Antiproton ≈ Antiproton
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Antiproton Flux, Antiproton-to-Proton Flux Ratio, and Properties of Elementary Particle Fluxes in Primary Cosmic Rays Measured with the Alpha Magnetic Spectrometer on the International Space Station Open
A precision measurement by AMS of the antiproton flux and the antiproton-to-proton flux ratio in primary cosmic rays in the absolute rigidity range from 1 to 450 GV is presented based on 3.49×10^{5} antiproton events and 2.42×10^{9} proton…
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The Alpha Magnetic Spectrometer (AMS) on the international space station: Part II — Results from the first seven years Open
The Alpha Magnetic Spectrometer (AMS) is a precision particle physics detector on the International Space Station (ISS) conducting a unique, long-duration mission of fundamental physics research in space. The physics objectives include the…
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Novel Dark Matter Constraints from Antiprotons in Light of AMS-02 Open
We evaluate dark matter (DM) limits from cosmic-ray antiproton observations using the recent precise AMS-02 measurements. We properly take into account cosmic-ray propagation uncertainties, fitting DM and propagation parameters at the same…
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Possible Dark Matter Annihilation Signal in the AMS-02 Antiproton Data Open
Using the latest AMS-02 cosmic-ray antiproton flux data, we search for a potential dark matter annihilation signal. The background parameters about the propagation, source injection, and solar modulation are not assumed a priori but based …
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A robust excess in the cosmic-ray antiproton spectrum: Implications for annihilating dark matter Open
An excess of $~ 10–20 GeV$ cosmic-ray antiprotons has been identified in the spectrum reported by the AMS-02 Collaboration. The systematic uncertainties associated with this signal, however, have made it difficult to interpret these result…
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Solution of Heliospheric Propagation: Unveiling the Local Interstellar Spectra of Cosmic-ray Species Open
Local interstellar spectra (LIS) for protons, helium, and antiprotons are built using the most recent experimental results combined with state-of-the-art models for propagation in the Galaxy and heliosphere. Two propagation packages, GALPR…
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A precision search for WIMPs with charged cosmic rays Open
AMS-02 has reached the sensitivity to probe canonical thermal WIMPs by their annihilation into antiprotons. Due to the high precision of the data, uncertainties in the astrophysical background have become the most limiting factor for indir…
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Cumulants and correlation functions of net-proton, proton, and antiproton multiplicity distributions in collisions at energies available at the BNL Relativistic Heavy Ion Collider Open
Here, we report a systematic measurement of cumulants, Cn, for net-proton, proton, and antiproton multiplicity distributions, and correlation functions, κn, for proton and antiproton multiplicity distributions up to the fourth order in Au+…
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Propagation of cosmic rays in the AMS-02 era Open
In this work we use the newly reported Boron-to-Carbon ratio (B/C) from\nAMS-02 and the time-dependent proton fluxes from PAMELA and AMS-02 to constrain\nthe source and propagation parameters of cosmic rays in the Milky Way. A linear\ncorr…
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Lorentz-violating spinor electrodynamics and Penning traps Open
The prospects are explored for testing Lorentz- and CPT-violating quantum electrodynamics in experiments with Penning traps. We present the Lagrange density of Lorentz-violating spinor electrodynamics with operators of mass dimensions up t…
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Scrutinizing the evidence for dark matter in cosmic-ray antiprotons Open
Global fits of primary and secondary cosmic-ray (CR) fluxes measured by\nAMS-02 have great potential to study CR propagation models and search for\nexotic sources of antimatter such as annihilating dark matter (DM). Previous\nstudies of AM…
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Bayesian analysis of spatial-dependent cosmic-ray propagation: Astrophysical background of antiprotons and positrons Open
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, heli…
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Prospects to verify a possible dark matter hint in cosmic antiprotons with antideuterons and antihelium Open
Cosmic rays are an important tool to study dark matter annihilation in our\nGalaxy. Recently, a possible hint for dark matter annihilation was found in the\nantiproton spectrum measured by AMS-02, even though the result might be\naffected …
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Cosmic ray antiprotons at high energies Open
Cosmic ray antiprotons provide a powerful tool to probe dark matter\nannihilations in our galaxy. The sensitivity of this important channel is,\nhowever, diluted by sizable uncertainties in the secondary antiproton\nbackground. In this wor…
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Constraining heavy dark matter with cosmic-ray antiprotons Open
Cosmic-ray observations provide a powerful probe of dark matter annihilation in the Galaxy. In this paper we derive constraints on heavy dark matter from the recent precise AMS-02 antiproton data. We consider all possible annihilation chan…
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Cosmic-ray Antinuclei as Messengers of New Physics: Status and Outlook for the New Decade Open
The precise measurement of cosmic-ray antinuclei serves as an important means for identifying the nature of dark matter and other new astrophysical phenomena, and could be used with other cosmic-ray species to understand cosmic-ray product…
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Production cross sections of cosmic antiprotons in the light of new data from the NA61 and LHCb experiments Open
The cosmic-ray flux of antiprotons is measured with high precision by the space-borne particle spectrometers AMS-02. Its interpretation requires a correct description of the dominant production process for antiprotons in our Galaxy, namely…
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Galactic cosmic-ray propagation in the light of AMS-02: Analysis of protons, helium, and antiprotons Open
We present novel constraints on cosmic-ray propagation in the Galaxy using\nthe recent precise measurements of proton and helium spectra from AMS-02,\ntogether with preliminary AMS-02 data on the antiproton over proton ratio. To\nexplore e…
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Constraints on the Coupling between Axionlike Dark Matter and Photons Using an Antiproton Superconducting Tuned Detection Circuit in a Cryogenic Penning Trap Open
We constrain the coupling between axionlike particles (ALPs) and photons, measured with the superconducting resonant detection circuit of a cryogenic Penning trap. By searching the noise spectrum of our fixed-frequency resonant circuit for…
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Probing dark matter annihilation in the Galaxy with antiprotons and gamma rays Open
A possible hint of dark matter annihilation has been found in Cuoco, Korsmeier and Krämer (2017) from an analysis of recent cosmic-ray antiproton data from AMS-02 and taking into account cosmic-ray propagation uncertainties by fitting at t…
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Plasma and trap-based techniques for science with antimatter Open
Positrons (i.e., antielectrons) find use in a wide variety of applications, and antiprotons are required for the formation and study of antihydrogen. Available sources of these antiparticles are relatively weak. To optimize their use, most…
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Interpretation of the cosmic ray positron and antiproton fluxes Open
The spectral shape of cosmic ray positrons and antiprotons has been\naccurately measured in the broad kinetic energy range 1-350 GeV. In the higher\npart of this range (E > 30 GeV) the e+ and pbar are both well described by\npower laws wit…
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Asymmetric matter from a dark first-order phase transition Open
We introduce a model for matters-genesis in which both the baryonic and dark matter asymmetries originate from a first-order phase transition in a dark sector with an $SU(3) \times SU(2) \times U(1)$ gauge group and minimal matter content.…
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Prospects for comparison of matter and antimatter gravitation with ALPHA-g Open
The ALPHA experiment has recently entered an expansion phase of its experimental programme, driven in part by the expected benefits of conducting experiments in the framework of the new AD + ELENA antiproton facility at CERN. With antihydr…
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Improved limit on the directly measured antiproton lifetime Open
Continuous monitoring of a cloud of antiprotons stored in a Penning trap for 405 days enables us to set an improved limit on the directly measured antiproton lifetime. From our measurements we extract a storage time of 3.15x108 equivalent …
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Excesses of cosmic ray spectra from a single nearby source Open
Growing evidence reveals universal hardening on various cosmic ray spectra,\ne.g. proton, positron, as well as antiproton fraction. Such universality may\nindicate they have a common origin. In this paper, we argue that these\nwidespread e…
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Constraints on Exotic Spin-Dependent Interactions Between Matter and Antimatter from Antiprotonic Helium Spectroscopy Open
Heretofore undiscovered spin-0 or spin-1 bosons can mediate exotic spin-dependent interactions between standard model particles. Here, we carry out the first search for semileptonic spin-dependent interactions between matter and antimatter…
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SPECTRAL INTENSITIES OF ANTIPROTONS AND THE NESTED LEAKY-BOX MODEL FOR COSMIC RAYS IN THE GALAXY Open
In this paper we note that the spectral intensities of antiprotons observed in Galactic cosmic rays in the energy range ∼1–300 GeV by BESS, PAMELA, and AMS instruments display nearly the same spectral shape as that generated by primary cos…
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Event simulation based on three-fluid hydrodynamics for collisions at energies available at the Dubna Nuclotron-based Ion Collider Facility and at the Facility for Antiproton and Ion Research in Darmstadt Open
We present a new event generator based on the three-fluid hydrodynamics\napproach for the early stage of the collision, followed by a particlization at\nthe hydrodynamic decoupling surface to join to a microscopic transport model,\nUrQMD, …
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Cross section for Rydberg antihydrogen production via charge exchange between Rydberg positroniums and antiprotons in a magnetic field Open
The antihydrogen formation by charge exchange between cold antiprotons and\nRydberg positronium Ps is studied by using the Classical Trajectory Monte Carlo\n(CTMC) method.\n