DAMPE squib? Significance of the 1.4 TeV DAMPE excess

Fowlie, Andrew

doi:10.1016/j.physletb.2018.03.006

Cited by 25 publications

(27 citation statements)

References 35 publications

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“…The most attention is devoted to misaligned datapoint at energy of around 1.5 TeV. Despite the deviation less than 3σ [17], it is often considered as a small line-like signal from DM [18][19][20][21][22]. However, there are also plenty of works considering the broad excess over the background flux, and it is often viewed as DM signal too (see [23] for references).…”

Section: Possible Electron-positron Excess Registered By Dampementioning

confidence: 99%

Indirect effects of dark matter

Belotskiy

Esipova

Kamaletdinov

et al. 2019

Int. J. Mod. Phys. D

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Here we briefly review possible indirect effects of dark matter (DM) of the Universe. It includes effects in cosmic rays (CR): first of all, the positron excess at ∼ 500 GeV and possible electron-positron excess at 1-1.5 TeV. We tell that the main and least model-dependent constraint on such possible interpretation of CR effects goes from gamma-ray background. Even ordinary e + e − mode of DM decay or annihilation produces prompt photons (FSR) so much that it leads to contradiction with data on cosmic gamma-rays. We present our attempts to possibly avoid gamma-ray constraint. They concern peculiarities of both space distribution of DM and their physics. The latter involves complications of decay/annihilation modes of DM, modifications of Lagrangian of DM-ordinary matter interaction, and inclusion of mode with identical fermions in final state. In this way, no possibilities to suppress were found yet except, possibly, mode with identical fermions. While the case of spatial distribution variation allows achieving consistency between different data. Also we consider stable form of dark matter which can interact with baryons. We show which constraint such DM candidate can get from damping effect in plasma during large scale structure formation in comparison with other existing constraints.

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Section: Possible Electron-positron Excess Registered By Dampementioning

confidence: 99%

Indirect effects of dark matter

Belotskiy

Esipova

Kamaletdinov

et al. 2019

Int. J. Mod. Phys. D

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show abstract

“…5 Under the asymptotic conditions required by the Gross-Vitells method, N doesn't depend on the luminosity. 6 Note that ATLAS [1] corrected for look-elsewhere effects in the ranges 110 -600 GeV and 110 -150 GeV, whilst CMS [2] corrected for them in the ranges 115 -130 GeV and 110 -145 GeV. The narrower ranges reflected indirect constraints and exclusion limits from previous experiments and mitigated edge effects at the boundaries of the data.…”

Section: Bayesian Model Comparisonmentioning

confidence: 99%

“…[3]) and recent (see e.g., ref. [4]) criticism, we recently advocated [5,6] an alternative methodology based on Bayes factors, reviewed in sec. IV.…”

Section: Introductionmentioning

confidence: 99%

Bayesian and frequentist approaches to resonance searches

Fowlie¹

2019

J. Inst.

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We investigate Bayesian and frequentist approaches to resonance searches using a toy model based on an ATLAS search for the Higgs boson in the diphoton channel. We draw pseudo-data from the background only model and background plus signal model at multiple luminosities, from 10 −3 /fb to 10 7 /fb. We chart the change in the Bayesian posterior of the background only model and the global p-value. We find that, as anticipated, the posterior converges to certainty about the model as luminosity increases. The p-value, on the other hand, randomly walks between 0 and 1 if the background only model is true, and otherwise converges to 0. After briefly commenting on the frequentist properties of the posterior, we make a direct comparison of the significances obtained in Bayesian and frequentist frameworks. We find that the wellknown look-elsewhere effect reduces local significances by about 1σ. We furthermore find that significances from our Bayesian framework are typically about 1 -2σ smaller than the global significances, though the reduction depends on the prior, global significance and integrated luminosity. This suggests that even global significances could significantly overstate the evidence against the background only model. We checked that this effect -the Bayes effect -was robust with respect to fourteen choices of prior and investigated the Jeffreys-Lindley paradox for three of them. 2 Ref.[23] reaches a similar conclusion in an extremely crude analysis of the Higgs discovery.

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“…Moreover, there might be a sharp peak at ∼ 1.4 TeV. Although the significance of the current data is relatively low [30], this structure, if confirmed, should imply the existence of nearby quasi-monoenergetic electron sources [31].…”

Section: Introductionmentioning

confidence: 95%

Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario

Liu

Kang

Yuan

et al. 2020

J. Cosmol. Astropart. Phys.

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The precise measurements of energy spectra of cosmic ray positrons and/or electrons by recent experiments show clear excesses above 10 GeV. Moreover, a potential sharp spectral feature was suggested by the Dark Matter Particle Explorer (DAMPE) data. These results inspire quite a number of discussions on the connection with either the annihilation/decay of dark matter (DM) or the astrophysical origins. Here we discuss a dark matter (DM) scenario in which DM particles could annihilate and decay into standard model particle pairs simultaneously. In this model, the peak structure is due to the DM annihilation in a nearby subhalo and the broad positron/electron excesses are due to the decay of DM in the Milky Way. This model can reasonably fit the DAMPE and AMS-02 data of the total e + e − spectra and the positron fraction, with model parameters being consistent with existing constraints. A simple realization of such a DM model is the spin-1 vector DM model.

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DAMPE squib? Significance of the 1.4 TeV DAMPE excess

Cited by 25 publications

References 35 publications

Indirect effects of dark matter

Indirect effects of dark matter

Bayesian and frequentist approaches to resonance searches

Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario

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