{"title":"Gamma-ray signal from ZN≥3 dark matter-companion models","authors":"","doi":"10.1016/j.physletb.2024.139011","DOIUrl":null,"url":null,"abstract":"<div><p>In Ref. <span><span>[10]</span></span>, we proposed to replace the final dark matter (DM) particle in the semi-annihilation mode <span><math><mrow><mi>DM</mi></mrow><mo>+</mo><mrow><mi>DM</mi><mo>→</mo><mi>antiDM</mi></mrow><mo>+</mo><mrow><mi>Higgs boson</mi></mrow></math></span> with its <span><math><msub><mrow><mi>Z</mi></mrow><mrow><mi>N</mi><mo>≥</mo><mn>3</mn></mrow></msub></math></span> companion, thus reducing DM number density without DM-nucleon scattering. In this work, we study the indirect detection signals from DM annihilation, the Higgs boson pair with one of them from the companion decay being on- or off- shell, depending on the DM-companion mass splitting. We generate the photon spectrum by using PYTHIA8 and study the properties of the spectrum, to find that the hard part of the spectrum in our model is mainly shaped by the direct Higgs boson and thus does not differ much from that of the conventional semi-annihilation mode. Using the Fermi-LAT data of dwarf spheroidal galaxies, we derive the current limit of the DM annihilation cross section for <span><math><mrow><mi>DM</mi></mrow><mo>+</mo><mrow><mi>DM</mi><mo>→</mo><mi>companio</mi><msup><mrow><mi>n</mi></mrow><mrow><mo>⁎</mo></mrow></msup></mrow><mo>+</mo><mrow><mi>Higgs boson</mi></mrow></math></span>, and for the relatively light DM, it reaches the typical thermal cross section. However, for the TeV scale DM, we have to rely on the Cherenkov Telescope Array, which is able to rule out the whole parameter space except for the coannihilation region.</p></div>","PeriodicalId":20162,"journal":{"name":"Physics Letters B","volume":null,"pages":null},"PeriodicalIF":4.3000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S0370269324005690/pdfft?md5=aede290774561c1a2b0a57df0f15ac27&pid=1-s2.0-S0370269324005690-main.pdf","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics Letters B","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0370269324005690","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ASTRONOMY & ASTROPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
In Ref. [10], we proposed to replace the final dark matter (DM) particle in the semi-annihilation mode with its companion, thus reducing DM number density without DM-nucleon scattering. In this work, we study the indirect detection signals from DM annihilation, the Higgs boson pair with one of them from the companion decay being on- or off- shell, depending on the DM-companion mass splitting. We generate the photon spectrum by using PYTHIA8 and study the properties of the spectrum, to find that the hard part of the spectrum in our model is mainly shaped by the direct Higgs boson and thus does not differ much from that of the conventional semi-annihilation mode. Using the Fermi-LAT data of dwarf spheroidal galaxies, we derive the current limit of the DM annihilation cross section for , and for the relatively light DM, it reaches the typical thermal cross section. However, for the TeV scale DM, we have to rely on the Cherenkov Telescope Array, which is able to rule out the whole parameter space except for the coannihilation region.
期刊介绍:
Physics Letters B ensures the rapid publication of important new results in particle physics, nuclear physics and cosmology. Specialized editors are responsible for contributions in experimental nuclear physics, theoretical nuclear physics, experimental high-energy physics, theoretical high-energy physics, and astrophysics.