This article presents a model-independent search for an additional, mostly sterile, heavy neutral lepton (HNL), that is capable of mixing with the Standard Model τ neutrino with a mixing strength of |Uτ4|2, corresponding to the absolute square of the extended Pontecorvo-Maki-Nakagawa-Sakata matrix element. Data from the BABAR experiment, with a total integrated luminosity of 424 fb-1, are analyzed using a kinematic approach that makes no assumptions on the model behind the origins of the HNL, its lifetime or decay modes. No significant signal is found. Upper limits on |Uτ4|2 at the 95% confidence level, depend on the HNL mass hypothesis and vary from 2.31×10-2 to 5.04×10-6 (with all uncertainties considered), across the mass range 100<1300 MeV/c2; the more stringent limits being placed at higher masses.

Search for heavy neutral leptons using tau lepton decays at BaBar / Lees, J.P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D.N., Kolomensky, Y.G., Fritsch, M., Koch, H., Cheaib, R., Hearty, C., Mattison, T.S., Mckenna, J.A., So, R.Y., Blinov, V.E., Buzykaev, A.R., Druzhinin, V.P., Kozyrev, E.A., Kravchenko, E.A., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 107:5(2023). [10.1103/PhysRevD.107.052009]

Search for heavy neutral leptons using tau lepton decays at BaBar

De Nardo G.;
2023

Abstract

This article presents a model-independent search for an additional, mostly sterile, heavy neutral lepton (HNL), that is capable of mixing with the Standard Model τ neutrino with a mixing strength of |Uτ4|2, corresponding to the absolute square of the extended Pontecorvo-Maki-Nakagawa-Sakata matrix element. Data from the BABAR experiment, with a total integrated luminosity of 424 fb-1, are analyzed using a kinematic approach that makes no assumptions on the model behind the origins of the HNL, its lifetime or decay modes. No significant signal is found. Upper limits on |Uτ4|2 at the 95% confidence level, depend on the HNL mass hypothesis and vary from 2.31×10-2 to 5.04×10-6 (with all uncertainties considered), across the mass range 100<1300 MeV/c2; the more stringent limits being placed at higher masses.
2023
Search for heavy neutral leptons using tau lepton decays at BaBar / Lees, J.P., Poireau, V., Tisserand, V., Grauges, E., Palano, A., Eigen, G., Brown, D.N., Kolomensky, Y.G., Fritsch, M., Koch, H., Cheaib, R., Hearty, C., Mattison, T.S., Mckenna, J.A., So, R.Y., Blinov, V.E., Buzykaev, A.R., Druzhinin, V.P., Kozyrev, E.A., Kravchenko, E.A., et al.. - In: PHYSICAL REVIEW D. - ISSN 2470-0010. - 107:5(2023). [10.1103/PhysRevD.107.052009]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/938440
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