TY - JOUR

T1 - Decoding dark matter at future e+e- colliders

AU - Belyaev, Alexander

AU - Freegard, Arran

AU - Ginzburg, Ilya F.

AU - Locke, Daniel

AU - Pukhov, Alexander

N1 - Funding Information: This work was supported in part by Grants RFBR and NSh-3802.2012.2, Program of Dept. of Phys. Sc. RAS and SB RAS “Studies of Higgs boson and exotic particles at LHC” and Polish Ministry of Science and Higher Education Grant N202 230337. I. G. is thankful to A. Bondar, E. Boos, A. Gladyshev, A. Grozin, S. Eidelman, I. Ivanov, D. Ivanov, D. Kazakov, J. Kalinowski, K. Kanishev, P. Krachkov, and V. Serbo for discussions. We would like to thank Tristan Hosken for his contribution on the very early stage of this study. We acknowledge the use of the IRIDIS High Performance Computing Facility, and associated support services at the University of Southampton to complete this work. A. B. and D. L. acknowledge support from the STFC Grant No. ST/L000296/1 and Soton-FAPESP grant. The work of A. P. was carried out within the scientific program “Particle Physics and Cosmology” of the Russian National Center for Physics and Mathematics. Publisher Copyright: © 2022 authors. Published by the American Physical Society.

PY - 2022/7/1

Y1 - 2022/7/1

N2 - We explore the potential of the e+e- colliders to discover dark matter and determine its properties such as mass and spin. For this purpose we study spin zero and spin one-half cases of dark matter D, which belongs to the SU(2) weak doublet and therefore has the charged doublet partner D+. For the case of scalar dark matter we chose inert doublet model, while for the case of fermion dark matter we suggest the new minimal fermion dark matter model with only three parameters. We choose two benchmarks for the models under study, which provide the correct amount of observed dark matter (DM) relic density and consistent with the current DM searches. We focus on the particular process e+e-→D+D-→DDW+W-→DD(qq¯)(μ±ν) at the 500 GeV ILC collider that gives rise to the "dijet+μ+ET"signature and study it at the level of fast detector simulation, taking into account bremsstrahlung and ISR effects. We have found that two kinematical observables - the energy of the muon Eμ and the angular distribution of the W boson, reconstructed from dijet cosθjj are very powerful in determination of DM mass and spin, respectively. In particular we have demonstrated that in the case of fermion DM, the masses can be measured with a few percent accuracy already at 500 fb-1 integrated luminosity. At the same time, the scalar DM model which has about an order of magnitude lower signal, requires about a factor of 40 higher luminosity to reach the same accuracy in the mass measurement. We have found that one can distinguish fermion and scalar DM scenarios with about 2 ab-1 total integrated luminosity or less without using the information on the cross sections for benchmarks under study. The methods of the determination of DM properties which we suggest here are generic for the models where DM and its partner belong to the weak multiplet and can be applied to explore various DM models at future e+e- colliders.

AB - We explore the potential of the e+e- colliders to discover dark matter and determine its properties such as mass and spin. For this purpose we study spin zero and spin one-half cases of dark matter D, which belongs to the SU(2) weak doublet and therefore has the charged doublet partner D+. For the case of scalar dark matter we chose inert doublet model, while for the case of fermion dark matter we suggest the new minimal fermion dark matter model with only three parameters. We choose two benchmarks for the models under study, which provide the correct amount of observed dark matter (DM) relic density and consistent with the current DM searches. We focus on the particular process e+e-→D+D-→DDW+W-→DD(qq¯)(μ±ν) at the 500 GeV ILC collider that gives rise to the "dijet+μ+ET"signature and study it at the level of fast detector simulation, taking into account bremsstrahlung and ISR effects. We have found that two kinematical observables - the energy of the muon Eμ and the angular distribution of the W boson, reconstructed from dijet cosθjj are very powerful in determination of DM mass and spin, respectively. In particular we have demonstrated that in the case of fermion DM, the masses can be measured with a few percent accuracy already at 500 fb-1 integrated luminosity. At the same time, the scalar DM model which has about an order of magnitude lower signal, requires about a factor of 40 higher luminosity to reach the same accuracy in the mass measurement. We have found that one can distinguish fermion and scalar DM scenarios with about 2 ab-1 total integrated luminosity or less without using the information on the cross sections for benchmarks under study. The methods of the determination of DM properties which we suggest here are generic for the models where DM and its partner belong to the weak multiplet and can be applied to explore various DM models at future e+e- colliders.

UR - http://www.scopus.com/inward/record.url?scp=85135958144&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.106.015016

DO - 10.1103/PhysRevD.106.015016

M3 - Article

AN - SCOPUS:85135958144

VL - 106

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 1

M1 - 015016

ER -