Impact of vacuum stability, perturbativity and XENON1T on global fits of $$\mathbb {Z}_2$$ and $$\mathbb {Z}_3$$ scalar singlet dark matter

Athron, Peter; Cornell, Jonathan M.; Kahlhoefer, Felix; McKay, James; Scott, Pat; Wild, Sebastian

doi:10.1140/epjc/s10052-018-6314-y

Cited by 93 publications

(91 citation statements)

References 94 publications

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“…Previously global fits of DM models, e.g., Ref. [21,22], included at most parametric uncertainties. We can now, however, incorporate coherently all major sources of uncertainty in DD experiments in official limits and global fits.…”

Section: Discussionmentioning

confidence: 99%

“…The number of terms in the sum is equal to the number of unique ways of partitioning q into any number of smaller terms, i.e., the partition function of q. The first ten partitions are 1,2,3,5,7,11,15,22,30 and 42, and, asymptotically, the number of partitions grows exponentially with q. The formula allows us to express complicated moments of a multinomial in terms of simpler ones; in this regard, it is similar to Wick's theorem for Gaussian moments.…”

Section: A Averaged Poisson Likelihoodmentioning

confidence: 99%

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Non-parametric uncertainties in the dark matter velocity distribution

Fowlie

2019

J. Cosmol. Astropart. Phys.

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We investigate the impact of uncertainty in the velocity distribution of dark matter on direct detection experiments. We construct an multinomial prior with a hyperparameter β that describes the strength of our belief in an isotropic Maxwell-Boltzmann velocity distribution. By varying β, we interpolate between a halo-independent and halo-dependent analysis. We present a novel approximation for the marginalisation of this prior that is applicable to any counting experiment. With this formula, we investigate the impact of the uncertainty in limits from XENON1T. For dark matter masses greater than about 60 GeV, we find extremely mild sensitivity to the distribution. Below about 60 GeV, the limit weakens by less than an order of magnitude if we assume an isotropic distribution in the galactic frame. If we permit anisotropic distributions, the limit further weakens, but at most by about two orders of magnitude. Lastly, we check the impact of parametric uncertainties and discuss the possible inclusion and impact of our technique in global fits.

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Section: Discussionmentioning

confidence: 99%

Section: A Averaged Poisson Likelihoodmentioning

confidence: 99%

Non-parametric uncertainties in the dark matter velocity distribution

Fowlie

2019

J. Cosmol. Astropart. Phys.

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“…A global likelihood fit of the Z 3 singlet dark matter was recently made with the GAM-BIT code [79]. This study did not, however, take into account the improvements included in this work, in particular refined unitarity bounds and treatment of early kinetic decoupling.…”

Section: Introductionmentioning

confidence: 99%

Improved bounds on ℤ3 singlet dark matter

Hektor

Hryczuk

Kannike

2019

J. High Energ. Phys.

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We reconsider complex scalar singlet dark matter stabilised by a Z 3 symmetry. We refine the stability bounds on the potential and use constraints from unitarity on scattering at finite energy to place a stronger lower limit on the direct detection cross section. In addition, we improve the treatment of the thermal freeze-out by including the evolution of the dark matter temperature and its feedback onto relic abundance. In the regions where the freeze-out is dominated by resonant or semi-annihilation, the dark matter decouples kinetically from the plasma very early, around the onset of the chemical decoupling. This results in a modification of the required coupling to the Higgs, which turns out to be at most few per cent in the semi-annihilation region, thus giving credence to the standard approach to the relic density calculation in this regime. In contrast, for dark matter mass just below the Higgs resonance, the modification of the Higgs invisible width and direct and indirect detection signals can be up to a factor 6.7. The model is then currently allowed at 56.8 GeV to 58.4 GeV (depending on the details of early kinetic decoupling) M S 62.8 GeV and at M S 122 GeV if the freeze-out is dominated by semi-annihilation. We show that the whole large semi-annihilation region will be probed by the near-future measurements at the XENONnT experiment.

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“…However, such a term can be removed by performing a constant shift in S which also redefines µ 2 S , µ 2 Φ , µ 3 , g S and µ ΦS . 1 In writing the above Lagrangians, we have assumed that these parameters are defined after a constant shift in S. If we set µ 3 = g S = µ ΦS = 0, we can see that the above Lagrangian becomes Z 2 symmetric under S → −S, i.e., it is even in S. In this case, the fermion DM ψ is decoupled and becomes a hidden DM candidate, whereas the scalar S serves as a new DM candidate and reproduces the scalar Higgs portal model [36,[72][73][74][75][76][77][78][79][80][81].…”

Section: Singlet Fermion Dark Matter Modelmentioning

confidence: 94%

Gravitational waves and electroweak baryogenesis in a global study of the extended scalar singlet model

Beniwal

Lewicki

White

et al. 2019

J. High Energ. Phys.

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We perform a global fit of the extended scalar singlet model with a fermionic dark matter (DM) candidate. Using the most up-to-date results from the Planck measured DM relic density, direct detection limits from the XENON1T (2018) experiment, electroweak precision observables and Higgs searches at colliders, we constrain the 7dimensional model parameter space. We also find regions in the model parameter space where a successful electroweak baryogenesis (EWBG) can be viable. This allows us to compute the gravitational wave (GW) signals arising from the phase transition, and discuss the potential discovery prospects of the model at current and future GW experiments. Our global fit places a strong upper and lower limit on the second scalar mass, the fermion DM mass and the scalar-fermion DM coupling. In agreement with previous studies, we find that our model can simultaneously yield a strong first-order phase transition and saturate the observed DM abundance. More importantly, the GW spectra of viable points can often be within reach of future GW experiments such as LISA, DECIGO and BBO.

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Impact of vacuum stability, perturbativity and XENON1T on global fits of $$\mathbb {Z}_2$$ and $$\mathbb {Z}_3$$ scalar singlet dark matter

Cited by 93 publications

References 94 publications

Non-parametric uncertainties in the dark matter velocity distribution

Non-parametric uncertainties in the dark matter velocity distribution

Improved bounds on ℤ3 singlet dark matter

Gravitational waves and electroweak baryogenesis in a global study of the extended scalar singlet model

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