Bayesian analysis of the break in 
<i>DAMPE</i>
 lepton spectra

Niu, Jia-Shu; Li, Tianjun; Ding, Ran; Zhu, B.; Xue, Hui-Fang; Wang, Yan

doi:10.1103/physrevd.97.083012

Cited by 22 publications

(21 citation statements)

References 150 publications

(206 reference statements)

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“…In such a case the DC2 model actually returns to the plain diffusion model. The parameter v A in the DR2 model is fitted to be about 29.4 km s −1 , which is smaller than that inferred in the traditional diffusion reacceleration model configuration (i.e., η = 1; hereafter DR) [4,5,10,11]. This is due to the β η term in the diffusion coefficient compensates to some degree the reacceleration effect required to reproduce the bump of the B/C ratio (see below).…”

Section: A Propagation Parametersmentioning

confidence: 82%

“…[10] gives z h = 5.0 ± 0.9 kpc, which is consistent with this work. The fits with the DR model configuration using different data sets gave 5.4 ± 1.4 kpc [4], 3.3±0.6 [5], 5.9±1.1 [10], and 7.4±0.6 [11]. The value of δ is found to be about 0.5 (0.4) for the DC2 (DR2) model at high rigidities.…”

Section: A Propagation Parametersmentioning

confidence: 99%

“…The secondary-to-primary nucleus ratio, such as the Boronto-Carbon ratio (B/C), is usually used to infer/constrain the propagation models and parameters (e.g., [1][2][3][4][5][6][7][8]. With the new measurement of the B/C ratio by e.g., the Alpha Magnetic Spectrometer (AMS-02) [9], significantly improved constraints on the model parameters can be obtained [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

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Implications on cosmic ray injection and propagation parameters from Voyager/ACE/AMS-02 nucleus data

Yuan

2018

Sci. China Phys. Mech. Astron.

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We study the propagation and injection models of cosmic rays using the latest measurements of the Boronto-Carbon ratio and fluxes of protons, Helium, Carbon, and Oxygen nuclei by the Alpha Magnetic Spectrometer and the Advanced Composition Explorer at top of the Earth, and the Voyager spacecraft outside the heliosphere. The ACE data during the same time interval of the AMS-02 data are extracted to minimize the complexity of the solar modulation effect. We find that the cosmic ray nucleus data favor a modified version of the diffusionreacceleration scenario of the propagation. The diffusion coefficient is, however, required to increase moderately with decreasing rigidity at low energies, which has interesting implications on the particle and plasma interaction in the Milky Way. We further find that the low rigidity (< a few GV) injection spectra are different for different compositions. The injection spectra are softer for lighter nuclei. These results are expected to be helpful in understanding the acceleration process of cosmic rays. PACS numbers: 95.85.Ry,98.38.j,94.20.wc

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Section: A Propagation Parametersmentioning

confidence: 82%

Section: A Propagation Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Implications on cosmic ray injection and propagation parameters from Voyager/ACE/AMS-02 nucleus data

Yuan

2018

Sci. China Phys. Mech. Astron.

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“…Although such an excess may originate from certain new unobserved astrophysical sources, it may also be explained by DM annihilation [3]. Relevant discussion on this subject can be found in [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], and one notable conclusion is that if one assumes the e + e − cosmic-ray spectrum to be generated directly from DM annihilation in a nearby clump halo, the best fit values for the DM particle mass, the DM clump mass and the annihilation luminosity are around 1.5 TeV, 10 6−8 M and 10 64−66 GeV 2 cm −3 , respectively, if the subhalo is about 0.1 ∼ 0.3 kpc away from the earth [3].…”

Section: Introductionmentioning

confidence: 99%

Explaining the DAMPE data with scalar dark matter and gauged $$U(1)_{L_e-L_\mu }$$ U ( 1 ) L e

Cao¹,

Liu²,

Guo³

et al. 2018

Eur. Phys. J. C

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Inspired by the peak structure observed by recent DAMPE experiment in e + e − cosmic-ray spectrum, we consider a scalar dark matter (DM) model with gauged U (1) L e −L μ symmetry, which is the most economical anomaly-free theory to potentially explain the peak by DM annihilation in nearby subhalo. We utilize the process χχ → Z Z → lll l , where χ , Z , l ( ) denote the scalar DM, the new gauge boson and l ( ) = e, μ, respectively, to generate the e + e − spectrum. By fitting the predicted spectrum to the experimental data, we obtain the favored DM mass range m χ 3060 +80−100 GeV and m ≡ m χ − m Z 14 GeV at 68% Confidence Level (C.L.). Furthermore, we determine the parameter space of the model which can explain the peak and meanwhile satisfy the constraints from DM relic abundance, DM direct detection and the collider bounds. We conclude that the model we consider can account for the peak, although there exists a tension with the constraints from the LEP-II bound on m Z arising from the cross section measurement of e + e − → Z * → e + e − .

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“…A detailed modeling of the GCR acceleration and propagation is difficult, due to the tanglement of the above mentioned effects and in general only the data around the Earth are available. The traditional way is to model each of those effects, and fit globally to the data (Putze et al 2009(Putze et al , 2010Trotta et al 2011;Jin et al 2015;Jóhannesson et al 2016;Korsmeier & Cuoco 2016;Feng et al 2016;Yuan et al 2017;Niu & Li 2018). It is found that there is large degeneracy among different models and the corresponding parameters (Yuan et al 2017;Niu & Li 2018).…”

Section: Introductionmentioning

confidence: 99%

Studies on Cosmic-Ray Nuclei with Voyager, ACE, and AMS-02. I. Local Interstellar Spectra and Solar Modulation

Zhu

Yuan

Wei

2018

ApJ

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The acceleration of cosmic ray particles and their propagation in the Milky Way and the heliosphere tangle with each other, leading to complexity and degeneracy of the modeling of Galactic cosmic rays (GCRs). The recent measurements of the GCR spectra by Voyager-1 from outside of the heliosphere gave a first direct observation of GCRs in the local interstellar (LIS) environment. Together with the high-precision data near the Earth taken by ACE and AMS-02, we derive the LIS spectra of Helium, Lithium, Beryllium, Boron, Carbon, and Oxygen nuclei from a few MeV/n to TeV/n, using a non-parameterization method. These LIS spectra are helpful in further studying the injection and propagation parameters of GCRs. The nearly 20 years of data recorded by ACE are used to determine the solar modulation parameters over the solar cycles 23 and 24, based on the force-field approximation. We find general agreements of the modulation potential with the results inferred from neutron monitors and other cosmic ray data.

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Bayesian analysis of the break in DAMPE lepton spectra

Cited by 22 publications

References 150 publications

Implications on cosmic ray injection and propagation parameters from Voyager/ACE/AMS-02 nucleus data

Implications on cosmic ray injection and propagation parameters from Voyager/ACE/AMS-02 nucleus data

Explaining the DAMPE data with scalar dark matter and gauged $$U(1)_{L_e-L_\mu }$$ U ( 1 ) L e

Studies on Cosmic-Ray Nuclei with Voyager, ACE, and AMS-02. I. Local Interstellar Spectra and Solar Modulation

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