Journal article
Search for a heavy neutral lepton that mixes predominantly with the tau neutrino
M Nayak, S Dey, A Soffer, I Adachi, H Aihara, S Al Said, DM Asner, H Atmacan, R Ayad, V Babu, S Banerjee, M Bauer, P Behera, K Belous, M Bessner, V Bhardwaj, B Bhuyan, T Bilka, D Biswas, A Bobrov Show all
Physical Review D | Published : 2024
Abstract
We report a search for a heavy neutral lepton (HNL) that mixes predominantly with ντ. The search utilizes data collected with the Belle detector at the KEKB asymmetric energy e+e- collider. The data sample was collected at and just below the center-of-mass energies of the (4S) and (5S) resonances and has an integrated luminosity of 915 fb-1, corresponding to (836±12)×106 e+e-→τ+τ- events. We search for production of the HNL (denoted N) in the decay τ-→π-N followed by its decay via N→μ+μ-ντ. The search focuses on the parameter-space region in which the HNL is long-lived, so that the μ+μ- originate from a common vertex that is significantly displaced from the collision point of the KEKB beams...
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