For better comprehensibility of CALET sensitivity study an appendix is added in this version which contains the results of the numerical calculations (section 2 before) and comparison of parametrization and numerical calculation (section 5.3 before). Secondary gamma-ray flux from the interaction of DM decay products and ISRF are calculated and results are shown in figure 3 for 1 TeV DM
基于ISS的CALET（CALorimetric Electron Telescope）探测器可以在间接寻找暗物质（DM）中发挥重要作用，首次直接测量TeV区域的电子+正电子通量。它具有近似$2\%$的能量分辨率和良好的质子排斥比（$1:10^5$），具有在宇宙线（CR）电子谱中寻找精细结构的潜力。在这种情况下，我们讨论的能力CALET辨别来自天体物理源和DM衰变或湮灭之间的信号。我们适合的参数化的本地星际电子和正电子光谱到目前的测量，无论是脉冲星或3体衰变的费米子DM作为额外的源，导致正电子过剩。预计CALET数据的情况下，DM衰变解释过量的计算和分析。从这个特定的三体DM衰变，可以解释最近的测量从AMS $-02$实验的信号被证明是区别于一个单一的脉冲星源，导致正电子过剩的5年的观测与CALET，根据光谱的形状。我们还研究了银河系外弥漫$γ$ -射线数据的限制，这DM唯一的解释的正电子过剩，并表明，特别是对于可能剩余的参数空间中的CR电子光谱存在一个明确的可识别的签名。
英文摘要：
The ISS-based CALET (CALorimetric Electron Telescope) detector can play an important role in indirect search for Dark Matter (DM), measuring the electron+positron flux in the TeV region for the first time directly. With its fine energy resolution of approximately $2\%$ and good proton rejection ratio ($1:10^5$) it has the potential to search for fine structures in the Cosmic Ray (CR) electron spectrum. In this context we discuss the ability of CALET to discern between signals originating from astrophysical sources and DM decay or annihilation. We fit a parametrization of the local interstellar electron and positron spectra to current measurements, with either a pulsar or 3-body decay of fermionic DM as the extra source causing the positron excess. The expected CALET data for scenarios in which DM decay explains the excess are calculated and analyzed. The signal from this particular 3-body DM decay which can explain the recent measurements of from the AMS$-02$ experiment is shown to be distinguishable from a single pulsar source causing the positron excess by 5 years of observation with CALET, based on the shape of the spectrum. We also study the constraints from extra-galactic diffuse $γ$-ray data on this DM-only explanation of the positron excess and show that especially for the possibly remaining parameter space a clearly identifiable signature in the CR electron spectrum exists.
A combined interpretation of the CALET $e^+\, +\, e^-$ spectrum up to 3 TeV and the AMS-02 positron spectrum up to 500 GeV was performed and the results are discussed. To parametrize the background electron flux, we assume a smoothly broken power-law spectrum with an exponential cut-off for electrons and fit this parametrization to the measurements, with either a pulsar or 3-body decay of fermionic Dark Matter as the extra electron-positron pair source responsible for the positron excess. We found that depending on the parameters for the background, both Dark Matter decay and the pulsar model …
In the light of the latest measurements on the total $e^+ + e^-$ flux by CALET and DAMPE experiments, we revisit the multicomponent leptonically decaying dark matter (DM) explanations to the cosmic-ray electron/positron excesses observed previously. Especially, we use the single and double-component DM models to explore the compatibility of the AMS-02 positron fraction with the new CALET or DAMPE data. It turns out that neither single nor double-component DM models are able to fit the AMS-02 positron fraction and DAMPE total $e^+ + e^-$ flux data simultaneously. On the other hand, for the comb…
In the light of the recently observed XENON1T electronic recoil (ER) data, we investigate the possibility of constraining the parameter space of a generic fermionic warm dark matter (WDM), decaying into a standard model (SM) neutrino and a photon. The photon as a decay product, when produced inside the XENON1T chamber, interacts with an electron of a xenon (Xe) atom, leading to a contribution in the observed ER data. We add this dark matter (DM) induced signal over the standard background ($\rm B_0$) considered by the XENON1T collaboration and perform a $χ^2$ fit against the XENON1T data to ob…
Since the report of the PeV-TeV neutrinos by the IceCube Collaboration, various particle physics models have been proposed to explain the neutrino spectrum by dark matter particles decaying into neutrinos and other Standard Model particles.In such scenarios, simultaneous $γ$-ray emission is commonly expected. Therefore, multi-messenger connections are generally important for the indirect searches of dark matters. The recent development of $γ$-ray astronomy puts stringent constraints on the properties of dark matter, especially by observations with the Fermi $γ$-ray satellite in the last severa…
Revisiting the limits on dark matter annihilation cross-section and decay lifetime in light of electron and positron fluxes
Yokohama National University（横滨国立大学）；RIKEN Center for Interdisciplinary Theoretical and Mathematical Sciences(iTHEMS), RIKEN（理化学研究所交叉理论数学科学中心(iTHEMS)）；National Astronomical Observatory of Japan (NAOJ)（日本国立天文台）；SOKENDAI（综合研究大学院大学）；The University of Tokyo（东京大学）；KEK（高能加速器研究机构）；Kavli IPMU (WPI), UTIAS, The University of Tokyo（东京大学柏校区卡弗里宇宙物理学与数学国际研究中心）；Indian Institute of Technology Hyderabad（印度理工学院海得拉巴分校）
We consider the indirect detection of dark matter that is captured in the Sun and subsequently annihilates to long-lived dark mediators. If these mediators escape the Sun before decaying, they can produce striking gamma ray signals, either via the decay of the mediators directly to photons, or via bremsstrahlung and hadronization of the mediator decay products. Using recent measurements from the HAWC Observatory, we determine model-independent limits on heavy dark matter that are orders of magnitude more powerful than direct detection experiments, for both spin-dependent and spin-independent s…
We present a new open-source package, Hazma 2, that computes accurate spectra relevant for indirect dark matter searches for photon, neutrino, and positron production from vector-mediated dark matter annihilation and for spin-one dark matter decay. The tool bridges across the regimes of validity of two state of the art codes: Hazma 1, which provides an accurate description below hadronic resonances up to center-of-mass energies around 250 MeV, and HERWIG4DM, which is based on vector meson dominance and measured form factors, and accurate well into the few GeV range. The applicability of the co…
