105,161 research outputs found
Heavy Quarkonium Potential Model and the State of Charmonium
A theoretical explanation of the observed splittings among the P~states of
charmonium is given with the use of a nonsingular potential model for heavy
quarkonia. We also show that the recently observed mass difference between the
center of gravity of the states and the state of
does not provide a direct test of the color hyperfine interaction in heavy
quarkonia. Our theoretical value for the mass of the state is in
agreement with the experimental result, and its E1 transition width is
341.8~keV. The mass of the state is predicted to be 3622.3~MeV.Comment: 15 page REVTEX documen
Signature of strong atom-cavity interaction on critical coupling
We study a critically coupled cavity doped with resonant atoms with
metamaterial slabs as mirrors. We show how resonant atom-cavity interaction can
lead to a splitting of the critical coupling dip. The results are explained in
terms of the frequency and lifetime splitting of the coupled system.Comment: 8 pages, 5 figure
BSM Primary Effects: The complete set of predictions from the dimension-6 BSM Lagrangian
We present a physical parameterization of the leading effects beyond the SM
(BSM), that give us, at present, the best way to constrain heavy new-physics at
low-energies. We call these effects that constrain all possible interactions at
the dimension 6 level, BSM Primary effects; there are 8 primaries related to
Higgs physics, 3 related to Triple Gauge Couplings and 7 related to Z- pole
measurements at LEP. Starting from these experimentally measurable deformations
(and not operators), we construct the dimension 6 Lagrangian in a bottom up
way. We, thus, show that other BSM effects are not independent from the primary
ones and we provide the explicit correlations. We also discuss the theoretical
expectation for the size of these BSM primaries in some well-motivated BSM
theories.Comment: Based on talk given at DIS 2014. This talk was completely based on
arXiv:1405.0181, which was written in collaboration with A. Pomarol and F.
Riv
Staggered fermion matrix elements using smeared operators
We investigate the use of two kinds of staggered fermion operators, smeared
and unsmeared. The smeared operators extend over a hypercube, and tend to
have smaller perturbative corrections than the corresponding unsmeared
operators. We use these operators to calculate kaon weak matrix elements on
quenched ensembles at , 6.2 and 6.4. Extrapolating to the continuum
limit, we find . The
systematic error is dominated by the uncertainty in the matching between
lattice and continuum operators due to the truncation of perturbation theory at
one-loop. We do not include any estimate of the errors due to quenching or to
the use of degenerate and quarks. For the
electromagnetic penguin operators we find
and . We also use the ratio of unsmeared to
smeared operators to make a partially non-perturbative estimate of the
renormalization of the quark mass for staggered fermions. We find that tadpole
improved perturbation theory works well if the coupling is chosen to be
\alpha_\MSbar(q^*=1/a).Comment: 22 pages, 1 figure, uses eps
Two photon quantum interference in plasmonics - Theory and Applications
We report perfect two photon quantum interference with near-unity visibility
in a resonant tunneling plasmonic structure in folded Kretschmann geometry.
This is despite absorption-induced loss of unitarity in plasmonic systems. The
effect is traced to perfect destructive interference between the squares of
amplitude reflection and transmission coefficients. We further highlight yet
another remarkable potential of coincidence measurements as a probe with better
resolution as compared to standard spectroscopic techniques. The finer features
show up in both angle resolved and frequency resolved studies.Comment: 5 pages, 6 figure
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