6,620 research outputs found
Bounds on Universal Extra Dimension from LHC Run I and II data
We discuss the collider bounds on minimal Universal Extra Dimension (mUED)
model from LHC Run-I and II data. The phenomenology of mUED is determined by
only two parameters namely, the compactification scale () of the extra
dimension and cutoff scale () of the theory. The characteristic
feature of mUED is the occurrence of nearly degenerate mass spectrum for the
Kaluza-Klein (KK) particles and hence, soft leptons, soft jets at the collider
experiments. The degree of degeneracy of KK-mass spectrum crucially depends on
. The strongest direct bound on (950 GeV for large
) arises from a search for a pair of soft dimuons at the Large Hadron
Collider (LHC) experiment with 8 TeV center-of-mass energy and integrated luminosity. However, for small and hence, small
splitting within the first KK-level, the bounds from the dimuon channel is
rather weak. On the other hand, the discovery of 126 GeV Higgs boson demands
small to prevent the scalar potential form being unbounded from
below. We discuss LHC monojet searches as a probe of low region of
mUED parameter space. We also compute bounds on the mUED parameter space from
13 TeV multijets results.Comment: 6 pages, 3 figure
Top off the unparticle
The existence of an exactly scale invariant sector possessing a non-trivial
infrared fixed point at a higher energy scale and its possible communication
with the Standard Model particles through a heavy messenger sector has been
shown to lead to curious unparticle effects. We demonstrate that top physics at
the Tevatron can already constrain such theories. We also consider possible
improvements at the LHC and delineate some striking signatures.Comment: 5 page
Non-Standard Neutrino Interactions : Obviating Oscillation Experiments
Searching for non-standard neutrino interactions, as a means for discovering
physics beyond the Standard Model, has one of the key goals of dedicated
neutrino experiments, current and future. We demonstrate here that much of the
parameter space accessible to such experiments is already ruled out by the RUN
II data of the Large Hadron Collider experiment.Comment: 5 pages, 2 figure
Little Higgs after the little one
At the LHC, the Littlest Higgs Model with -parity is characterised by
various production channels. If the -odd quarks are heavier than the exotic
partners of the and the , then associated production can be as important
as the pair-production of the former. Studying both, we look for final states
comprising at least one lepton, jets and missing transverse energy. We consider
all the SM processes that could conspire to contribute as background to our
signals, and perform a full detector level simulation of the signal and
background to estimate the discovery potential at the current run as well as at
the scheduled upgrade of the LHC. We also show that, for one of the channels,
the reconstruction of two tagged -jets at the Higgs mass provides us with an unambiguous hint for this model.Comment: 22 pages, 3 captioned figures, 8 Tables; minor modifications, version
published in JHE
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