Abstract
In some models of thermal relic dark matter, the relic abundance may be set by inelastic scattering processes (rather than annihilations) becoming inefficient as the universe cools down. This effect has been called coscattering. We present a procedure to numerically solve the full momentum-dependent Boltzmann equations in coscattering, which allows for a precise calculation of the dark matter relic density including the effects of early kinetic decoupling. We apply our method to a simple model, containing a fermionic SU(2) triplet and a fermionic singlet with electroweak-scale masses, at small triplet-singlet mixing. The relic density can be set by either coannihilation or, at values of the mixing angle θ ≲ 10−5, by coscattering. We identify the parameter ranges which give rise to the observed relic abundance. As a special case, we study bino-like dark matter in split supersymmetry at large μ.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
K. Griest and D. Seckel, Three exceptions in the calculation of relic abundances, Phys. Rev.D 43 (1991) 3191 [INSPIRE].
R.T. D’Agnolo, D. Pappadopulo and J.T. Ruderman, Fourth Exception in the Calculation of Relic Abundances, Phys. Rev. Lett.119 (2017) 061102 [arXiv:1705.08450] [INSPIRE].
M. Garny, J. Heisig, B. Lülf and S. Vogl, Coannihilation without chemical equilibrium, Phys. Rev.D 96 (2017) 103521 [arXiv:1705.09292] [INSPIRE].
P. Gondolo and G. Gelmini, Cosmic abundances of stable particles: Improved analysis, Nucl. Phys.B 360 (1991) 145 [INSPIRE].
J. Edsjö and P. Gondolo, Neutralino relic density including coannihilations, Phys. Rev.D 56 (1997) 1879 [hep-ph/9704361] [INSPIRE].
M. Garny, J. Heisig, M. Hufnagel and B. Lülf, Top-philic dark matter within and beyond the WIMP paradigm, Phys. Rev.D 97 (2018) 075002 [arXiv:1802.00814] [INSPIRE].
H.-C. Cheng, L. Li and R. Zheng, Coscattering/Coannihilation Dark Matter in a Fraternal Twin Higgs Model, JHEP09 (2018) 098 [arXiv:1805.12139] [INSPIRE].
S. Junius, L. Lopez-Honorez and A. Mariotti, A feeble window on leptophilic dark matter, JHEP07 (2019) 136 [arXiv:1904.07513] [INSPIRE].
H. Kim and E. Kuflik, Super heavy thermal dark matter, Phys. Rev. Lett.123 (2019) 191801 [arXiv:1906.00981] [INSPIRE].
A. Bharucha, F. Brümmer and R. Ruffault, Well-tempered n-plet dark matter, JHEP09 (2017) 160 [arXiv:1703.00370] [INSPIRE].
A. Bharucha, F. Brümmer and N. Desai, Next-to-minimal dark matter at the LHC, JHEP11 (2018) 195 [arXiv:1804.02357] [INSPIRE].
N. Arkani-Hamed and S. Dimopoulos, Supersymmetric unification without low energy supersymmetry and signatures for fine-tuning at the LHC, JHEP06 (2005) 073 [hep-th/0405159] [INSPIRE].
G.F. Giudice and A. Romanino, Split supersymmetry, Nucl. Phys.B 699 (2004) 65 [Erratum ibid.B 706 (2005) 487] [hep-ph/0406088] [INSPIRE].
M. Duch and B. Grzadkowski, Resonance enhancement of dark matter interactions: the case for early kinetic decoupling and velocity dependent resonance width, JHEP09 (2017) 159 [arXiv:1705.10777] [INSPIRE].
T. Binder, T. Bringmann, M. Gustafsson and A. Hryczuk, Early kinetic decoupling of dark matter: when the standard way of calculating the thermal relic density fails, Phys. Rev.D 96 (2017) 115010 [arXiv:1706.07433] [INSPIRE].
M. Ibe, S. Matsumoto and R. Sato, Mass Splitting between Charged and Neutral Winos at Two-Loop Level, Phys. Lett.B 721 (2013) 252 [arXiv:1212.5989] [INSPIRE].
H. Baer, T. Krupovnickas, A. Mustafayev, E.-K. Park, S. Profumo and X. Tata, Exploring the BWCA (bino-wino co-annihilation) scenario for neutralino dark matter, JHEP12 (2005) 011 [hep-ph/0511034] [INSPIRE].
N. Arkani-Hamed, A. Delgado and G.F. Giudice, The Well-tempered neutralino, Nucl. Phys.B 741 (2006) 108 [hep-ph/0601041] [INSPIRE].
M. Ibe, A. Kamada and S. Matsumoto, Mixed (cold + warm) dark matter in the bino-wino coannihilation scenario, Phys. Rev.D 89 (2014) 123506 [arXiv:1311.2162] [INSPIRE].
K. Harigaya, K. Kaneta and S. Matsumoto, Gaugino coannihilations, Phys. Rev.D 89 (2014) 115021 [arXiv:1403.0715] [INSPIRE].
J. Bramante, N. Desai, P. Fox, A. Martin, B. Ostdiek and T. Plehn, Towards the Final Word on Neutralino Dark Matter, Phys. Rev.D 93 (2016) 063525 [arXiv:1510.03460] [INSPIRE].
T.T. Yanagida, W. Yin and N. Yokozaki, Bino-wino coannihilation as a prediction in the E7unification of families, arXiv:1907.07168 [INSPIRE].
M. Srednicki, R. Watkins and K.A. Olive, Calculations of Relic Densities in the Early Universe, Nucl. Phys.B 310 (1988) 693 [INSPIRE].
G. Bélanger, F. Boudjema, A. Pukhov and A. Semenov, MicrOMEGAs: A Program for calculating the relic density in the MSSM, Comput. Phys. Commun.149 (2002) 103 [hep-ph/0112278] [INSPIRE].
G. Bélanger, F. Boudjema, A. Pukhov and A. Semenov, MicrOMEGAs: Version 1.3, Comput. Phys. Commun.174 (2006) 577 [hep-ph/0405253] [INSPIRE].
A. Belyaev, N.D. Christensen and A. Pukhov, CalcHEP 3.4 for collider physics within and beyond the Standard Model, Comput. Phys. Commun.184 (2013) 1729 [arXiv:1207.6082] [INSPIRE].
Planck collaboration, Planck 2018 results. VI. Cosmological parameters, arXiv:1807.06209 [INSPIRE].
R. Krall and M. Reece, Last Electroweak WIMP Standing: Pseudo-Dirac Higgsino Status and Compact Stars as Future Probes, Chin. Phys.C 42 (2018) 043105 [arXiv:1705.04843] [INSPIRE].
E. Bagnaschi, G.F. Giudice, P. Slavich and A. Strumia, Higgs Mass and Unnatural Supersymmetry, JHEP09 (2014) 092 [arXiv:1407.4081] [INSPIRE].
M. Kawasaki, K. Kohri, T. Moroi and Y. Takaesu, Revisiting Big-Bang Nucleosynthesis Constraints on Long-Lived Decaying Particles, Phys. Rev.D 97 (2018) 023502 [arXiv:1709.01211] [INSPIRE].
C. Han, L. Wu, J.M. Yang, M. Zhang and Y. Zhang, New approach for detecting a compressed bino/wino at the LHC, Phys. Rev.D 91 (2015) 055030 [arXiv:1409.4533] [INSPIRE].
N. Nagata, H. Otono and S. Shirai, Probing Bino-Wino Coannihilation at the LHC, JHEP10 (2015) 086 [arXiv:1506.08206] [INSPIRE].
K. Rolbiecki and K. Sakurai, Long-lived bino and wino in supersymmetry with heavy scalars and higgsinos, JHEP11 (2015) 091 [arXiv:1506.08799] [INSPIRE].
G.H. Duan, K.-I. Hikasa, J. Ren, L. Wu and J.M. Yang, Probing bino-wino coannihilation dark matter below the neutrino floor at the LHC, Phys. Rev.D 98 (2018) 015010 [arXiv:1804.05238] [INSPIRE].
A. Filimonova and S. Westhoff, Long live the Higgs portal!, JHEP02 (2019) 140 [arXiv:1812.04628] [INSPIRE].
ATLAS collaboration, Search for long-lived charginos based on a disappearing-track signature in pp collisions at \( \sqrt{s} \) = 13 TeV with the ATLAS detector, JHEP06 (2018) 022 [arXiv:1712.02118] [INSPIRE].
CMS collaboration, Search for disappearing tracks as a signature of new long-lived particles in proton-proton collisions at \( \sqrt{s} \) = 13 TeV, JHEP08 (2018) 016 [arXiv:1804.07321] [INSPIRE].
ATLAS collaboration, ATLAS sensitivity to winos and higgsinos with a highly compressed mass spectrum at the HL-LHC, ATL-PHYS-PUB-2018-031 (2018).
Open Access
This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited
Author information
Authors and Affiliations
Corresponding author
Additional information
ArXiv ePrint: 1910.01549
Rights and permissions
This article is published under an open access license. Please check the 'Copyright Information' section either on this page or in the PDF for details of this license and what re-use is permitted. If your intended use exceeds what is permitted by the license or if you are unable to locate the licence and re-use information, please contact the Rights and Permissions team.
About this article
Cite this article
Brümmer, F. Coscattering in next-to-minimal dark matter and split supersymmetry. J. High Energ. Phys. 2020, 113 (2020). https://doi.org/10.1007/JHEP01(2020)113
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/JHEP01(2020)113