70,785 research outputs found
Dispersion Relations Explaining OPERA Data From Deformed Lorentz Transformation
OPERA collaboration has reported evidence of superluminal phenomenon for
neutrinos. One of the possible ways to explain the superluminality is to have
Lorentz symmetry violated. It has been shown that dispersion relations put
forwards has the problem of physics laws vary in different inertial frames
leading to conflicting results on Cherenkov-like radiation, pion decay and high
energy neutrino cosmic ray. For theories with deformed Lorentz symmetry, by
modifying conservation laws corresponding to energy and momentum in the usual
Lorentz invariant theory, it is possible to have superluminal effect and at the
same time avoid to have conflicts encountered in Lorentz violating theories. We
study dispersion relations from deformed Lorentz symmetry. We find that it is
possible to have dispersion relations which can be consistent with data on
neutrinos. We show that once the superluminality as a function of
energy is known the corresponding dispersion relation in the deformed Lorentz
symmetry can be determined.Comment: 8 pages, 2 figures. Several typos corrected and some references adde
Measuring the ratio of and couplings through production
For a generic Higgs boson, measuring the relative sign and magnitude of its
couplings with the and bosons is essential in determining its origin.
Such a test is also indispensable for the 125-GeV Higgs boson. We propose that
the ratio of the and couplings can be directly
determined through the production, where denotes a generic Higgs
boson, owing to the tree-level interference effect. While this is impractical
at the LHC due to the limited sensitivity, it can be done at future
colliders, such as a 500-GeV ILC with the beam polarization
in the and
channels. The discovery potential of a
general ratio and the power to discriminate it from the SM value are studied in
detail. Combining the cross section of with the
measurements of coupling at the HL-LHC, one can further improve the
sensitivity of .Comment: 24 pages, 10 figures, 2 table
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