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Title: Freeze-In dark matter with displaced signatures at colliders

Abstract

Dark matter, X, may be generated by new physics at the TeV scale during an early matter-dominated (MD) era that ends at temperature T{sub R} || TeV. Compared to the conventional radiation-dominated (RD) results, yields from both Freeze-Out and Freeze-In processes are greatly suppressed by dilution from entropy production, making Freeze-Out less plausible while allowing successful Freeze-In with a much larger coupling strength. Freeze-In is typically dominated by the decay of a particle B of the thermal bath, B → X. For a large fraction of the relevant cosmological parameter space, the decay rate required to produce the observed dark matter abundance leads to displaced signals at LHC and future colliders, for any m{sub X} in the range keV  < m{sub X} < m{sub B} and for values of m{sub B} accessible to these colliders. This result applies whether the early MD era arises after conventional inflation, when T{sub R} is the usual reheat temperature, or is a generic MD era with an alternative origin. In the former case, if m{sub X} is sufficiently large to be measured from kinematics, the reheat temperature T{sub R} can be extracted. Our result is independent of the particular particle physics implementation of B → X, and can occur via any operatormore » of dimension less than 8 (4) for a post-inflation (general MD) cosmology. An interesting example is provided by DFS axion theories with TeV-scale supersymmetry and axino dark matter of mass GeV to TeV, which is typically overproduced in a conventional RD cosmology. If B is the higgsino, h-tilde , Higgs, W and Z particles appear at the displaced decays, h-tilde  →  h-tilde  a, Z ã and h-tilde {sup ±} → W{sup ±} ã. The scale of axion physics, f, is predicted to be in the range (3×10{sup 8}—10{sup 12}) GeV and, over much of this range, can be extracted from the decay length.« less

Authors:
; ; ;  [1]
  1. Berkeley Center for Theoretical Physics, Department of Physics, and Theoretical Physics Group, Lawrence Berkeley National Laboratory, University of California, Berkeley, CA 94720 (United States)
Publication Date:
OSTI Identifier:
22525132
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2015; Journal Issue: 12; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CERN LHC; COMPARATIVE EVALUATIONS; COSMOLOGY; COUPLING; DILUTION; ENTROPY; FREEZING OUT; GEV RANGE; HIGGS BOSONS; HIGGS MODEL; KEV RANGE; NONLUMINOUS MATTER; SPACE; SUPERSYMMETRY; TEV RANGE

Citation Formats

Co, Raymond T., D'Eramo, Francesco, Hall, Lawrence J., and Pappadopulo, Duccio, E-mail: co@berkeley.edu, E-mail: fderamo@ucsc.edu, E-mail: ljhall@lbl.gov, E-mail: duccio.pappadopulo@gmail.com. Freeze-In dark matter with displaced signatures at colliders. United States: N. p., 2015. Web. doi:10.1088/1475-7516/2015/12/024.
Co, Raymond T., D'Eramo, Francesco, Hall, Lawrence J., & Pappadopulo, Duccio, E-mail: co@berkeley.edu, E-mail: fderamo@ucsc.edu, E-mail: ljhall@lbl.gov, E-mail: duccio.pappadopulo@gmail.com. Freeze-In dark matter with displaced signatures at colliders. United States. doi:10.1088/1475-7516/2015/12/024.
Co, Raymond T., D'Eramo, Francesco, Hall, Lawrence J., and Pappadopulo, Duccio, E-mail: co@berkeley.edu, E-mail: fderamo@ucsc.edu, E-mail: ljhall@lbl.gov, E-mail: duccio.pappadopulo@gmail.com. Tue . "Freeze-In dark matter with displaced signatures at colliders". United States. doi:10.1088/1475-7516/2015/12/024.
@article{osti_22525132,
title = {Freeze-In dark matter with displaced signatures at colliders},
author = {Co, Raymond T. and D'Eramo, Francesco and Hall, Lawrence J. and Pappadopulo, Duccio, E-mail: co@berkeley.edu, E-mail: fderamo@ucsc.edu, E-mail: ljhall@lbl.gov, E-mail: duccio.pappadopulo@gmail.com},
abstractNote = {Dark matter, X, may be generated by new physics at the TeV scale during an early matter-dominated (MD) era that ends at temperature T{sub R} || TeV. Compared to the conventional radiation-dominated (RD) results, yields from both Freeze-Out and Freeze-In processes are greatly suppressed by dilution from entropy production, making Freeze-Out less plausible while allowing successful Freeze-In with a much larger coupling strength. Freeze-In is typically dominated by the decay of a particle B of the thermal bath, B → X. For a large fraction of the relevant cosmological parameter space, the decay rate required to produce the observed dark matter abundance leads to displaced signals at LHC and future colliders, for any m{sub X} in the range keV  < m{sub X} < m{sub B} and for values of m{sub B} accessible to these colliders. This result applies whether the early MD era arises after conventional inflation, when T{sub R} is the usual reheat temperature, or is a generic MD era with an alternative origin. In the former case, if m{sub X} is sufficiently large to be measured from kinematics, the reheat temperature T{sub R} can be extracted. Our result is independent of the particular particle physics implementation of B → X, and can occur via any operator of dimension less than 8 (4) for a post-inflation (general MD) cosmology. An interesting example is provided by DFS axion theories with TeV-scale supersymmetry and axino dark matter of mass GeV to TeV, which is typically overproduced in a conventional RD cosmology. If B is the higgsino, h-tilde , Higgs, W and Z particles appear at the displaced decays, h-tilde  →  h-tilde  a, Z ã and h-tilde {sup ±} → W{sup ±} ã. The scale of axion physics, f, is predicted to be in the range (3×10{sup 8}—10{sup 12}) GeV and, over much of this range, can be extracted from the decay length.},
doi = {10.1088/1475-7516/2015/12/024},
journal = {Journal of Cosmology and Astroparticle Physics},
number = 12,
volume = 2015,
place = {United States},
year = {Tue Dec 01 00:00:00 EST 2015},
month = {Tue Dec 01 00:00:00 EST 2015}
}