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A search for a heavy neutral lepton N of Majorana nature decaying into a W boson and a charged lepton is performed using the CMS detector at the LHC. The targeted signature consists of three prompt charged leptons in any flavor combination of electrons and muons. The data were collected in proton-proton collisions at a center-of-mass energy of 13 TeV, with an integrated luminosity of 35.9 fb-1. The search is performed in the N mass range between 1 GeV and 1.2 TeV. The data are found to be consistent with the expected standard model background. Upper limits are set on the values of |VeN|2 and |VμN|2, where VℓN is the matrix element describing the mixing of N with the standard model neutrino of flavor ℓ. These are the first direct limits for N masses above 500 GeV and the first limits obtained at a hadron collider for N masses below 40 GeV.
Qian Wang, Lesya Shchutska, Matthias Wolf, Konstantin Androsov, Alexis Kalogeropoulos, Jan Steggemann, Yi Wang, Michele Bianco, Jian Wang, Matthias Finger, Mingkui Wang, Zheng Wang, João Miguel das Neves Duarte, Tagir Aushev, Varun Sharma, Tian Cheng, Yixing Chen, Werner Lustermann, Ioannis Papadopoulos, Paolo Ronchese, Andrea Rizzi, Ekaterina Kuznetsova, Thomas Muller, Ho Ling Li, Giuseppe Codispoti, Hua Zhang, Siyuan Wang, Peter Hansen, Daniel Gonzalez, Ruchi Gupta, David Vannerom, Kun Shi, Wei Shi, Abhisek Datta, Thomas Berger, Ji Hyun Kim, Dipanwita Dutta, Donghyun Kim, Sanjeev Kumar, Yong Yang, Ajay Kumar, Andromachi Tsirou, Georgios Anagnostou, Csaba Hajdu, Joao Varela, Muhammad Ahmad, Matthias Weber, Muhammad Shoaib, Milos Dordevic, Vineet Kumar, Abhishek Sharma, Wei Li, Vladimir Petrov, Francesco Fiori, Quentin Python, Meng Xiao, Sourav Sen, Viktor Khristenko, Marco Trovato, Fan Xia, Bibhuprasad Mahakud, Muhammad Waqas, Seungkyu Ha, Davide Cieri, Maren Tabea Meinhard, Xiao Wang, Zhen Liu, Jing Li, Ali Harb, Hui Wang, Benjamin William Allen, Pratyush Das, Xin Chen, Miao Hu, Lei Li, Valérie Scheurer
Lesya Shchutska, Qian Wang, Matthias Wolf, Alexis Kalogeropoulos, Konstantin Androsov, Jan Steggemann, Yi Wang, Michele Bianco, Jian Wang, Matthias Finger, Mingkui Wang, Zheng Wang, João Miguel das Neves Duarte, Tagir Aushev, Varun Sharma, Tian Cheng, Yixing Chen, Werner Lustermann, Ioannis Papadopoulos, Paolo Ronchese, Andrea Rizzi, Ekaterina Kuznetsova, Thomas Muller, Ho Ling Li, Giuseppe Codispoti, Hua Zhang, Siyuan Wang, Peter Hansen, Daniel Gonzalez, Ruchi Gupta, David Vannerom, Kun Shi, Wei Shi, Abhisek Datta, Ji Hyun Kim, Dipanwita Dutta, Donghyun Kim, Sanjeev Kumar, Yong Yang, Ajay Kumar, Andromachi Tsirou, Georgios Anagnostou, Joao Varela, Csaba Hajdu, Muhammad Ahmad, Matthias Weber, Muhammad Shoaib, Milos Dordevic, Vineet Kumar, Abhishek Sharma, Wei Li, Vladimir Petrov, Francesco Fiori, Quentin Python, Hao Liu, Meng Xiao, Sourav Sen, Viktor Khristenko, Marco Trovato, Gurpreet Singh, Fan Xia, Bibhuprasad Mahakud, Muhammad Waqas, Seungkyu Ha, Davide Cieri, Maren Tabea Meinhard, Xiao Wang, Jing Li, Zhen Liu, Ali Harb, Hui Wang, Benjamin William Allen, Pratyush Das, Xin Chen, Miao Hu, Lei Li
Lesya Shchutska, Qian Wang, Matthias Wolf, Yi Zhang, Konstantin Androsov, Alexis Kalogeropoulos, Jan Steggemann, Yi Wang, Michele Bianco, Jian Wang, Matthias Finger, Mingkui Wang, Zheng Wang, João Miguel das Neves Duarte, Tagir Aushev, Varun Sharma, Tian Cheng, Werner Lustermann, Ioannis Papadopoulos, Andrea Rizzi, Paolo Ronchese, Ekaterina Kuznetsova, Thomas Muller, Giuseppe Codispoti, Hua Zhang, Siyuan Wang, Jessica Prisciandaro, Peter Hansen, Daniel Gonzalez, Ruchi Gupta, David Vannerom, Sebastiana Gianì, Kun Shi, Wei Shi, Abhisek Datta, Thomas Berger, Alessandro Caratelli, Ji Hyun Kim, Dipanwita Dutta, Donghyun Kim, Yiming Li, Sanjeev Kumar, Yong Yang, Ajay Kumar, Andromachi Tsirou, Georgios Anagnostou, Joao Varela, Csaba Hajdu, Muhammad Ahmad, Matthias Weber, Muhammad Shoaib, Milos Dordevic, Vineet Kumar, Abhishek Sharma, Wei Li, Vladimir Petrov, Francesco Fiori, Quentin Python, Meng Xiao, Sourav Sen, Viktor Khristenko, Marco Trovato, Fan Xia, Bibhuprasad Mahakud, Muhammad Waqas, Seungkyu Ha, Davide Cieri, Maren Tabea Meinhard, Xiao Wang, Zhen Liu, Jing Li, Ali Harb, Hui Wang, Benjamin William Allen, Pratyush Das, Xin Chen, Miao Hu, Lei Li, Amr Mohamed, Valérie Scheurer