63,410 research outputs found
Slepton Oscillation at Large Hadron Collider
Measurement of Lepton-Flavor Violation (LFV) in the minimal SUSY Standard
Model (MSSM) at Large Hadron Collider (LHC) is studied based on a realistic
simulation. We consider the LFV decay of the second-lightest neutralino,
, in the case
where the flavor mixing exists in the right-handed sleptons. We scan the
parameter space of the minimal supergravity model (MSUGRA) and a more generic
model in which we take the Higgsino mass as a free parameter. We find
that the possibility of observing LFV at LHC is higher if is smaller than
the MSUGRA prediction; the LFV search at LHC can cover the parameter range
where the decay can be suppressed by the cancellation among
the diagrams for this case.Comment: 29 pages, 10 figure
High-Mass Supersymmetry with High Energy Hadron Colliders
While it is natural for supersymmetric particles to be well within the mass
range of the large hadron collider, it is possible that the sparticle masses
could be very heavy. Signatures are examined at a very high energy hadron
collider and an very high luminosity option for the Large Hadron Collider in
such scenarios
Intensity issues and machine protection of the HE-LHC
The HE-LHC study investigates the possibilities for upgrading the beam energy
of the Large Hadron Collider CERN from 7 TeV to 16.5 TeV. This paper presents a
preliminary investigation of intensity issues and machine protection for the
HE-LHC.Comment: 4 pages, contribution to the EuCARD-AccNet-EuroLumi Workshop: The
High-Energy Large Hadron Collider, Malta, 14 -- 16 Oct 2010; CERN Yellow
Report CERN-2011-003, pp. 124-12
Supersymmetric Monojets at the Large Hadron Collider
Supersymmetric monojets may be produced at the Large Hadron Collider by the
process qg -> squark neutralino_1 -> q neutralino_1 neutralino_1, leading to a
jet recoiling against missing transverse momentum. We discuss the feasibility
and utility of the supersymmetric monojet signal. In particular, we examine the
possible precision with which one can ascertain the neutralino_1-squark-quark
coupling via the rate for monojet events. Such a coupling contains information
on the composition of the neutralino_1 and helps bound dark matter direct
detection cross-sections and the dark matter relic density of the neutralino_1.
It also provides a check of the supersymmetric relation between gauge couplings
and gaugino-quark-squark couplings.Comment: 46 pages, 10 figures. The appendix has been rewritten to correct an
error that appears in all previous versions of the appendix. This error has
no effect on the results in the main body of the pape
Dijet asymmetry at the Large Hadron Collider
The MARTINI numerical simulation allows for direct comparison of theoretical
model calculations and the latest results for dijet asymmetry from the ATLAS
and CMS collaborations. In this paper, partons are simulated as undergoing
radiative and collisional processes throughout the evolution of central
lead-lead collisions at the Large Hadron Collider. Using hydrodynamical
background evolution determined by a simulation which fits well with the data
on charged particle multiplicities from ALICE and a value of , the dijet asymmetry is found to be consistent with partonic energy
loss in a hot, strongly-interacting medium.Comment: 8 pages, 3 figures. For version 2: ATLAS' latest analysis is
included, with some comments and minor changes of wordin
Monotop phenomenology at the Large Hadron Collider
We investigate new physics scenarios where systems comprised of a single top
quark accompanied by missing transverse energy, dubbed monotops, can be
produced at the LHC. Following a simplified model approach, we describe all
possible monotop production modes via an effective theory and estimate the
sensitivity of the LHC, assuming 20 fb of collisions at a center-of-mass
energy of 8 TeV, to the observation of a monotop state. Considering both
leptonic and hadronic top quark decays, we show that large fractions of the
parameter space are reachable and that new physics particles with masses
ranging up to 1.5 TeV can leave hints within the 2012 LHC dataset, assuming
moderate new physics coupling strengths.Comment: 17 pages, 12 figures, 3 table
Minimal Matter at the Large Hadron Collider
We classify all possible new U(1) x SU(2) x SU(3) multiplets that can couple
to pairs of SM particles. Assuming that production of such new particles is
dominated by their gauge interactions we study their signals at LHC, finding
the following five main classes: i) lepto-quark 2l 2q signals; ii) di-lepton 4l
signals; iii) di-quarks 4j signals, iv) heavy-lepton 2l 2V signals and v) heavy
quarks 2j 2V signals, where V denotes heavy SM vectors (with W being associated
to exotic fermions). In each case we outilne the most promising final states,
the SM backgrounds and propose the needed searches.Comment: 24 pages, 10 figures. Typos fixed; Addendum about the capabilities of
the on-going LHC run at 7 Te
Deconstruction: Large Hadron Collider
As the worldâs largest science experiment, the LHC is the subject of many interesting and unusual facts and statistics
eta_c production at the Large Hadron Collider
We have studied the production of the 1S_0 charmonium state, eta_c, at the
Large Hadron Collider (LHC) in the framework of Non-Relativistic Quantum
Chromodynamics (NRQCD) using heavy-quark symmetry. We find that NRQCD predicts
a large production cross-section for this resonance at the LHC even after
taking account the small branching ratio of eta_c into two photons. We show
that it will be possible to test NRQCD through its predictions for eta_c, with
the statistics that will be achieved at the early stage of the LHC, running at
a center of mass energy of 7 TeV with an integrated luminosity of 100 pb^{-1}Comment: 8 pages, 2 figure
Scalar Quarks at the Large Hadron Collider
The properties of scalar quarks are studied, especially the formation of
fermionic mesons with an anti-quark. On the basis of this theoretical
investigation together with the experimental data, both from last year and from
this year, of the ATLAS Collaboration and the CMS Collaboration at the Large
Hadron Collider, it is proposed that the standard model of Glashow, Weinberg,
and Salam should be augmented by scalar quarks, scalar leptons, and additional
fermions. If these scalar quarks and scalar leptons are in one-to-one
correspondence with the ordinary quarks and ordinary leptons, either in number
or in the degrees of freedom, then there may be a fermion-boson symmetry. The
fermion-boson symmetry obtained this way is of a different nature from that of
supersymmetry.Comment: 7 pages, 1 figur
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