Supersymmetric Sneutrino-Higgs inflation

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The R-parity violating decays of both Wino chargino and Wino neutralino LSPs are analyzed within the context of the B − L MSSM "heterotic standard model". These LSPs correspond to statistically determined initial soft supersymmetry breaking parameters which, when evolved using the renormalization group equations, lead to an effective theory satisfying all phenomenological requirements; including the observed electroweak vector boson and Higgs masses. The explicit decay channels of these LSPs into standard model particles, the analytic and numerical decay rates and the associated branching ratios are presented. The decay lengths of these RPV interactions are discussed. It is shown that the vast majority of these decays are "prompt", although a small, but calculable, number correspond to "displaced vertices" of various lengths. It is demonstrated that for a Wino chargino LSP, the NLSP is the Wino neutralino with a mass only slightly higher than the LSP-and vice-versa. As a consequence, we show that both the Wino chargino and Wino neutralino LSP/NLSP R-parity violating decays should be simultaneously observable at the CERN LHC.

supporting

confidence: 55%

R-parity violating decays of Wino chargino and wino neutralino LSPs and NLSPs at the LHC

Dumitru

Ovrut

Purves

2019

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“…The inflationary potential in [35] was constructed as follows. In order to help guarantee the stability of the potential energy, we first searched for a direction in scalar field space for which all of the above D-terms vanish.…”

Section: The Inflaton and The Inflationary Potentialmentioning

confidence: 99%

“…In [35], we used the formalism presented in [30] to statistically search the space of initial soft supersymmetry breaking parameters for those points which 1) satisfy the Planck2015 data by using the parameters presented in (28) while 2) simultaneously being consistent with all present low energy phenomenological data-that is, appropriate B-L and EW breaking, all lower bounds on SUSY sparticles and the experimentally measured lightest neutral Higgs mass. We refer the reader to [30] for details of this formalism.…”

Section: The Search For Valid Low Energy Pointsmentioning

confidence: 99%

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Perturbative reheating in Sneutrino-Higgs cosmology

Cai

Deen

Ovrut

et al. 2018

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The theory of perturbative reheating in the Sneutrino-Higgs cosmology of the B-L MSSM is presented. It is shown that following an epoch of inflation consistent with all Planck2015 data, the inflaton begins to oscillate around its minimum at zero and to reheat to various species of standard model and supersymmetric matter. The perturbative decay rates to this matter are computed, both analytically and numerically. Using these results, the Hubble parameter and the relative energy densities for each matter species, including that of the inflaton, are calculated numerically. The inflaton energy density is demonstrated to vanish at an energy scale of O(10 13 ) GeV, signaling the end of the period of reheating. The newly created matter background is shown to be in thermal equilibrium, with a reheating temperature of 1.13×10 13 GeV. To allow for a B-L breaking scale sufficiently smaller than the reheating scale, we extend the statistical method of determining the soft supersymmetry breaking parameters developed in previous work. The result is that one can determine a large number of phenomenologically realistic initial conditions for which the B-L breaking scale is an order of magnitude or more smaller than the reheating scale. 1

“…, n) depend on the structure of G and the pattern of symmetry breaking. Therefore, we will take non-semisimple groups as the unification symmetry, in particular SU(5) × U(1) and SO(10) × U(1), similar to previous works [3,5,7], where the role of the inflaton is played by the right-handed sneutrino [7,[21][22][23][24]. We will also embed the model into a supergravity framework, with the addition of a shift symmetry 1 which avoids the intrinsic η-problem [8,12,[25][26][27].…”

Section: Jhep06(2017)109mentioning

confidence: 99%

Sneutrino driven GUT inflation in supergravity

Gonzalo¹,

Heurtier²,

Moursy³

2017

In this paper, we embed the model of flipped GUT sneutrino inflation -in a flipped SU(5) or SO(10) set up -developed by Ellis et al. in a supergravity framework. The GUT symmetry is broken by a waterfall which could happen at early or late stage of the inflationary period. The full field dynamics is thus studied in detail and these two main inflationary configurations are exposed, whose cosmological predictions are both in agreement with recent astrophysical measurements. The model has an interesting feature where the inflaton has natural decay channels to the MSSM particles allowed by the GUT gauge symmetry. Hence it can account for the reheating after the inflationary epoch.