Abstract
We show that a general semi-annihilation scenario, in which a pair of dark matter (DM) particles annihilate to an anti-DM, and an unstable state that can mix with or decay to standard model states, can lead to particle anti-particle asymmetry in the DM sector. The present DM abundance, including the CP-violation in the DM sector and the resulting present asymmetry are determined entirely by a single semi-annihilation process at next-to-leading order. For large CP-violation in this process, we find that a nearly complete asymmetry can be obtained in the DM sector, with the observed DM density being dominated by the (anti-)DM particle. The presence of additional pair-annihilation processes can modify the ratio of DM and anti-DM number densities further, if the pair-annihilation is active subsequent to the decoupling of the semi-annihilation. For such a scenario, the required CP-violation for generating the same present asymmetry is generically much smaller, as compared to the scenario with only semi-annihilation present. We show that a minimal model with a complex scalar DM with cubic self-interactions can give rise to both semi- and pair-annihilations, with the required CP-violation generated at one-loop level. We also find that the upper bound on the DM mass from S-matrix unitarity in the purely asymmetric semi-annihilation scenario, with maximal CP-violation, is around 15 GeV, which is much stronger than in the WIMP and previously considered asymmetric DM cases, due to the required large non-zero chemical potential for such asymmetric DM.
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References
S. Weinberg, Cosmology, Oxford Univ. Pr., Oxford, U.K. (2008).
A.D. Sakharov, Violation of CP invariance, C asymmetry and baryon asymmetry of the universe, Sov. Phys. Usp. 34 (1991) 392 [Pisma Zh. Eksp. Teor. Fiz. 5 (1967) 32] [JETP Lett. 5 (1967) 24] [Usp. Fiz. Nauk 161 (1991) 61] [INSPIRE].
M. Yoshimura, Unified gauge theories and the baryon number of the universe, Phys. Rev. Lett. 41 (1978) 281 [Erratum ibid. 42 (1979) 746] [INSPIRE].
A. Ignatiev, N.V. Krasnikov, V.A. Kuzmin and A.N. Tavkhelidze, Universal CP noninvariant superweak interaction and baryon asymmetry of the universe, Phys. Lett. B 76 (1978) 436 [INSPIRE].
V.A. Kuzmin, V.A. Rubakov and M.E. Shaposhnikov, On the anomalous electroweak baryon number nonconservation in the early universe, Phys. Lett. B 155 (1985) 36 [INSPIRE].
I. Affleck and M. Dine, A new mechanism for baryogenesis, Nucl. Phys. B 249 (1985) 361 [INSPIRE].
S. Weinberg, Cosmological production of baryons, Phys. Rev. Lett. 42 (1979) 850 [INSPIRE].
M. Yoshimura, Origin of cosmological baryon asymmetry, Phys. Lett. B 88 (1979) 294 [INSPIRE].
M. Fukugita and T. Yanagida, Baryogenesis without grand unification, Phys. Lett. B 174 (1986) 45 [INSPIRE].
S. Nussinov, Technocosmology: could a technibaryon excess provide a ‘natural’ missing mass candidate?, Phys. Lett. B 165 (1985) 55 [INSPIRE].
K. Petraki and R.R. Volkas, Review of asymmetric dark matter, Int. J. Mod. Phys. A 28 (2013) 1330028 [arXiv:1305.4939] [INSPIRE].
K.M. Zurek, Asymmetric dark matter: theories, signatures, and constraints, Phys. Rept. 537 (2014) 91 [arXiv:1308.0338] [INSPIRE].
D.B. Kaplan, A single explanation for both the baryon and dark matter densities, Phys. Rev. Lett. 68 (1992) 741 [INSPIRE].
D.E. Kaplan, M.A. Luty and K.M. Zurek, Asymmetric dark matter, Phys. Rev. D 79 (2009) 115016 [arXiv:0901.4117] [INSPIRE].
M.R. Buckley and L. Randall, Xogenesis, JHEP 09 (2011) 009 [arXiv:1009.0270] [INSPIRE].
J. Shelton and K.M. Zurek, Darkogenesis: a baryon asymmetry from the dark matter sector, Phys. Rev. D 82 (2010) 123512 [arXiv:1008.1997] [INSPIRE].
M. Ibe, S. Matsumoto and T.T. Yanagida, The GeV-scale dark matter with B-L asymmetry, Phys. Lett. B 708 (2012) 112 [arXiv:1110.5452] [INSPIRE].
A. Falkowski, J.T. Ruderman and T. Volansky, Asymmetric dark matter from leptogenesis, JHEP 05 (2011) 106 [arXiv:1101.4936] [INSPIRE].
J. March-Russell and M. McCullough, Asymmetric dark matter via spontaneous co-genesis, JCAP 03 (2012) 019 [arXiv:1106.4319] [INSPIRE].
B. Bhattacherjee, S. Matsumoto, S. Mukhopadhyay and M.M. Nojiri, Phenomenology of light fermionic asymmetric dark matter, JHEP 10 (2013) 032 [arXiv:1306.5878] [INSPIRE].
H. Fukuda, S. Matsumoto and S. Mukhopadhyay, Asymmetric dark matter in early universe chemical equilibrium always leads to an antineutrino signal, Phys. Rev. D 92 (2015) 013008 [arXiv:1411.4014] [INSPIRE].
F. D’Eramo and J. Thaler, Semi-annihilation of dark matter, JHEP 06 (2010) 109 [arXiv:1003.5912] [INSPIRE].
L. Bento and Z. Berezhiani, Leptogenesis via collisions: the lepton number leaking to the hidden sector, Phys. Rev. Lett. 87 (2001) 231304 [hep-ph/0107281] [INSPIRE].
E. Nardi, J. Racker and E. Roulet, CP violation in scatterings, three body processes and the Boltzmann equations for leptogenesis, JHEP 09 (2007) 090 [arXiv:0707.0378] [INSPIRE].
P.-H. Gu and U. Sarkar, Annihilating leptogenesis, Phys. Lett. B 679 (2009) 118 [arXiv:0903.3473] [INSPIRE].
Y. Cui, L. Randall and B. Shuve, A WIMPy baryogenesis miracle, JHEP 04 (2012) 075 [arXiv:1112.2704] [INSPIRE].
N. Bernal, F.-X. Josse-Michaux and L. Ubaldi, Phenomenology of WIMPy baryogenesis models, JCAP 01 (2013) 034 [arXiv:1210.0094] [INSPIRE].
N. Bernal, S. Colucci, F.-X. Josse-Michaux, J. Racker and L. Ubaldi, On baryogenesis from dark matter annihilation, JCAP 10 (2013) 035 [arXiv:1307.6878] [INSPIRE].
J. Kumar and P. Stengel, WIMPy leptogenesis with absorptive final state interactions, Phys. Rev. D 89 (2014) 055016 [arXiv:1309.1145] [INSPIRE].
R.J. Scherrer and M.S. Turner, On the relic, cosmic abundance of stable weakly interacting massive particles, Phys. Rev. D 33 (1986) 1585 [Erratum ibid. 34 (1986) 3263] [INSPIRE].
K. Griest and D. Seckel, Cosmic asymmetry, neutrinos and the sun, Nucl. Phys. B 283 (1987) 681 [Erratum ibid. 296 (1988) 1034] [INSPIRE].
M.L. Graesser, I.M. Shoemaker and L. Vecchi, Asymmetric WIMP dark matter, JHEP 10 (2011) 110 [arXiv:1103.2771] [INSPIRE].
H. Iminniyaz, M. Drees and X. Chen, Relic abundance of asymmetric dark matter, JCAP 07 (2011) 003 [arXiv:1104.5548] [INSPIRE].
T. Lin, H.-B. Yu and K.M. Zurek, On symmetric and asymmetric light dark matter, Phys. Rev. D 85 (2012) 063503 [arXiv:1111.0293] [INSPIRE].
I. Baldes, N.F. Bell, K. Petraki and R.R. Volkas, Particle-antiparticle asymmetries from annihilations, Phys. Rev. Lett. 113 (2014) 181601 [arXiv:1407.4566] [INSPIRE].
I. Baldes, N.F. Bell, A.J. Millar and R.R. Volkas, Asymmetric dark matter and CP-violating scatterings in a UV complete model, JCAP 10 (2015) 048 [arXiv:1506.07521] [INSPIRE].
S. Dodelson, Modern cosmology, Academic Pr., Amsterdam, The Netherlands (2003).
S. Weinberg, The quantum theory of fields. Volume 1: foundations, Cambridge University Press, Cambridge, U.K. (1995).
Planck collaboration, Planck 2018 results. VI. Cosmological parameters, arXiv:1807.06209 [INSPIRE].
K. Griest and M. Kamionkowski, Unitarity limits on the mass and radius of dark matter particles, Phys. Rev. Lett. 64 (1990) 615 [INSPIRE].
L. Hui, Unitarity bounds and the cuspy halo problem, Phys. Rev. Lett. 86 (2001) 3467 [astro-ph/0102349] [INSPIRE].
I. Baldes and K. Petraki, Asymmetric thermal-relic dark matter: Sommerfeld-enhanced freeze-out, annihilation signals and unitarity bounds, JCAP 09 (2017) 028 [arXiv:1703.00478] [INSPIRE].
E.W. Kolb and M.S. Turner, The early universe, Front. Phys. 69 (1990) 1 [INSPIRE].
G. Bélanger, K. Kannike, A. Pukhov and M. Raidal, Impact of semi-annihilations on dark matter phenomenology — an example of ZN symmetric scalar dark matter, JCAP 04 (2012) 010 [arXiv:1202.2962] [INSPIRE].
G. Bélanger, K. Kannike, A. Pukhov and M. Raidal, Z3 scalar singlet dark matter, JCAP 01 (2013) 022 [arXiv:1211.1014] [INSPIRE].
Y. Hochberg, E. Kuflik, T. Volansky and J.G. Wacker, Mechanism for thermal relic dark matter of strongly interacting massive particles, Phys. Rev. Lett. 113 (2014) 171301 [arXiv:1402.5143] [INSPIRE].
N. Bernal, C. Garcia-Cely and R. Rosenfeld, WIMP and SIMP dark matter from the spontaneous breaking of a global group, JCAP 04 (2015) 012 [arXiv:1501.01973] [INSPIRE].
A. Hektor, A. Hryczuk and K. Kannike, Improved bounds on Z3 singlet dark matter, JHEP 03 (2019) 204 [arXiv:1901.08074] [INSPIRE].
S.-M. Choi and H.M. Lee, SIMP dark matter with gauged Z3 symmetry, JHEP 09 (2015) 063 [arXiv:1505.00960] [INSPIRE].
S.-M. Choi, Y.-J. Kang and H.M. Lee, On thermal production of self-interacting dark matter, JHEP 12 (2016) 099 [arXiv:1610.04748] [INSPIRE].
A. Ghosh, D. Ghosh and S. Mukhopadhyay, Asymmetric scalar dark matter from semi-annihilation: a comprehensive study, in preparation.
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Ghosh, A., Ghosh, D. & Mukhopadhyay, S. Asymmetric dark matter from semi-annihilation. J. High Energ. Phys. 2020, 149 (2020). https://doi.org/10.1007/JHEP08(2020)149
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DOI: https://doi.org/10.1007/JHEP08(2020)149