Signals of a light dark force in the galactic center
Recent evidence for an excess of gamma rays in the GeV energy range about the Galactic Center have refocused attention on models of dark matter in the low mass regime (m[subscript χ] ≲ m[subscript Z]/2). Because this is an experimentally well-trod energy range, it can be a challenge to develop simpl...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | English |
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Springer-Verlag/SISSA
2017
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| Online Access: | http://hdl.handle.net/1721.1/107948 https://orcid.org/0000-0002-6809-7545 |
| _version_ | 1826199363949428736 |
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| author | Liu, Jia Weiner, Neal Xue, Wei |
| author2 | Massachusetts Institute of Technology. Center for Theoretical Physics |
| author_facet | Massachusetts Institute of Technology. Center for Theoretical Physics Liu, Jia Weiner, Neal Xue, Wei |
| author_sort | Liu, Jia |
| collection | MIT |
| description | Recent evidence for an excess of gamma rays in the GeV energy range about the Galactic Center have refocused attention on models of dark matter in the low mass regime (m[subscript χ] ≲ m[subscript Z]/2). Because this is an experimentally well-trod energy range, it can be a challenge to develop simple models that explain this excess, consistent with other experimental constraints. We reconsider models where the dark matter couples to dark photon, which has a weak kinetic mixing to the Standard Model photon, or scalars with a weak mixing with the Higgs boson. We focus on the light (≲1.5 GeV) dark mediator mass regime. Annihilations into the dark mediators can produce observable gamma rays through decays to π0, through radiative processes when decaying to charged particles (e+e−, μ+μ−, . . .), and subsequent interactions of high energy e+e− with gas and light. However, these models have no signals of p¯ production, which is kinematically forbidden. We find that in these models, the shape of resulting gamma-ray spectrum can provide a good fit to the excess at Galactic Center. We discuss further constraints from AMS-02 and the CMB, and find regions of compatibility. |
| first_indexed | 2024-09-23T11:18:42Z |
| format | Article |
| id | mit-1721.1/107948 |
| institution | Massachusetts Institute of Technology |
| language | English |
| last_indexed | 2024-09-23T11:18:42Z |
| publishDate | 2017 |
| publisher | Springer-Verlag/SISSA |
| record_format | dspace |
| spelling | mit-1721.1/1079482022-09-27T18:40:16Z Signals of a light dark force in the galactic center Liu, Jia Weiner, Neal Xue, Wei Massachusetts Institute of Technology. Center for Theoretical Physics Xue, Wei Recent evidence for an excess of gamma rays in the GeV energy range about the Galactic Center have refocused attention on models of dark matter in the low mass regime (m[subscript χ] ≲ m[subscript Z]/2). Because this is an experimentally well-trod energy range, it can be a challenge to develop simple models that explain this excess, consistent with other experimental constraints. We reconsider models where the dark matter couples to dark photon, which has a weak kinetic mixing to the Standard Model photon, or scalars with a weak mixing with the Higgs boson. We focus on the light (≲1.5 GeV) dark mediator mass regime. Annihilations into the dark mediators can produce observable gamma rays through decays to π0, through radiative processes when decaying to charged particles (e+e−, μ+μ−, . . .), and subsequent interactions of high energy e+e− with gas and light. However, these models have no signals of p¯ production, which is kinematically forbidden. We find that in these models, the shape of resulting gamma-ray spectrum can provide a good fit to the excess at Galactic Center. We discuss further constraints from AMS-02 and the CMB, and find regions of compatibility. 2017-04-07T17:50:47Z 2017-04-07T17:50:47Z 2015-08 2015-07 2016-05-23T09:37:21Z Article http://purl.org/eprint/type/JournalArticle 1029-8479 http://hdl.handle.net/1721.1/107948 Liu, Jia, Neal Weiner, and Wei Xue. “Signals of a Light Dark Force in the Galactic Center.” Journal of High Energy Physics 2015.8 (2015): n. pag. https://orcid.org/0000-0002-6809-7545 en http://dx.doi.org/10.1007/JHEP08(2015)050 Journal of High Energy Physics Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ The Author(s) application/pdf Springer-Verlag/SISSA Springer Berlin Heidelberg |
| spellingShingle | Liu, Jia Weiner, Neal Xue, Wei Signals of a light dark force in the galactic center |
| title | Signals of a light dark force in the galactic center |
| title_full | Signals of a light dark force in the galactic center |
| title_fullStr | Signals of a light dark force in the galactic center |
| title_full_unstemmed | Signals of a light dark force in the galactic center |
| title_short | Signals of a light dark force in the galactic center |
| title_sort | signals of a light dark force in the galactic center |
| url | http://hdl.handle.net/1721.1/107948 https://orcid.org/0000-0002-6809-7545 |
| work_keys_str_mv | AT liujia signalsofalightdarkforceinthegalacticcenter AT weinerneal signalsofalightdarkforceinthegalacticcenter AT xuewei signalsofalightdarkforceinthegalacticcenter |