the top-antitop spin correlation can reach () at the
8(14) TeV LHC in the favorable parameter space
One-loop effects on top pair production in the littlest Higgs model with T-parity at the LHC
In this work, we systematically investigate the one-loop corrections to
production in the littlest Higgs model with T-parity (LHT) at the
LHC for TeV. We focus on the effects of LHT particles on
cross section, polarization asymmetries, spin correlation and charge
asymmetry at the LHC. We also study the top quark forward-backward asymmetry at
Tevatron and its correlations with the LHC observables. We found that: (1) the
contributions of the LHT particles to production can only reach
about 1% at the 14 TeV LHC. Meanwhile, the anomalous top quark forward-backward
asymmetry at Tevatron is also hardly to be explained in the LHT model. (2) the
parity violating asymmetries in production, such as left-right
asymmetry and the polarization can respectively reach 1.1%
and 0.5%, which may have the potential to provide a signal of LHT at the LHC.Comment: Accepted for publication in the European Physical Journal
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