High-energy electron observations by PPB-BETS flight in Antarctica

Torii, S.; Yamagami, T.; Tamura, T.; Yoshida, K.; Kitamura, H.; Anraku, K.; Chang, J.; Ejiri, M.; Iijima, I.; Kadokura, A.; Kasahara, K.; Katayose, Y.; Kobayashi, T.; Komori, Y.; Matsuzaka, Y.; Mizutani, K.; Murakami, H.; Namiki, M.; Nishimura, J.; Ohta, S.; Saito, Y.; Shibata, M.; Tateyama, N.; Yamagishi, H.; Yamashita, T.; Yuda, T.

doi:10.48550/arxiv.0809.0760

Cited by 160 publications

(270 citation statements)

References 18 publications

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“…There is also new data from ATIC where one observes excess in e + + e − spectrum with a peak around 600 GeV [3]. PPB-BETS [4], also reports excess in the e + + e − energy spectrum between 500-800 GeV. While there could be astrophysical explanations for these anomalies [5], it is also possible that these are among the first signals of dark matter annihilation.…”

Section: Introductionmentioning

confidence: 99%

Mirage in the sky: Nonthermal dark matter, gravitino problem, and cosmic ray anomalies

2009

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Recent anomalies in cosmic rays could be due to dark matter annihilation in our galaxy. In order to get the required large cross-section to explain the data while still obtaining the right relic density, we rely on a non standard thermal history between dark matter freeze-out and Big-Bang Nucleosynthesis (BBN). We show that through a reheating phase from the decay of a heavy moduli or even the gravitino, we can produce the right relic density of dark matter if its self-annihilation crosssection is large enough. In addition to fitting the recent data, this scenario solves the cosmological moduli and gravitino problems. We illustrate this mechanism with a specific example in the context of U (1)B−L extended MSSM where supersymmetry is broken via mirage mediation. These string motivated models naturally contain heavy moduli decaying to the gravitino, whose subsequent decay to the LSP can reheat the universe at a low temperature. The right-handed sneutrino and the B − L gaugino can both be viable dark matter candidates with large cross-section. They are leptophilic because of B − L charges. We also show that it is possible to distinguish the non-thermal from the thermal scenario (using Sommerfeld enhancement) in direct detection experiments for certain regions of parameter space.

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Section: Introductionmentioning

confidence: 99%

Mirage in the sky: Nonthermal dark matter, gravitino problem, and cosmic ray anomalies

2009

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“…The dark matter asymmetry and the baryon asymmetry may originate from decays of the same heavy particles, so that their coincidence is not surprising at all. On the other hand, recently cosmic-ray data [5,6,7,8,9] suggest [10] that (i) the dark matter should dominantly annihilate or decay into leptons with a large cross section or a long life time; (ii) the dark matter annihilation or decay should be consistent with the constraints from the observations on the gamma and neutrino fluxes. In this paper we explain these phenomena in a unified scenario where the neutrino masses originate through the Dirac seesaw mechanism [11].…”

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confidence: 87%

“…The recent cosmic-ray experiments [5,6,7,8,9] suggest [10] that (i) the TeV-scale dark matter should mostly annihilate or decay into the leptons with a large cross section or a long life time; (ii) the dark matter annihilation or decay should not result in overabundant gamma and neutrino fluxes. For demonstration, we take the rotation,…”

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confidence: 99%

Visible and dark matter genesis and cosmic positron and electron excesses

Sarkar

Zhang

2009

Phys. Rev. D

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Dark and baryonic matter contribute comparable energy density to the present Universe. The dark matter may also be responsible for the cosmic positron/electron excesses. We connect these phenomena with Dirac seesaw for neutrino masses. In our model (i) the dark matter relic density is a dark matter asymmetry generated simultaneously with the baryon asymmetry so that we can naturally understand the coincidence between the dark and baryonic matter; (ii) the dark matter mostly decays into the leptons so that its decay can interpret the anomalous cosmic rays with positron/electron excesses. PACS numbers: 98.80.Cq, 95.35.+d, 14.60.Pq, 11.30.Fs Precise cosmological observations indicate that dark and baryonic matter have different properties but contribute comparable energy density to the present Universe. This intriguing coincidence inspires us to propose a common origin for the creation and evolution of the dark and baryonic matter. Since the baryonic matter currently exists because of a matter-antimatter asymmetry, the dark matter relic density may also be an asymmetry between the dark matter and dark antimatter [1,2,3,4]. The dark matter asymmetry and the baryon asymmetry may originate from decays of the same heavy particles, so that their coincidence is not surprising at all. On the other hand, recently cosmic-ray data [5,6,7,8,9] suggest [10] that (i) the dark matter should dominantly annihilate or decay into leptons with a large cross section or a long life time; (ii) the dark matter annihilation or decay should be consistent with the constraints from the observations on the gamma and neutrino fluxes. In this paper we explain these phenomena in a unified scenario where the neutrino masses originate through the Dirac seesaw mechanism [11].We extend the standard model (SM) with a global U (1) lepton × U (1) dark symmetry and include additional particles: singlet right-handed neutrino ν R (1, 1, 0)(1, 1), heavy doublet scalar η(1, 2, −1/2)(0, −1), charged singlet scalar ξ(1, 1, 1)(−2, 0), and neutral singlet scalars σ(1, 1, 0)(0, −1) and χ(1, 1, 0)(−2, −1), where the transformations are given under the SM gauge group SU (3) c × SU (2) L × U (1) Y and the global symmetry U (1) lepton × U (1) dark . For simplicity, we only present the relevant part of the Lagrangian for purpose of demonstration,Here ψ L (1, 2, −1/2)(1, 0) and φ(1, 2, −1/2)(0, 0), respectively, are the SM lepton and Higgs doublets. The righthanded neutrinos neither have Yukawa couplings with the SM Higgs doublet nor have Majorana masses as a result of the U (1) lepton ×U (1) dark conservation. The global symmetry U (1) lepton will be exactly conserved at any energy scales while the global symmetry U (1) dark will be spontaneously broken above the weak scale. The singlet scalar σ acquires a vacuum expectation value (VEV) to break U (1) dark and then induces a small VEV of the heavy doublet scalars η after the electroweak symmetry breaking by φ ≃ 174 GeV,Therefore through the Dirac seesaw mechanism [11], the neutrinos obtain very small Dirac masses n...

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“…Recently, there has been great excitement that new information about DM may be revealed by the results from the PAMELA satellite [2] claiming an increase in positron fraction in cosmic rays with energies above 10 GeV. Others, including the PPB-BETS [3] and HESS [4] experiments, also claim enhancements in electron/positron flux for energies above 100 GeV. More recently, the FERMI collaboration released a measurement of the e + e − flux in the 20 GeV to 1 TeV range [5].…”

Section: Introductionmentioning

confidence: 99%

Sneutrino dark matter: Symmetry protection and cosmic ray anomalies

et al. 2010

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We present an R-parity conserving model of sneutrino dark matter within a Higgsphilic Uð1Þ 0 extension of the minimal supersymmetric standard model. In this theory, the parameter and light Dirac neutrino masses are generated naturally upon the breaking of the Uð1Þ 0 gauge symmetry. One of the right-handed sneutrinos is the lightest supersymmetric particle. The leptonic and hadronic decays of another sneutrino, taken to be the next-to-lightest superpartner, allow for a natural fit to the recent results reported by the PAMELA experiment. We perform a detailed calculation of the dark matter relic density in this scenario, and show that the model is consistent with the ATIC and Fermi LAT experiments.

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High-energy electron observations by PPB-BETS flight in Antarctica

Cited by 160 publications

References 18 publications

Mirage in the sky: Nonthermal dark matter, gravitino problem, and cosmic ray anomalies

Mirage in the sky: Nonthermal dark matter, gravitino problem, and cosmic ray anomalies

Visible and dark matter genesis and cosmic positron and electron excesses

Sneutrino dark matter: Symmetry protection and cosmic ray anomalies

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