48,774 research outputs found
Dark Matter in the USSM
We discuss the neutralino dark matter within classes of extended
supersymmetric models, referred to as the USSM, containing one additional SM
singlet Higgs plus an extra Z', together with their superpartners the singlino
and bino'.Comment: 4 pages, 3 figs. Talk given at LCWS08, Chicago, IL, USA,
11/16-20/200
Extended Hylleraas three-electron integral
A closed form expression for the three-electron Hylleraas integral involving
the inverse quadratic power of one inter-particle coordinate is obtained, and
recursion relations are derived for positive powers of other coordinates. This
result is suited for high precision calculations of relativistic effects in
lithium and light lithium-like ions.Comment: Submited to Phys. Rev.
An SUSY GUT of flavour in 6d
We propose a 6d model with a SUSY gauge symmetry. After
compactification, it explains the origin of the Family Symmetry with CSD3
vacuum alignment, as well as breaking with doublet-triplet splitting.
The model naturally accounts for all quark and lepton (including neutrino)
masses and mixings, incorporating the highly predictive Littlest Seesaw
structure. It spontaneously breaks CP symmetry, resulting in successful CP
violation in the quark and lepton sectors, while solving the Strong CP problem.
It also explains the Baryon Asymmetry of the Universe (BAU) through
leptogenesis, with the leptogenesis phase directly linked to the Dirac and
Majorana phases.Comment: 23 pages, 6 figures. v3: Version published in JHE
LHC Signatures of the Constrained Exceptional Supersymmetric Standard Model
We discuss two striking Large Hadron Collider (LHC) signatures of the
constrained version of the exceptional supersymmetric standard model (cE6SSM),
based on a universal high energy soft scalar mass m_0, soft trilinear coupling
A_0 and soft gaugino mass M_{1/2}. The first signature we discuss is that of
light exotic colour triplet charge 1/3 fermions, which we refer to as
D-fermions. We calculate the LHC production cross section of D-fermions, and
discuss their decay patterns. Secondly we discuss the E6 type U(1)_N spin-1 Z'
gauge boson and show how it may decay into exotic states, increasing its width
and modifying the line shape of the dilepton final state. We illustrate these
features using two representative cE6SSM benchmark points, including an "early
LHC discovery" point, giving the Feynman rules and numerical values for the
relevant couplings in order to facilitate further studies.Comment: 30 pages, 5 figures, corrections to figure caption
Intense magnetic fields at 1 AU: Solar cycle 20
Of the intense magnetic fields (greater than 13 gamma) observed at 1 AU during solar cycle 20 (1973-1975), 92% were associated with shocks, stream interfaces, or cold magnetic enhancements (CMEs). Most (52%) of the magnetic field intensity enhancements occurred at stream interfaces; 27% occurred behind shocks without interfaces; and 11% occurred in CMEs. The most intense fields (25 gamma to 37 gamma) followed shocks. Magnetic field intensities at interfaces did not exceed 25 gamma, suggesting a mechanism such as a magnetoacoustic wave limits the intensity ahead of streams. Intense magnetic fields persist longest behind shocks
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