On the LHC sensitivity for non-thermalised hidden sectors

On the LHC sensitivity for non-thermalised hidden sectors

We show under rather general assumptions that hidden sectors that never reach thermal equilibrium in the early Universe are also inaccessible for the LHC. In other words, any particle that can be produced at the LHC must either have been in thermal equilibrium with the Standard Model at some point o...

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Main Author: Felix Kahlhoefer
Format: Article
Language:English
Published: Elsevier 2018-04-01
Series:Physics Letters B
Online Access:http://www.sciencedirect.com/science/article/pii/S0370269318301382
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spelling doaj-f9db2471dc5d4f46849ee904a6d845442020-11-24T20:50:15ZengElsevierPhysics Letters B0370-26932018-04-01779388392On the LHC sensitivity for non-thermalised hidden sectorsFelix Kahlhoefer0Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University, D-52056 Aachen, GermanyWe show under rather general assumptions that hidden sectors that never reach thermal equilibrium in the early Universe are also inaccessible for the LHC. In other words, any particle that can be produced at the LHC must either have been in thermal equilibrium with the Standard Model at some point or must be produced via the decays of another hidden sector particle that has been in thermal equilibrium. To reach this conclusion, we parametrise the cross section connecting the Standard Model to the hidden sector in a very general way and use methods from linear programming to calculate the largest possible number of LHC events compatible with the requirement of non-thermalisation. We find that even the HL-LHC cannot possibly produce more than a few events with energy above 10 GeV involving states from a non-thermalised hidden sector. Keywords: Cosmology of theories beyond the Standard Model, LHC searches for hidden sectorshttp://www.sciencedirect.com/science/article/pii/S0370269318301382
collection DOAJ
language English
format Article
sources DOAJ
author Felix Kahlhoefer
spellingShingle Felix Kahlhoefer
On the LHC sensitivity for non-thermalised hidden sectors
Physics Letters B
author_facet Felix Kahlhoefer
author_sort Felix Kahlhoefer
title On the LHC sensitivity for non-thermalised hidden sectors
title_short On the LHC sensitivity for non-thermalised hidden sectors
title_full On the LHC sensitivity for non-thermalised hidden sectors
title_fullStr On the LHC sensitivity for non-thermalised hidden sectors
title_full_unstemmed On the LHC sensitivity for non-thermalised hidden sectors
title_sort on the lhc sensitivity for non-thermalised hidden sectors
publisher Elsevier
series Physics Letters B
issn 0370-2693
publishDate 2018-04-01
description We show under rather general assumptions that hidden sectors that never reach thermal equilibrium in the early Universe are also inaccessible for the LHC. In other words, any particle that can be produced at the LHC must either have been in thermal equilibrium with the Standard Model at some point or must be produced via the decays of another hidden sector particle that has been in thermal equilibrium. To reach this conclusion, we parametrise the cross section connecting the Standard Model to the hidden sector in a very general way and use methods from linear programming to calculate the largest possible number of LHC events compatible with the requirement of non-thermalisation. We find that even the HL-LHC cannot possibly produce more than a few events with energy above 10 GeV involving states from a non-thermalised hidden sector. Keywords: Cosmology of theories beyond the Standard Model, LHC searches for hidden sectors
url http://www.sciencedirect.com/science/article/pii/S0370269318301382
work_keys_str_mv AT felixkahlhoefer onthelhcsensitivityfornonthermalisedhiddensectors
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