The PAMELA excess from neutralino annihilation in the NMSSM

Journal Article · Fri May 01 00:00:00 EDT 2009 · Phys.Rev.D

DOI:https://doi.org/10.1103/PhysRevD.80.055004· OSTI ID:3019871

Bai, Yang ^[1]; Carena, Marcela ^[2]; Lykken, Joseph ^[1]

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1. Fermilab
2. Fermilab; Chicago U., EFI

The cosmic ray positron excess observed by PAMELA can be explained by neutralino annihilation in the Next-to-Minimal Supersymmetric Standard Model (NMSSM). The main dark matter annihilation products are the lightest CP-even scalar h1 plus the lightest CP-odd scalar a1, with the a1 decaying into two muons. The energetic positrons needed to explain PAMELA are thus obtained in the NMSSM simply from kinematics. The required large annihilation cross section is obtained from an s-channel resonance with the heavier CP-odd scalar a2. Various experiments constrain the PAMELA-favored NMSSM parameter space, including collider searches for a light a1. These constraints point to a unique corner of the NMSSM parameter space, having a lightest neutralino mass around 160 GeV and a very light pseudoscalar mass less than a GeV. A simple parameterized formula for the charge-dependent solar modulation effects reconciles the discrepancy between the PAMELA data and the estimated background at lower energies. We also discuss the electron and gamma ray spectra from the Fermi LAT observations. An NMSSM explanation of PAMELA makes three striking and uniquely correlated predictions: the rise in the PAMELA positron spectrum will turn over at around 70 GeV, the dark matter particle mass is less than the top quark mass, and a light sub-GeV pseudoscalar will be discovered at colliders.

• Research Organization: Chicago U., EFI; Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: US Department of Energy
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 3019871
• Report Number(s): FERMILAB-PUB-09-115-T; oai:inspirehep.net:820781; arXiv:0905.2964
• Journal Information: Phys.Rev.D, Journal Name: Phys.Rev.D Vol. 80
• Country of Publication: United States
• Language: English