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Metastable Charged Sparticles and the Cosmological Li7 Problem

We consider the effects of metastable charged sparticles on Big-Bang Nucleosynthesis (BBN), including bound-state reaction rates and chemical effects. We make a new analysis of the bound states of negatively-charged massive particles with the light nuclei most prominent in BBN, and present a new cod...

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Detalles Bibliográficos
Autores principales: Cyburt, Richard H., Ellis, John, Fields, Brian D., Luo, Feng, Olive, Keith A., Spanos, Vassilis C.
Lenguaje:eng
Publicado: 2012
Materias:
Acceso en línea:https://dx.doi.org/10.1088/1475-7516/2012/12/037
http://cds.cern.ch/record/1476603
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author Cyburt, Richard H.
Ellis, John
Fields, Brian D.
Luo, Feng
Olive, Keith A.
Spanos, Vassilis C.
author_facet Cyburt, Richard H.
Ellis, John
Fields, Brian D.
Luo, Feng
Olive, Keith A.
Spanos, Vassilis C.
author_sort Cyburt, Richard H.
collection CERN
description We consider the effects of metastable charged sparticles on Big-Bang Nucleosynthesis (BBN), including bound-state reaction rates and chemical effects. We make a new analysis of the bound states of negatively-charged massive particles with the light nuclei most prominent in BBN, and present a new code to track their abundances, paying particular attention to that of Li7. Assuming, as an example, that the gravitino is the lightest supersymmetric particle (LSP), and that the lighter stau slepton, stau_1, is the metastable next-to-lightest sparticle within the constrained minimal supersymmetric extension of the Standard Model (CMSSM), we analyze the possible effects on the standard BBN abundances of stau_1 bound states and decays for representative values of the gravitino mass. Taking into account the constraint on the CMSSM parameter space imposed by the discovery of the Higgs boson at the LHC, we delineate regions in which the fit to the measured light-element abundances is as good as in standard BBN. We also identify regions of the CMSSM parameter space in which the bound state properties, chemistry and decays of metastable charged sparticles can solve the cosmological Li7 problem.
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publishDate 2012
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spelling cern-14766032023-10-20T02:39:22Zdoi:10.1088/1475-7516/2012/12/037http://cds.cern.ch/record/1476603engCyburt, Richard H.Ellis, JohnFields, Brian D.Luo, FengOlive, Keith A.Spanos, Vassilis C.Metastable Charged Sparticles and the Cosmological Li7 ProblemAstrophysics and AstronomyWe consider the effects of metastable charged sparticles on Big-Bang Nucleosynthesis (BBN), including bound-state reaction rates and chemical effects. We make a new analysis of the bound states of negatively-charged massive particles with the light nuclei most prominent in BBN, and present a new code to track their abundances, paying particular attention to that of Li7. Assuming, as an example, that the gravitino is the lightest supersymmetric particle (LSP), and that the lighter stau slepton, stau_1, is the metastable next-to-lightest sparticle within the constrained minimal supersymmetric extension of the Standard Model (CMSSM), we analyze the possible effects on the standard BBN abundances of stau_1 bound states and decays for representative values of the gravitino mass. Taking into account the constraint on the CMSSM parameter space imposed by the discovery of the Higgs boson at the LHC, we delineate regions in which the fit to the measured light-element abundances is as good as in standard BBN. We also identify regions of the CMSSM parameter space in which the bound state properties, chemistry and decays of metastable charged sparticles can solve the cosmological Li7 problem.We consider the effects of metastable charged sparticles on Big-Bang Nucleosynthesis (BBN), including bound-state reaction rates and chemical effects. We make a new analysis of the bound states of negatively-charged massive particles with the light nuclei most prominent in BBN, and present a new code to track their abundances, paying particular attention to that of Li7. Assuming, as an example, that the gravitino is the lightest supersymmetric particle (LSP), and that the lighter stau slepton, stau_1, is the metastable next-to-lightest sparticle within the constrained minimal supersymmetric extension of the Standard Model (CMSSM), we analyze the possible effects on the standard BBN abundances of stau_1 bound states and decays for representative values of the gravitino mass. Taking into account the constraint on the CMSSM parameter space imposed by the discovery of the Higgs boson at the LHC, we delineate regions in which the fit to the measured light-element abundances is as good as in standard BBN. We also identify regions of the CMSSM parameter space in which the bound state properties, chemistry and decays of metastable charged sparticles can solve the cosmological Li7 problem.arXiv:1209.1347KCL-PH-TH-2012-36LCTS-2012-18CERN-PH-TH-2012-223FTPI-MINN-12-29UMN-TH-3117-12KCL-PH-TH-2012-36LCTS-2012-18CERN-PH-TH-2012-223UMN-TH-3117-12FTPI-MINN-12-29oai:cds.cern.ch:14766032012-09-07
spellingShingle Astrophysics and Astronomy
Cyburt, Richard H.
Ellis, John
Fields, Brian D.
Luo, Feng
Olive, Keith A.
Spanos, Vassilis C.
Metastable Charged Sparticles and the Cosmological Li7 Problem
title Metastable Charged Sparticles and the Cosmological Li7 Problem
title_full Metastable Charged Sparticles and the Cosmological Li7 Problem
title_fullStr Metastable Charged Sparticles and the Cosmological Li7 Problem
title_full_unstemmed Metastable Charged Sparticles and the Cosmological Li7 Problem
title_short Metastable Charged Sparticles and the Cosmological Li7 Problem
title_sort metastable charged sparticles and the cosmological li7 problem
topic Astrophysics and Astronomy
url https://dx.doi.org/10.1088/1475-7516/2012/12/037
http://cds.cern.ch/record/1476603
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