Are you an EPFL student looking for a semester project?
Work with us on data science and visualisation projects, and deploy your project as an app on top of GraphSearch.
A search for events containing four top quarks ( tt¯tt¯ ) is reported from proton–proton collisions recorded by the CMS experiment at s=13 TeV and corresponding to an integrated luminosity of 2.6 fb −1 . The analysis considers the single-lepton (e or μ )+jets and the opposite-sign dilepton ( μ+μ− , μ±e∓ , or e+e− )+jets channels. It uses boosted decision trees to combine information on the global event and jet properties to distinguish between tt¯tt¯ and tt¯ production. The number of events observed after all selection requirements is consistent with expectations from background and standard model signal predictions, and an upper limit is set on the cross section for tt¯tt¯ production in the standard model of 94 fb at 95% confidence level ( 10.2 × the prediction), with an expected limit of 118 fb. This is combined with the results from the published CMS search in the same-sign dilepton channel, resulting in an improved limit of 69 fb at 95% confidence level ( 7.4 × the prediction), with an expected limit of 71 fb. These are the strongest constraints on the rate of tt¯tt¯ production to date.
Qian Wang, Matthias Wolf, Yi Zhang, Konstantin Androsov, Alexis Kalogeropoulos, Jan Steggemann, Yi Wang, Michele Bianco, Jian Wang, Matthias Finger, Zheng Wang, Chao Wang, João Miguel das Neves Duarte, Tagir Aushev, Varun Sharma, Tian Cheng, Yixing Chen, Werner Lustermann, Ioannis Papadopoulos, Andrea Rizzi, Paolo Ronchese, Ekaterina Kuznetsova, Hua Zhang, Siyuan Wang, Jessica Prisciandaro, Peter Hansen, Ruchi Gupta, David Vannerom, Sebastiana Gianì, Kun Shi, Abhisek Datta, Arvind Shah, Wei Shi, Wei Sun, Jian Zhao, Rakesh Chawla, Thomas Berger, Federica Legger, Doohyun Kim, Bertrand François, Bandeep Singh, 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, Vladimir Petrov, Francesco Fiori, Meng Xiao, Sourav Sen, Viktor Khristenko, Kai Yi, Muhammad Waqas, Seungkyu Ha, Maren Tabea Meinhard, Xiao Wang, Zhen Liu, Jing Li, Ali Harb, Hui Wang, Pratyush Das, Miao Hu, Anton Petrov, Chunhui Chen, Valérie Scheurer, Muhammad Ansar Iqbal
Qian Wang, Matthias Wolf, Yi Zhang, Konstantin Androsov, Alexis Kalogeropoulos, Jan Steggemann, Yi Wang, Michele Bianco, Jian Wang, Matthias Finger, Zheng Wang, Chao Wang, João Miguel das Neves Duarte, Tagir Aushev, Varun Sharma, Tian Cheng, Yixing Chen, Werner Lustermann, Ioannis Papadopoulos, Andrea Rizzi, Paolo Ronchese, Ekaterina Kuznetsova, Hua Zhang, Siyuan Wang, Jessica Prisciandaro, Peter Hansen, Ruchi Gupta, David Vannerom, Sebastiana Gianì, Kun Shi, Abhisek Datta, Arvind Shah, Wei Shi, Wei Sun, Jian Zhao, Rakesh Chawla, Thomas Berger, Federica Legger, Doohyun Kim, Bertrand François, Bandeep Singh, Ji Hyun Kim, Dipanwita Dutta, Donghyun Kim, Yiming Li, 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, Vladimir Petrov, Francesco Fiori, Quentin Python, Meng Xiao, Sourav Sen, Viktor Khristenko, Fan Xia, Kai Yi, Muhammad Waqas, Seungkyu Ha, Maren Tabea Meinhard, Xiao Wang, Zhen Liu, Jing Li, Ali Harb, Hui Wang, Benjamin William Allen, Pratyush Das, Miao Hu, Anton Petrov, Chunhui Chen, Valérie Scheurer, Muhammad Ansar Iqbal
Qian Wang, Matthias Wolf, Yi Zhang, Konstantin Androsov, Alexis Kalogeropoulos, Jan Steggemann, Yi Wang, Michele Bianco, Jian Wang, Matthias Finger, Zheng Wang, Chao Wang, João Miguel das Neves Duarte, Tagir Aushev, Varun Sharma, Tian Cheng, Yixing Chen, Werner Lustermann, Ioannis Papadopoulos, Andrea Rizzi, Paolo Ronchese, Ekaterina Kuznetsova, Hua Zhang, Siyuan Wang, Jessica Prisciandaro, Peter Hansen, Ruchi Gupta, David Vannerom, Sebastiana Gianì, Kun Shi, Abhisek Datta, Arvind Shah, Wei Shi, Wei Sun, Jian Zhao, Rakesh Chawla, Thomas Berger, Federica Legger, Doohyun Kim, Bertrand François, Bandeep Singh, Ji Hyun Kim, Dipanwita Dutta, Donghyun Kim, Yiming Li, 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, Vladimir Petrov, Francesco Fiori, Quentin Python, Meng Xiao, Sourav Sen, Viktor Khristenko, Fan Xia, Kai Yi, Muhammad Waqas, Seungkyu Ha, Maren Tabea Meinhard, Xiao Wang, Zhen Liu, Jing Li, Ali Harb, Hui Wang, Benjamin William Allen, Pratyush Das, Miao Hu, Anton Petrov, Chunhui Chen, Valérie Scheurer, Muhammad Ansar Iqbal