42,872 research outputs found
Mirror dark matter will be confirmed or excluded by XENON1T
Mirror dark matter, where dark matter resides in a hidden sector exactly
isomorphic to the standard model, can be probed via direct detection
experiments by both nuclear and electron recoils if the kinetic mixing
interaction exists. In fact, the kinetic mixing interaction appears to be a
prerequisite for consistent small scale structure: Mirror dark matter halos
around spiral galaxies are dissipative - losing energy via dark photon
emission. This ongoing energy loss requires a substantial energy input, which
can be sourced from ordinary supernovae via kinetic mixing induced processes in
the supernova's core. Astrophysical considerations thereby give a lower limit
on the kinetic mixing strength, and indeed lower limits on both nuclear and
electron recoil rates in direct detection experiments can be estimated. We show
here that potentially all of the viable parameter space will be probed in
forthcoming XENON experiments including LUX and XENON1T. Thus, we anticipate
that these experiments will provide a definitive test of the mirror dark matter
hypothesis.Comment: about 10 page
Perceived noisiness under anechoic, semi-reverberant and earphone listening conditions
Magnitude estimates by each of 31 listeners were obtained for a variety of noise sources under three methods of stimuli presentation: loudspeaker presentation in an anechoic chamber, loudspeaker presentation in a normal semi-reverberant room, and earphone presentation. Comparability of ratings obtained in these environments were evaluated with respect to predictability of ratings from physical measures, reliability of ratings, and to the scale values assigned to various noise stimuli. Acoustic environment was found to have little effect upon physical predictive measures and ratings of perceived noisiness were little affected by the acoustic environment in which they were obtained. The need for further study of possible differing interactions between judged noisiness of steady state sound and the methods of magnitude estimation and paired comparisons is indicated by the finding that in these tests the subjects, though instructed otherwise, apparently judged the maximum rather than the effective magnitude of steady-state noises
The methods of paired comparisons and magnitude estimation in judging the noisiness of aircraft
The point of subjective equality in regard to perceived noisiness for each of 14 pairs of aircraft noises was obtained using both magnitude estimation technique and the method of paired comparisons. Both methods gave approximately the same estimates of the points of subjective equality for the noise pairs, and both showed similar correspondence to predictive physical measures. Nevertheless, the two methods appear to have greater face validity to the listeners. However, the magnitude estimation technique appears to be more efficient; for a given level of reliability it requires approximately 50% of the testing time required by the paired comparison method. The functions relating physical intensity to the estimated magnitude of subjective noisiness had slopes ranging from about .61 to .29 for the aircraft noises employed in this study, indicating a required change of about 5 to 10 db for a doubling in subjective magnitude. Some physical units of noise measurement were found to be very predictive (standard errors of estimate as low as 1.9 db) of the subjective judgements of noisiness
Quark-lepton symmetric model at the LHC
We investigate the quark-lepton symmetric model of Foot and Lew in the
context of the Large Hadron Collider (LHC). In this `bottom-up' extension to
the Standard Model, quark-lepton symmetry is achieved by introducing a gauged
`leptonic colour' symmetry which is spontaneously broken above the electroweak
scale. If this breaking occurs at the TeV scale, then we expect new physics to
be discovered at the LHC. We examine three areas of interest: the Z heavy
neutral gauge boson, charge exotic leptons, and a colour triplet
scalar diquark. We find that the LHC has already explored and/or will explore
new parameter space for these particles over the course of its lifetime.Comment: 24 pages, 6 figure
Phenomenology of a very light scalar (100 MeV 10 GeV) mixing with the SM Higgs
In this paper we investigate the phenomenology of a very light scalar, ,
with mass 100 MeV 10 GeV, mixing with the SM Higgs. As a benchmark
model we take the real singlet scalar extension of the SM. We point out
apparently unresolved uncertainties in the branching ratios and lifetime of
in a crucial region of parameter space for LHC phenomenology. Bounds from LEP,
meson decays and fixed target experiments are reviewed. We also examine
prospects at the LHC. For the dominant production mechanism
is via meson decay; our main result is the calculation of the differential
spectrum of scalars originating from B mesons and the subsequent
prediction of up to thousands of moderate (triggerable) displaced dimuons
possibly hiding in the existing dataset at ATLAS/CMS or at LHCb. We also
demonstrate that the subdominant production channel has the best
sensitivity for and that future bounds in this region could
conceivably compete with those of LEP.Comment: 13 pages, 9 figure
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