A simple and natural interpretations of the DAMPE cosmic-ray electron/positron spectrum within two sigma deviations

Abstract

The DArk Matter Particle Explorer (DAMPE) experiment has recently announced the first results for the measurement of total electron plus positron fluxes between 25 GeV and 4.6 TeV. A spectral break at about 0.9 TeV and a tentative peak excess around 1.4 TeV have been found. However, it is very difficult to reproduce both the peak signal and the smooth background including spectral break simultaneously. We point out that the numbers of events in the two energy ranges (bins) close to the 1.4 TeV excess have $1\sigma$ deficits. With the basic physics principles such as simplicity and naturalness, we consider the $-2\sigma$, $+2\sigma$, and $-1\sigma$ deviations due to statistical fluctuations for the 1229.3~GeV bin, 1411.4~GeV bin, and 1620.5~GeV bin. Interestingly, we show that all the DAMPE data can be explained consistently via both the continuous distributed pulsar and dark matter interpretations, which have ${\chi }^2\simeq 17.2$ and ${\chi }^2\simeq 13.9$ (for all the 38 points in DAMPE electron/positron spectrum with 3 of them revised), respectively. These results are different from the previous analyses by neglecting the 1.4 TeV excess. At the same time, we do a similar global fitting on the newly released CALET lepton data, which could also be interpreted by such configurations. Moreover, we present a $U(1{)}_D$ dark matter model with Breit-Wigner mechanism, which can provide the proper dark matter annihilation cross section and escape the CMB constraint. Furthermore, we suggest a few ways to test our proposal.

arXiv comment18 pages, 6 figures, 5 tables. Figures and Bibs updated

References in corpus (42)

• Particle Dark Matter: Evidence, Candidates and Constraints
• Supersymmetric Dark Matter
• Observation of an anomalous positron abundance in the cosmic radiation
• The Inner Structure of LambdaCDM Halos III: Universality and Asymptotic Slopes
• Measurement of the Cosmic Ray e+ plus e- spectrum from 20 GeV to 1 TeV with the Fermi Large Area Telescope
• Non-Baryonic Dark Matter - Observational Evidence and Detection Methods
• PAMELA Measurements of Cosmic-ray Proton and Helium Spectra
• The Diversity and Similarity of Simulated Cold Dark Matter Halos
• The energy spectrum of cosmic-ray electrons at TeV energies
• Empirical models for Dark Matter Halos. I. Nonparametric Construction of Density Profiles and Comparison with Parametric Models
• Measurement of separate cosmic-ray electron and positron spectra with the Fermi Large Area Telescope
• Constraining Dark Matter Models from a Combined Analysis of Milky Way Satellites with the Fermi Large Area Telescope
• Direct detection of a break in the teraelectronvolt cosmic-ray spectrum of electrons and positrons
• Probing the ATIC peak in the cosmic-ray electron spectrum with H.E.S.S
• A novel determination of the local dark matter density
• Measurements of the Cosmic-Ray Positron Fraction From 1 to 50 GeV
• The dark matter density at the Sun's location
• Discrepant hardening observed in cosmic-ray elemental spectra
• Cosmic-Ray Nuclei, Antiprotons and Gamma-rays in the Galaxy: a New Diffusion Model
• Cosmic-ray positron fraction measurement from 1 to 30 GeV with AMS-01
• Determination of the Local Dark Matter Density in our Galaxy
• Cosmic-ray electron+positron spectrum from 7 GeV to 2 TeV with the Fermi Large Area Telescope
• Galactic secondary positron flux at the Earth
• Dark Matter distribution in the Milky Way: microlensing and dynamical constraints
• CRDB: a database of charged cosmic rays
• Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station
• Bayesian analysis of cosmic-ray propagation: evidence against homogeneous diffusion
• Dark matter interpretation of recent electron and positron data
• Energy Spectrum of Cosmic-ray Electron and Positron from 10 GeV to 3 TeV Observed with the Calorimetric Electron Telescope on the International Space Station
• Dissecting cosmic-ray electron-positron data with Occam's Razor: the role of known Pulsars
• Nuclear enhancement factor in calculation of Galactic diffuse gamma-rays: A new estimate with DPMJET-3
• Systematic uncertainties in the determination of the local dark matter density
• Signatures of a two million year old supernova in the spectra of cosmic ray protons, antiprotons and positrons
• A new evaluation of the antiproton production cross section for cosmic ray studies
• Quantitative study of the AMS-02 electron/positron spectra: implications for the pulsar and dark matter properties
• The Cosmic Ray Antiproton Background for AMS-02
• Cosmic ray signatures of a 2-3 Myr old local supernova
• Parameterization of the antiproton inclusive production cross section on nuclei
• Studies on cosmic ray nuclei with Voyager, ACE and AMS-02: I. local interstellar spectra and solar modulation
• Galactic cosmic-ray model in the light of AMS-02 nuclei data
• Bayesian analysis of the break in DAMPE lepton spectra
• Latest Results from VERITAS: Gamma 2016

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• Two-mediator dark matter models and cosmic electron excess
• Some new hints on cosmic-ray propagation from AMS-02 nuclei spectra
• Interpretation of the cosmic ray positron and electron excesses with an annihilating-decaying dark matter scenario
• Origin of hardening in spectra of cosmic ray nuclei at a few hundred GeV using AMS-02 data
• Multicomponent Dark Matter in the Light of CALET and DAMPE