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Open AccessJournal ArticleDOI

Cosmic-Ray Positron Energy Spectrum Measured by PAMELA

TLDR
The satellite-borne experiment PAMELA has been used to make a new measurement of the cosmic-ray positron flux and fraction that extends previously published measurements up to 300 GeV in kinetic energy.
Abstract
Precision measurements of the positron component in the cosmic radiation provide important information about the propagation of cosmic rays and the nature of particle sources in our Galaxy. The satellite-borne experiment PAMELA has been used to make a new measurement of the cosmic-ray positron flux and fraction that extends previously published measurements up to 300 GeV in kinetic energy. The combined measurements of the cosmic-ray positron energy spectrum and fraction provide a unique tool to constrain interpretation models. During the recent solar minimum activity period from July 2006 to December 2009, approximately 24 500 positrons were observed. The results cannot be easily reconciled with purely secondary production, and additional sources of either astrophysical or exotic origin may be required.

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Posted Content

Searches for light exotics at LHCb

TL;DR: In this article, the authors report on the latest direct searches for light exotics at LHCb, conducted during Run I of LHC, which are divided into two sections, the first part will cover the search for the lepton number violating decay, while the second part is devoted to searching for a low mass dark boson in the decay.
Posted Content

Dark Atoms and their decaying constituents

TL;DR: In this article, it was shown that decays of a doubly charged technilepton can explain the observed high energy positron excess in the cosmic rays if the fraction of the decayed leptonic leptons is larger than 10−6% of the total dark matter density.
Posted Content

A model-independent analysis of leptophilic dark matter at future electron-positron colliders in the mono-photon and mono-Z channels

TL;DR: In this article, the authors consider the possibility that dark matter (DM) only interacts with the Standard Model leptons, but not quarks at tree-level, and analyze the future lepton collider prospects of such leptophilic DM in the mono-photon and mono-$Z$ (both leptonic and hadronic) channels.
Journal ArticleDOI

Cosmic ray direct measurements

TL;DR: A review of the major results up to an energy of few TeV obtained by the previous and the current experiments is presented in this article, where the main goals have been the search for primordial antimatter, dark matter annihilation signals and exotic particles and the study of the mechanisms of production, acceleration and propagation of cosmic rays.
Journal ArticleDOI

Constraining time dependent dark matter signals from the Sun

TL;DR: In this paper , the authors analyzed the time dependence of dark matter cosmic-ray signals in three space-based experiments: AMS-02, DAMPE and CALET, and derived the 95% C.L. exclusion limits on the signal strength from the current data.
References
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Journal ArticleDOI

Random Forests

TL;DR: Internal estimates monitor error, strength, and correlation and these are used to show the response to increasing the number of features used in the forest, and are also applicable to regression.
Journal ArticleDOI

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S. Agostinelli, +126 more
TL;DR: The Gelfant 4 toolkit as discussed by the authors is a toolkit for simulating the passage of particles through matter, including a complete range of functionality including tracking, geometry, physics models and hits.
Journal ArticleDOI

Machine learning

TL;DR: Machine learning addresses many of the same research questions as the fields of statistics, data mining, and psychology, but with differences of emphasis.
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