12,178 research outputs found
Higgs Boson Mass Bounds in the Standard and Minimal Supersymmetric Standard Model with Four Generations
We study the question of distinguishability of the Higgs sector between the
standard model with four generations(SM4) and the minimal supersymmetric
standard model with four generations (MSSM4). We find that a gap exists between
the SM4 and MSSM4 Higgs boson masses for a range of the fourth generation
fermion mass considered in the analysis at a fixed top quark mass. We also
compare the Higgs boson mass bounds in these models with those in the standard
and the minimal supersymmetric standard models.Comment: 11 pages, Revtex, 3 postscript figures, accepted for publication in
Mod. Phys. Lett.
Spectral Decomposition of Missing Transverse Energy at Hadron Colliders
We propose a spectral decomposition to systematically extract information of
dark matter at hadron colliders. The differential cross section of events with
missing transverse energy (MET) can be expressed by a linear combination of
basis functions. In the case of -channel mediator models for dark matter
particle production, basis functions are identified with the differential cross
sections of sub-processes of virtual mediator and visible particle production
while the coefficients of basis functions correspond to dark matter invariant
mass distribution in the manner of the K\"all\'en-Lehmann spectral
decomposition. For a given MET data set and mediator model, we show that one
can differentiate a certain dark matter-mediator interaction from another
through spectral decomposition.Comment: 6+4 pages, 6 figures, PRL versio
Kinetic Energy Principle And Neoclassical Toroidal Torque In Tokamaks
It is shown that when tokamaks are perturbed the kinetic energy principle is closely related to the neoclassical toroidal torque by the action invariance of particles. Especially when tokamaks are perturbed from scalar pressure equilibria, the imaginary part of the potential energy in the kinetic energy principle is equivalent to the toroidal torque by the Neoclassical Toroidal Viscosity (NTV). A unified description therefore should be made for both physics. It is also shown in this case that the potential energy operator can be self-adjoint and thus the stability calculation can be simplified by minimizing the potential energ
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