Quantifying galactic propagation uncertainty in WIMP dark matter search with AMS01 Z=-1 spectrum
Name
535501821-MIT.pdf
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Full printable version
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20.85 MB
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Checksum (MD5)
a70ede855726f7550120030497f11384
Author(s)
Xiao, Sa, Ph. D. Massachusetts Institute of Technology
Advisor(s)
Peter Fisher.
Alternative Title
Quantifying galactic propagation uncertainty in WIMP dark matter search with AMS01 electron spectrum
Date Issued
2009
Publisher
Massachusetts Institute of Technology
Abstract
A search for a WIMP dark matter annihilation signal is carried out in the AMS01 negatively charged (Z=-I) particle spectrum, following a set of supersymmetric benchmark scenarios in the mSUGRA framework. The result is consistent with no dark matter, assuming a smooth isothermal distribution of dark matter in the Galactic halo. 90% upper bounds of the boost factor by which the flux from the DM annihilation could be enhanced without exceeding AMS01 data are derived to be - 10² - 10⁵, varied as different mSUGRA senarios. The Boron-to-Carbon ratio energy spectrum is measured with AMS01, which allows us to constrain the cosmic ray (CR) Galactic propagation parameters. In the diffusive reaccelaration (DR) model, the propagation parameters are shown to be Dxx ~ 4.5 x 10₂₈ - 6 x 10²⁸ cm² S-1, and VA ~ 28 - 42 km s-1. The impact of the uncertainties in the cosmic ray propagation model on dark matter limits is studied and the associated uncertainties of the 90% upper bound of the boost factor are found to be less than 30%.
Description
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2009.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 89-91).
Subjects
Physics.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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