3 years ago

# Connecting Particle Physics and Cosmology: Measuring the Dark Matter Relic Density in Compressed Supersymmetry at the LHC.

Alfredo Gurrola, Andrés Flórez, Dale Julson, Savanna Starko, Carlos Ávila

The identity of Dark Matter (DM) is one of the most captivating topics in particle physics today. The R-parity conserving Minimal Supersymmetric Standard Model (MSSM), which naturally provides a DM candidate in the form of the lightest neutralino ($\tilde{\chi}_{1}^{0}$), is used as a benchmark scenario to show that a measurement of $\Omega_{\tilde{\chi}_{1}^{0}}h^{2}$ can be achieved from measurements at the CERN Large Hadron Collider. Focus is placed on compressed mass spectra regions, where the mass difference between the $\tilde{\chi}_{1}^{0}$ and the $\tilde{\tau}_{1}$ is small and where the $\tilde{\tau}_{1}$-$\tilde{\chi}_{1}^{0}$ coannihilation (CA) mechanism of the early Universe plays an important role. The technique for measuring $\Omega_{\tilde{\chi}_{1}^{0}}h^{2}$ relies on two proposed searches for compressed Supersymmetry (SUSY): 1) production via Vector Boson Fusion (VBF) processes; and 2) production with associated energetic jets from initial state radiation (ISR). These approaches allow for the determination of the relic abundance at the LHC for any model where CA is an important DM reduction mechanism in the early Universe. Thus, it is possible to confirm that the DM we observe today were $\tilde{\chi}_{1}^{0} s created in the early Universe. We show that from measurements in the VBF and ISR SUSY searches at the LHC, the dark matter relic density can be measured with an uncertainty of 25\% with 3000 fb$^{-1}$of 13 TeV proton-proton data. Publisher URL: http://arxiv.org/abs/1801.03966 DOI: arXiv:1801.03966v1 You might also like Discover & Discuss Important Research Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free. Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article. s created in the early Universe. We\nshow that from measurements in the VBF and ISR SUSY searches at the LHC, the\ndark matter relic density can be measured with an uncertainty of 25\\% with 3000\nfb$^{-1}$of 13 TeV proton-proton data.\n ","htmlAbstract":null,"createdDate":"2019-10-03T09:34:53.000Z","media":null,"settings":null,"pdfUrl":"https://arxiv.org/pdf/1801.03966","openAccessUrl":null,"authors":{"type":"json","json":["Alfredo Gurrola","Andr&#xe9;s Fl&#xf3;rez","Dale Julson","Savanna Starko","Carlos &#xc1;vila"]},"contentType":null,"actionButton":null,"journal":{"type":"id","generated":false,"id":"Journal:1220","typename":"Journal"},"headlineImage":null,"__typename":"V4Paper","doi":"arXiv:1801.03966v1","paperUrl":"http://arxiv.org/abs/1801.03966","metrics":{"type":"id","generated":true,"id":"$V4Paper:259575.metrics","typename":"Metrics"}},"Journal:1220":{"id":"1220","name":"arXiv High Energy Physics - Phenomenology","cover":{"type":"id","generated":true,"id":"$Journal:1220.cover","typename":"Image"},"__typename":"Journal"},"$Journal:1220.cover":{"baseURL":"https://s3-eu-west-1.amazonaws.com/stackademic/assets/journal_cover_arxviv.png","__typename":"Image"},"$V4Paper:259575.metrics":{"selectedCount":1,"viewedCount":0,"bookmarkedCount":0,"__typename":"Metrics"}}; window.__REDUX_STATE__ = {"feed":{"scrollPos":0,"openAccess":false,"performRefetch":{}},"history":{"historyChanges":0},"onboarding":{"stepsList":[{"stepId":"type","stepName":"What kind of researcher are you?","stepDesc":"","options":[]},{"stepId":"Role","stepName":"What role describes you the best?","stepDesc":"","options":[]},{"stepId":"Org","stepName":"Where do you work or study?","stepDesc":""},{"stepId":"ra","stepName":"Research Areas","stepDesc":"Select the research areas you are interested in","options":[]},{"stepId":"topics","stepName":"Topics","stepDesc":"Select the topics you are interested in","options":[]},{"stepId":"publications","stepName":"Publications","stepDesc":"We have selected some popular publications for you to follow","options":[]},{"stepId":"feeds","stepName":"Feeds","stepDesc":"We have created this feed based on your interests, you can edit and add more from the side menu","options":[]}],"step":1,"loading":false,"loadingText":"Loading...","selections":[{"name":"type","selection":null,"type":"single","mandatory":true},{"name":"role","selection":null,"type":"single","mandatory":true},{"name":"work_study","selection":null,"type":"single","mandatory":false},{"name":"ra","selection":[],"type":"multiple","mandatory":true},{"name":"topics","selection":[],"type":"multiple","mandatory":true},{"name":"publications","selection":[],"type":"multiple","mandatory":false},{"name":"feeds","selection":[],"type":"multiple","mandatory":false}],"topicsNextCursor":null,"topicsFetchingNext":false}}; 3 years ago # Connecting Particle Physics and Cosmology: Measuring the Dark Matter Relic Density in Compressed Supersymmetry at the LHC. Alfredo Gurrola, Andrés Flórez, Dale Julson, Savanna Starko, Carlos Ávila The identity of Dark Matter (DM) is one of the most captivating topics in particle physics today. The R-parity conserving Minimal Supersymmetric Standard Model (MSSM), which naturally provides a DM candidate in the form of the lightest neutralino ($\tilde{\chi}_{1}^{0}$), is used as a benchmark scenario to show that a measurement of$\Omega_{\tilde{\chi}_{1}^{0}}h^{2}$can be achieved from measurements at the CERN Large Hadron Collider. Focus is placed on compressed mass spectra regions, where the mass difference between the$\tilde{\chi}_{1}^{0}$and the$\tilde{\tau}_{1}$is small and where the$\tilde{\tau}_{1}$-$\tilde{\chi}_{1}^{0}$coannihilation (CA) mechanism of the early Universe plays an important role. The technique for measuring$\Omega_{\tilde{\chi}_{1}^{0}}h^{2}$relies on two proposed searches for compressed Supersymmetry (SUSY): 1) production via Vector Boson Fusion (VBF) processes; and 2) production with associated energetic jets from initial state radiation (ISR). These approaches allow for the determination of the relic abundance at the LHC for any model where CA is an important DM reduction mechanism in the early Universe. Thus, it is possible to confirm that the DM we observe today were$\tilde{\chi}_{1}^{0}

s created in the early Universe. We show that from measurements in the VBF and ISR SUSY searches at the LHC, the dark matter relic density can be measured with an uncertainty of 25\% with 3000 fb$^{-1}$ of 13 TeV proton-proton data.

Publisher URL: http://arxiv.org/abs/1801.03966

DOI: arXiv:1801.03966v1

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Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.