The Well-Tempered Neutralino

By N. Arkani-Hamed, Antonio Delgado, G. Giudice. 2006

460 citations recorded by the source corpus.

Abstract The dark-matter prediction is usually considered as one of the successes of low-energy supersymmetry. We argue that, after LEP constraints are taken into account, the correct prediction for the dark-matter density, at a quantitative level, is no longer a natural consequence of supersymmetry, but it requires special relations among parameters, highly sensitive to small variations. This is analogous to the problem of electroweak-symmetry breaking, where the correct value of the Z mass is obtained only with a certain degree of fine tuning. In the general parameter space of low-energy supersymmetry, one of the most plausible solution to reproduce the correct value of the dark-matter density is the well-tempered neutralino, which corresponds to the boundary between a pure bino and a pure higgsino or wino. We study the properties of well-tempered neutralinos and we propose a simple limit of split supersymmetry that realizes this situation.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/9b61a37980bc6340b3e1457984862e298cfb1bf2

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Citations in the corpus

In wino veritas? Indirect searches shed light on neutralino dark matter (2013, background): “The thermal history is the well-tempered scenario [31] (for earlier references, see [32–34]) while the non-thermal history could be one of or a mixture of those for the single states depending on the composition;”
Search for a scalar partner of the top quark in the jets plus missing transverse momentum final state at √s=13 TeV with the ATLAS detector (2017, unknown): “Well-tempered neutralino pMSSM: a pMSSM model in which three light neutralinos and a light chargino, which are mixtures of bino and higgsino states, are considered with masses within 50 GeV of the lightest state [90, 91].”
Mini-Split (2012, background): “Dark Matter in this model cannot be the bino — it is always overproduced by at least a factor of 50, as the main annihilation channel is t-channel higgsino exchange which is p-wave and the cross-section is suppressed by μ−2 [18].”
Cosmological Moduli and the Post-Inflationary Universe: A Critical Review (2015, background): “Whereas a thermal Bino typically gives a relic density that is too high, unless its annihilation cross section is boosted through major co-annihilation effects [54] or mixing with the Higgsino [53].”
Physics opportunities of a 100 TeV proton–proton collider (2015, background): “Another interesting possibility is minimally split supersymmetry [40, 41, 42, 43, 44, 45].”
Implications of the 125 GeV Higgs boson for scalar dark matter and for the CMSSM phenomenology (2011, unknown): “called well-tempered neutralino [60], i.”
Higgs mass and vacuum stability in the Standard Model at NNLO (2012, background): “On the other hand, (mildly “unnatural”) scenarios in which the masses of supersymmetric scalars are one-loop larger than the weak scale [62–64] are in good agreement with data.”
Dark Matter through the Higgs portal (2019, background): “In phenomenological realization of the MSSM, the well tempered regime can be realized also through bino–wino [552–554] or even bino–wino– higgsino [555, 556] admixtures.”
Accidental composite dark matter (2015, background): “Furthermore, in our scenario TCb have a common mass mB generated by strong dynamics and are mildly split by techni-quark masses and gauge interactions: thereby the spectrum resembles the case known as ‘well tempered neutralinos’ [39].”