| Article | |
| Report number | arXiv:2108.04195 ; CERN-EP-2021-164 |
| Title | Improved exclusion limit for light dark matter from $e^+e^-$ annihilation in NA64 |
| Author(s) | Andreev, Yu.M. (Moscow, INR) ; Banerjee, D. (CERN) ; Bernhard, J. (CERN) ; Bondi, M. (INFN, Genoa) ; Burtsev, V.E. (Dubna, JINR) ; Celentano, A. (INFN, Genoa) ; Charitonidis, N. (CERN) ; Chumakov, A.G. (Tomsk Polytechnic U. ; Tomsk Pedagogical Inst.) ; Cooke, D. (U. Coll. London) ; Crivelli, P. (Zurich, ETH) ; Depero, E. (Zurich, ETH) ; Dermenev, A.V. (Moscow, INR) ; Donskov, S.V. (Kurchatov Inst., Moscow) ; Dusaev, R.R. (Tomsk Polytechnic U.) ; Enik, T. (Dubna, JINR) ; Feshchenko, A. (Dubna, JINR) ; Frolov, V.N. (Dubna, JINR) ; Gardikiotis, A. (Patras U.) ; Gerassimov, S.G. (Munich, Tech. U. ; Lebedev Inst.) ; Gninenko, S.N. (Moscow, INR) ; Hösgen, M. (Bonn U., ITKP) ; Jeckel, M. (CERN) ; Kachanov, V.A. (Kurchatov Inst., Moscow) ; Karneyeu, A.E. (Moscow, INR) ; Kekelidze, G. (Dubna, JINR) ; Ketzer, B. (Bonn U., ITKP) ; Kirpichnikov, D.V. (Moscow, INR) ; Kirsanov, M.M. (Moscow, INR) ; Kolosov, V.N. (Kurchatov Inst., Moscow) ; Konorov, I.V. (Munich, Tech. U. ; Lebedev Inst.) ; Kovalenko, S.G. (Andres Bello Natl. U. ; Millenium Inst. Astro., Santiago) ; Kramarenko, V.A. (Dubna, JINR ; SINP, Moscow) ; Kravchuk, L.V. (Moscow, INR) ; Krasnikov, N.V. (Dubna, JINR ; Moscow, INR) ; Kuleshov, S.V. (Andres Bello Natl. U. ; Millenium Inst. Astro., Santiago) ; Lyubovitskij, V.E. (Tomsk Polytechnic U. ; Tomsk Pedagogical Inst. ; Santa Maria U., Valparaiso ; Millenium Inst. Astro., Santiago) ; Lysan, V. (Dubna, JINR) ; Marsicano, L. (INFN, Genoa) ; Matveev, V.A. (Dubna, JINR) ; Mikhailov, Yu.V. (Kurchatov Inst., Moscow) ; Bueno, L. Molina (Zurich, ETH ; Valencia U., IFIC) ; Peshekhonov, D.V. (Dubna, JINR) ; Polyakov, V.A. (Kurchatov Inst., Moscow) ; Radics, B. (Zurich, ETH) ; Rojas, R. (Santa Maria U., Valparaiso) ; Rubbia, A. (Zurich, ETH) ; Samoylenko, V.D. (Kurchatov Inst., Moscow) ; Sieber, H. (Zurich, ETH) ; Shchukin, D. (Lebedev Inst.) ; Tikhomirov, V.O. (Lebedev Inst.) ; Tlisova, I. (Moscow, INR) ; Toropin, A.N. (Moscow, INR) ; Trifonov, A.Yu. (Tomsk Polytechnic U. ; Tomsk Pedagogical Inst.) ; Ulloa, P. (Andres Bello Natl. U.) ; Vasilishin, B.I. (Tomsk Polytechnic U.) ; Vasquez Arenas, G. (Santa Maria U., Valparaiso) ; Volkov, P.V. (Dubna, JINR ; SINP, Moscow) ; Volkov, V.Yu. (SINP, Moscow) |
| Publication | 2021-11-01 |
| Imprint | 2021-08-09 |
| Number of pages | 7 |
| Note | Version accepted for publication as a Letter in Phys. Rev. D |
| In: | Phys. Rev. D 104 (2021) L091701 |
| DOI | 10.1103/PhysRevD.104.L091701 (publication) |
| Subject category | hep-ph ; Particle Physics - Phenomenology ; hep-ex ; Particle Physics - Experiment |
| Abstract | The current most stringent constraints for the existence of sub-GeV dark matter coupling to Standard Model via a massive vector boson $A^\prime$ were set by the NA64 experiment for the mass region $m_{A^\prime}\lesssim 250$ MeV, by analyzing data from the interaction of $2.84\cdot10^{11}$ 100-GeV electrons with an active thick target and searching for missing-energy events. In this work, by including $A^\prime$ production via secondary positron annihilation with atomic electrons, we extend these limits in the $200$-$300$ MeV region by almost an order of magnitude, touching for the first time the dark matter relic density constrained parameter combinations. Our new results demonstrate the power of the resonant annihilation process in missing energy dark-matter searches, paving the road to future dedicated $e^+$ beam efforts. |
| Copyright/License | preprint: (License: arXiv nonexclusive-distrib 1.0) publication: Published by the American Physical Society |
Corresponding record in: Inspire
レコード 生成： 2021-08-12, 最終変更： 2023-11-24