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It is shown that a Weakly Interacting Massive dark matter Particle (WIMP) interpretation for the positron excess observed in a variety of experiments, HEAT, PAMELA, and AMS-02, is highly constrained by the Fermi/LAT observations of dwarf…

Cosmology and Nongalactic Astrophysics · Physics 2016-04-06 Alejandro Lopez , Christopher Savage , Douglas Spolyar , Douglas Q. Adams

For explaining the AMS-02 cosmic positron excess, which was recently reported, we consider a scenario of thermally produced and decaying dark matter (DM) into the standard model (SM) leptons with an extremely small decay rate, \Gamma_{DM}…

High Energy Physics - Phenomenology · Physics 2014-05-02 Ki-Young Choi , Bumseok Kyae , Chang Sub Shin

Dark matter searches in gamma ray final states often make use of the fact that photons can be produced from final state muons. Modern Monte Carlo generators and DM codes include the effects of final state radiation from muons produced in…

High Energy Physics - Phenomenology · Physics 2016-06-22 Andre Scaffidi , Katherine Freese , Jinmian Li , Christopher Savage , Martin White , Anthony G. Williams

The AMS-02 experiment has reported a new measurement of the antiproton/proton ratio in Galactic cosmic rays (CRs). In the energy range $E\sim\,$60-450 GeV, this ratio is found to be remarkably constant. Using recent data on CR proton,…

High Energy Astrophysical Phenomena · Physics 2018-07-31 Jie Feng , Nicola Tomassetti , Alberto Oliva

The AMS-02 collaboration has just released its first result of the cosmic positron fraction $e^+/(e^-+e^+)$ with high precision up to $\sim 350$ GeV. The AMS-02 result shows the same trend with the previous PAMELA result, which requires…

High Energy Astrophysical Phenomena · Physics 2014-07-15 Qiang Yuan , Xiao-Jun Bi , Guo-Ming Chen , Yi-Qing Guo , Su-Jie Lin , Xinmin Zhang

Composite asymmetric dark matter (ADM) is the framework that naturally explains the coincidence of the baryon density and the dark matter density of the Universe. Through a portal interaction sharing particle-antiparticle asymmetries in the…

High Energy Physics - Phenomenology · Physics 2025-08-07 Saikat Das , Ayuki Kamada , Takumi Kuwahara , Kohta Murase , Deheng Song

Recently the PAMELA experiment has released its updated anti-proton flux and anti-proton to proton flux ratio data up to energies of ~200GeV. With no clear excess of cosmic ray anti-protons at high energies, one can extend constraints on…

High Energy Astrophysical Phenomena · Physics 2011-09-28 Ilias Cholis

For the newly discovered $W$-boson mass anomaly, one of the simplest dark matter (DM) models that can account for the anomaly without violating other astrophysical/experimental constraints is the inert two Higgs doublet model, in which the…

High Energy Astrophysical Phenomena · Physics 2023-03-17 Cheng-Rui Zhu , Ming-Yang Cui , Zi-Qing Xia , Zhao-Huan Yu , Xiaoyuan Huang , Qiang Yuan , Yi-Zhong Fan

Astrophysical observations indicate that there is roughly five times more dark matter in the Universe than ordinary baryonic matter, with an even larger amount of the Universe's energy content due to dark energy. So far, the microscopic…

We explain the excess of the antiproton fraction recently reported by the AMS-02 experiment by considering collisions between cosmic-ray protons accelerated by a local supernova remnant (SNR) and the surrounding dense cloud. The same…

High Energy Astrophysical Phenomena · Physics 2016-06-21 Kazunori Kohri , Kunihito Ioka , Yutaka Fujita , Ryo Yamazaki

If the dark matter particle is a Majorana fermion, annihilations into two fermions and one gauge boson could have, for some choices of the parameters of the model, a non-negligible cross-section. Using a toy model of leptophilic dark…

High Energy Physics - Phenomenology · Physics 2015-05-28 Mathias Garny , Alejandro Ibarra , Stefan Vogl

A new generation of upcoming space-based experiments will soon start to probe the spectrum of cosmic ray antiparticles with an unprecedented accuracy and, in particular, will open up a window to energies much higher than those accessible so…

Astrophysics · Physics 2008-11-26 Torsten Bringmann , Pierre Salati

The interpretation of data from indirect detection experiments searching for dark matter annihilations requires computationally expensive simulations of cosmic-ray propagation. In this work we present a new method based on Recurrent Neural…

High Energy Astrophysical Phenomena · Physics 2021-12-21 Felix Kahlhoefer , Michael Korsmeier , Michael Krämer , Silvia Manconi , Kathrin Nippel

The AMS-02 experiment has ushered cosmic-ray physics into precision era. In a companion paper, we designed an improved method to calibrate propagation models on B/C data. Here we provide a robust prediction of the $\bar{p}$ flux, accounting…

High Energy Astrophysical Phenomena · Physics 2020-04-13 Mathieu Boudaud , Yoann Génolini , Laurent Derome , Julien Lavalle , David Maurin , Pierre Salati , Pasquale D. Serpico

The Cryogenic Dark Matter Search (CDMS-II) employs low-temperature Ge and Si detectors to seek Weakly Interacting Massive Particles (WIMPs) via their elastic scattering interactions with nuclei. Simultaneous measurements of both ionization…

Astrophysics · Physics 2012-08-27 CDMS Collaboration

The cosmic-ray (CR) $e^\pm$ excess observed by AMS-02 can be explained by dark matter (DM) annihilation. However, the DM explanation requires a large annihilation cross section which is strongly disfavored by other observations, such as the…

High Energy Astrophysical Phenomena · Physics 2017-10-11 Qian-Fei Xiang , Xiao-Jun Bi , Su-Jie Lin , Peng-Fei Yin

We use our numerical code, DRAGON, to study the implications of recent data on our knowledge of the propagation properties of cosmic ray nuclei in the Galaxy. We show that B/C (as well as N/O and C/O) data, including those recently taken by…

High Energy Astrophysical Phenomena · Physics 2014-11-20 Giuseppe Di Bernardo , Carmelo Evoli , Daniele Gaggero , Dario Grasso , Luca Maccione

We consider indirect detection of meta-stable dark matter particles decaying into a stable neutral particle and a pair of standard model fermions. Due to the softer energy spectra from the three-body decay, such models could potentially…

High Energy Physics - Phenomenology · Physics 2017-03-23 Hsin-Chia Cheng , Wei-Chih Huang , Xiaoyuan Huang , Ian Low , Yue-Lin Sming Tsai , Qiang Yuan

The present work derived the robust constraints on annihilating WIMP parameters utilizing new radio observations of M31, as well as new studies of its DM distribution and other properties. The characteristics of emission due to DM…

High Energy Physics - Phenomenology · Physics 2023-02-21 Andrei E. Egorov
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