{"id":4775,"date":"2014-01-01T00:00:00","date_gmt":"2014-01-01T08:00:00","guid":{"rendered":"https:\/\/wpdev.hmc.edu\/physics\/2014\/01\/01\/bottom-up-approach-to-the-galactic-center-excess\/"},"modified":"2014-01-01T00:00:00","modified_gmt":"2014-01-01T08:00:00","slug":"bottom-up-approach-to-the-galactic-center-excess","status":"publish","type":"physics_publications","link":"https:\/\/www.hmc.edu\/physics\/research\/publications\/bottom-up-approach-to-the-galactic-center-excess\/","title":{"rendered":"Bottom-up Approach to the Galactic Center Excess"},"content":{"rendered":"\n<p id=\"authors\">Eder Izaguirre, Gordan Krnjaic, and <span class=\"facauthor\">Brian Shuve<\/span><\/p>\n\n\n\n<p id=\"doc-link\"><a href=\"https:\/\/www.hmc.edu\/physics\/wp-content\/uploads\/sites\/22\/2023\/02\/pub-102.pdf\">Bottom-up Approach to the Galactic Center Excess (PDF)<\/a><\/p>\n\n\n\n<p id=\"journal\"><span class=\"journal-title\">Physical Review D<\/span> <strong data-vol=\"90\">90<\/strong> <span id=\"journal-year\">(2014)<\/span> <span id=\"journal-pages\" data-pages=\"18\">18<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Abstract<\/h2>\n\n\n\n<p>It has recently been shown that dark-matter annihilation to bottom quarks provides a good fit to the Galactic Center gamma-ray excess identified in the Fermi-LAT data. In the favored dark-matter mass range \\( m \\sim \\) 30\u201340 GeV, achieving the best-fit annihilation rate \\( \\sigma v \\sim 5 \\times 10^{-26} , \\mathrm{cm^3 s^{-1}} \\) with perturbative couplings requires a sub-TeV mediator particle that interacts with both dark matter and bottom quarks. In this paper, we consider the minimal viable scenarios in which a Standard Model singlet mediates <em>s<\/em>-channel interactions <em>only<\/em> between dark matter and bottom quarks, focusing on axial-vector, vector, and pseudoscalar couplings. Using simulations that include on-shell mediator production, we show that existing sbottom searches currently offer the strongest sensitivity over a large region of the favored parameter space explaining the gamma-ray excess, particularly for axial-vector interactions. The 13 TeV LHC will be even more sensitive; however, it may not be sufficient to fully cover the favored parameter space, and the pseudoscalar scenario will remain unconstrained by these searches. We also find that direct- detection constraints, induced through loops of bottom quarks, complement collider bounds to disfavor the vector-current interaction when the mediator is heavier than twice the dark-matter mass. We also present some simple models that generate pseudoscalar-mediated annihilation predominantly to bottom quarks.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Eder Izaguirre, Gordan Krnjaic, and Brian Shuve Bottom-up Approach to the Galactic Center Excess (PDF) Physical Review D 90 (2014) [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"template":"","publication_author":[23],"class_list":["post-4775","physics_publications","type-physics_publications","status-publish","hentry","publication_author-shuve"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.hmc.edu\/physics\/wp-json\/wp\/v2\/physics_publications\/4775","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.hmc.edu\/physics\/wp-json\/wp\/v2\/physics_publications"}],"about":[{"href":"https:\/\/www.hmc.edu\/physics\/wp-json\/wp\/v2\/types\/physics_publications"}],"author":[{"embeddable":true,"href":"https:\/\/www.hmc.edu\/physics\/wp-json\/wp\/v2\/users\/1"}],"wp:attachment":[{"href":"https:\/\/www.hmc.edu\/physics\/wp-json\/wp\/v2\/media?parent=4775"}],"wp:term":[{"taxonomy":"publication_author","embeddable":true,"href":"https:\/\/www.hmc.edu\/physics\/wp-json\/wp\/v2\/publication_author?post=4775"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}