Aharonian, F.Benkhali, F.A.Aschersleben, J.Ashkar, H.Backes, M.Martins, V.B.Batzofin, R.Becherini, Y.Berge, D.Bernlöhr, K.Bi, B.Böttcher, M.Boisson, C.Bolmont, J.De Lavergne, M.D.B.Borowska, J.Bouyahiaoui, M.Brose, R.Brown, A.Brun, F.et al.2025-05-072025-05-072024Physical Review Letters, 2024; 133(22):221001-1-221001-80031-90071079-7114https://hdl.handle.net/2440/144402Owing to their rapid cooling rate and hence loss-limited propagation distance, cosmic-ray electrons and positrons (CRe) at very high energies probe local cosmic-ray accelerators and provide constraints on exotic production mechanisms such as annihilation of dark matter particles. We present a high-statistics measurement of the spectrum of CRe candidate events from 0.3 to 40 TeV with the High Energy Stereoscopic System, covering 2 orders of magnitude in energy and reaching a proton rejection power of better than 104. The measured spectrum is well described by a broken power law, with a break around 1 TeV, where the spectral index increases from Γ1=3.25±0.02⁢(stat)±0.2⁢(sys) to Γ2=4.49±0.04⁢(stat)±0.2⁢(sys). Apart from the break, the spectrum is featureless. The absence of distinct signatures at multi-TeV energies imposes constraints on the presence of nearby CRe accelerators and the local CRe propagation mechanisms.en© 2024 American Physical SocietyCosmic ray composition & spectra; Cosmic rays & astroparticles; Gamma ray astronomyJournal article10.1103/PhysRevLett.133.221001723119Einecke, S. [0000-0001-9687-8237]