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Title: Muon Bundles as a Sign of Strangelets from the Universe

Abstract

Recently, the CERN ALICE experiment observed muon bundles of very high multiplicities in its dedicated cosmic ray (CR) run, thereby confirming similar findings from the LEP era at CERN (in the CosmoLEP project). Originally, it was argued that they apparently stem from the primary CRs with a heavy masses. We propose an alternative possibility arguing that muonic bundles of highest multiplicity are produced by strangelets, hypothetical stable lumps of strange quark matter infiltrating our universe. We also address the possibility of additionally deducing their directionality which could be of astrophysical interest. Significant evidence for anisotropy of arrival directions of the observed high-multiplicity muonic bundles is found. Estimated directionality suggests their possible extragalactic provenance.

Authors:
; ;  [1];  [2]
  1. Institute of Physics, Jan Kochanowski University, 25-406 Kielce (Poland)
  2. National Centre for Nuclear Research, Department of Fundamental Research, 00-681 Warsaw (Poland)
Publication Date:
OSTI Identifier:
22661157
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 839; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ALICE; ALICE DETECTOR; ANISOTROPY; ASTROPHYSICS; CERN; COSMIC RADIATION; LEP STORAGE RINGS; MASS; MULTIPLICITY; QUARK MATTER; S QUARKS; UNIVERSE

Citation Formats

Kankiewicz, P., Rybczyński, M., Włodarczyk, Z., and Wilk, G., E-mail: pawel.kankiewicz@ujk.edu.pl, E-mail: maciej.rybczynski@ujk.edu.pl, E-mail: zbigniew.wlodarczyk@ujk.edu.pl, E-mail: grzegorz.wilk@ncbj.gov.pl. Muon Bundles as a Sign of Strangelets from the Universe. United States: N. p., 2017. Web. doi:10.3847/1538-4357/AA67EE.
Kankiewicz, P., Rybczyński, M., Włodarczyk, Z., & Wilk, G., E-mail: pawel.kankiewicz@ujk.edu.pl, E-mail: maciej.rybczynski@ujk.edu.pl, E-mail: zbigniew.wlodarczyk@ujk.edu.pl, E-mail: grzegorz.wilk@ncbj.gov.pl. Muon Bundles as a Sign of Strangelets from the Universe. United States. doi:10.3847/1538-4357/AA67EE.
Kankiewicz, P., Rybczyński, M., Włodarczyk, Z., and Wilk, G., E-mail: pawel.kankiewicz@ujk.edu.pl, E-mail: maciej.rybczynski@ujk.edu.pl, E-mail: zbigniew.wlodarczyk@ujk.edu.pl, E-mail: grzegorz.wilk@ncbj.gov.pl. Mon . "Muon Bundles as a Sign of Strangelets from the Universe". United States. doi:10.3847/1538-4357/AA67EE.
@article{osti_22661157,
title = {Muon Bundles as a Sign of Strangelets from the Universe},
author = {Kankiewicz, P. and Rybczyński, M. and Włodarczyk, Z. and Wilk, G., E-mail: pawel.kankiewicz@ujk.edu.pl, E-mail: maciej.rybczynski@ujk.edu.pl, E-mail: zbigniew.wlodarczyk@ujk.edu.pl, E-mail: grzegorz.wilk@ncbj.gov.pl},
abstractNote = {Recently, the CERN ALICE experiment observed muon bundles of very high multiplicities in its dedicated cosmic ray (CR) run, thereby confirming similar findings from the LEP era at CERN (in the CosmoLEP project). Originally, it was argued that they apparently stem from the primary CRs with a heavy masses. We propose an alternative possibility arguing that muonic bundles of highest multiplicity are produced by strangelets, hypothetical stable lumps of strange quark matter infiltrating our universe. We also address the possibility of additionally deducing their directionality which could be of astrophysical interest. Significant evidence for anisotropy of arrival directions of the observed high-multiplicity muonic bundles is found. Estimated directionality suggests their possible extragalactic provenance.},
doi = {10.3847/1538-4357/AA67EE},
journal = {Astrophysical Journal},
number = 1,
volume = 839,
place = {United States},
year = {Mon Apr 10 00:00:00 EDT 2017},
month = {Mon Apr 10 00:00:00 EDT 2017}
}
  • The consequences of novel high-energy electroweak phenomena are studied in the context of cosmic-ray physics. The production of many electroweak gauge bosons ({congruent}30--100) by cosmic rays gives rise to large zenith-angle multimuon events which are free of background. We find detection rates of up to a few events per year for neutrino-induced phenomena in detectors currently under construction.
  • We point out that both the specific lepton number content and the high energies potentially attainable with muon-muon colliders make it advisable to consider the technical feasibility of including an option of like-sign incoming beams in the studies towards a proposal to build a muon-muon collider with center-of-mass energies in the TeV region. This capability will add some unique physics capabilities to the project. Special attention will have to be paid to polarization retention for the muons. {copyright} {ital 1995 American Institute of Physics.}
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  • The high-energy activity in the inner few degrees of the Galactic center is traced by diffuse radio, X-ray, and {gamma}-ray emission. The physical relationship between different components of diffuse gas emitting at multiple wavelengths is a focus of this work. We first present radio continuum observations using the Green Bank Telescope and model the nonthermal spectrum in terms of a broken power-law distribution of {approx}GeV electrons emitting synchrotron radiation. We show that the emission detected by Fermi is primarily due to nonthermal bremsstrahlung produced by the population of synchrotron emitting electrons in the GeV energy range interacting with neutral gas.more » The extrapolation of the electron population measured from radio data to low and high energies can also explain the origin of Fe I 6.4 keV line and diffuse TeV emission, as observed with Suzaku, XMM-Newton, Chandra, and the H.E.S.S. observatories. The inferred physical quantities from modeling multiwavelength emission in the context of bremsstrahlung emission from the inner {approx}300 Multiplication-Sign 120 pc of the Galactic center are constrained to have the cosmic-ray ionization rate {approx}1-10 Multiplication-Sign 10{sup -15} s{sup -1}, molecular gas heating rate elevating the gas temperature to 75-200 K, fractional ionization of molecular gas 10{sup -6}-10{sup -5}, large-scale magnetic field 10-20 {mu}G, the density of diffuse and dense molecular gas {approx}100 and {approx}10{sup 3} cm{sup -3} over 300 pc and 50 pc path lengths, and the variability of Fe I K{alpha} 6.4 keV line emission on yearly timescales. Important implications of our study are that GeV electrons emitting in radio can explain the GeV {gamma}-rays detected by Fermi and that the cosmic-ray irradiation model, like the model of the X-ray irradiation triggered by past activity of Sgr A*, can also explain the origin of the variable 6.4 keV emission from Galactic center molecular clouds.« less