Search for heavy neutral leptons using tau lepton decays at BaBaR

Lees, JP and Poireau, V and Tisserand, V and Grauges, E and Palano, A and Eigen, G and Brown, DN and Kolomensky, YG and Fritsch, M and Koch, H and Cheaib, R and Hearty, C and Mattison, TS and McKenna, JA and So, RY and Blinov, VE and Buzykaev, AR and Druzhinin, VP and Kozyrev, EA and Kravchenko, EA and Serednyakov, SI and Skovpen, YI and Solodov, EP and Todyshev, KY and Lankford, AJ and Dey, B and Gary, JW and Long, O and Eisner, AM and Lockman, WS and Panduro Vazquez, W and Chao, DS and Cheng, CH and Echenard, B and Flood, KT and Hitlin, DG and Li, Y and Lin, DX and Middleton, S and Miyashita, TS and Ongmongkolkul, P and Oyang, J and Porter, FC and Röhrken, M and Meadows, BT and Sokoloff, MD and Smith, JG and Wagner, SR and Bernard, D and Verderi, M and Bettoni, D and Bozzi, C and Calabrese, R and Cibinetto, G and Fioravanti, E and Garzia, I and Luppi, E and Santoro, V and Calcaterra, A and De Sangro, R and Finocchiaro, G and Martellotti, S and Patteri, P and Peruzzi, IM and Piccolo, M and Rotondo, M and Zallo, A and Passaggio, S and Patrignani, C and Shuve, BJ and Lacker, HM and Bhuyan, B and Mallik, U and Chen, C and Cochran, J and Prell, S and Gritsan, AV and Arnaud, N and Davier, M and Le Diberder, F and Lutz, AM and Wormser, G and Lange, DJ and Wright, DM and Coleman, JP and Hutchcroft, DE and Payne, DJ and Touramanis, C and Bevan, AJ and Di Lodovico, F and Cowan, G and Banerjee, S and Brown, DN and Davis, CL and Denig, AG and Gradl, W and Griessinger, K and Hafner, A and Schubert, KR and Barlow, RJ (2023) Search for heavy neutral leptons using tau lepton decays at BaBaR. Physical Review D, 107 (5). pp. 1-18. ISSN 2470-0010 DOI: https://doi.org/10.1103/PhysRevD.107.052009

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<m4<1300 MeV/c2; the more stringent limits being placed at higher masses.

Identification Number:	https://doi.org/10.1103/PhysRevD.107.052009
Status:	Published
Refereed:	Yes
Depositing User (symplectic)	Deposited by Campbell, Amy
Date Deposited:	18 Jul 2023 14:45
Last Modified:	29 Aug 2023 10:39
Item Type:	Article