<div dir="ltr"><div><div><div>Hi all,<br><br>Jia Liu, Neal Weiner, and Wei Xue just put out a paper on using light dark-photon models to explain the galactic-center gamma-ray excess. <br clear="all"><a href="http://arxiv.org/abs/1412.1485">http://arxiv.org/abs/1412.1485</a><br><br></div>I have only just glanced at it, but the punchlines seem to be:<br></div>- GeV-scale dark-sector models can fit the GC excess spectrum very well<br>- there is a stringent constraint from AMS-2 on DM annihilation to A' A' -> 2e+2e-, which excludes simple sub-GeV dark photon scenarios but allows either annihilation to heavier dark photons (~1.5 GeV) or annihilation that's dominated by dark-sector scalars rather than dark photons. <br><br></div><div>Best regards,<br>Natalia<br></div><br><div><div><div><div>-- <br><div class="gmail_signature"><div dir="ltr"><div><div>Natalia Toro<br>Perimeter Institute<br></div>31 Caroline St N, Waterloo, ON<br></div>(519) 569-7600 x8725<br></div></div>
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