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Publication# Combined measurements of Higgs boson couplings in proton–proton collisions at $\sqrt{s}=13\,\text {Te}\text {V} $

Qian Wang, Lesya Shchutska, Matthias Wolf, Konstantin Androsov, Alexis Kalogeropoulos, Jan Steggemann, Yi Wang, Michele Bianco, Jian Wang, Matthias Finger, Mingkui Wang, Zhirui Xu, Zheng Wang, Chao 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, Csaba Hajdu, Joao Varela, 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, Zhen Liu, Jing Li, Ali Harb, Hui Wang, Benjamin William Allen, Pratyush Das, Xin Chen, Miao Hu, Lei Li

2019

Journal paper

2019

Journal paper

Abstract

Combined measurements of the production and decay rates of the Higgs boson, as well as its couplings to vector bosons and fermions, are presented. The analysis uses the LHC proton–proton collision data set recorded with the CMS detector in 2016 at $\sqrt{s}=13\,\text {Te}\text {V}$ , corresponding to an integrated luminosity of 35.9 ${\,\text {fb}^{-1}}$ . The combination is based on analyses targeting the five main Higgs boson production mechanisms (gluon fusion, vector boson fusion, and associated production with a $\mathrm {W}$ or $\mathrm {Z}$ boson, or a top quark-antiquark pair) and the following decay modes: $\mathrm {H} \rightarrow \gamma \gamma$ , $\mathrm {Z}\mathrm {Z}$ , $\mathrm {W}\mathrm {W}$ , $\mathrm {\tau }\mathrm {\tau }$ , $\mathrm {b} \mathrm {b}$ , and $\mathrm {\mu }\mathrm {\mu }$ . Searches for invisible Higgs boson decays are also considered. The best-fit ratio of the signal yield to the standard model expectation is measured to be $\mu =1.17\pm 0.10$ , assuming a Higgs boson mass of $125.09\,\text {Ge}\text {V}$ . Additional results are given for various assumptions on the scaling behavior of the production and decay modes, including generic parametrizations based on ratios of cross sections and branching fractions or couplings. The results are compatible with the standard model predictions in all parametrizations considered. In addition, constraints are placed on various two Higgs doublet models.

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Luminosity

Luminosity is an absolute measure of radiated electromagnetic power (light), the radiant power emitted by a light-emitting object over time. In astronomy, luminosity is the total amount of electromagnetic energy emitted per unit of time by a star, galaxy, or other astronomical objects. In SI units, luminosity is measured in joules per second, or watts. In astronomy, values for luminosity are often given in the terms of the luminosity of the Sun, L⊙.

Standard Model

The Standard Model of particle physics is the theory describing three of the four known fundamental forces (electromagnetic, weak and strong interactions – excluding gravity) in the universe and classifying all known elementary particles. It was developed in stages throughout the latter half of the 20th century, through the work of many scientists worldwide, with the current formulation being finalized in the mid-1970s upon experimental confirmation of the existence of quarks.

Higgs boson

The Higgs boson, sometimes called the Higgs particle, is an elementary particle in the Standard Model of particle physics produced by the quantum excitation of the Higgs field, one of the fields in particle physics theory. In the Standard Model, the Higgs particle is a massive scalar boson with zero spin, even (positive) parity, no electric charge, and no colour charge that couples to (interacts with) mass. It is also very unstable, decaying into other particles almost immediately upon generation.

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Lesya Shchutska, Qian Wang, Matthias Wolf, Konstantin Androsov, Alexis Kalogeropoulos, Jan Steggemann, Yi Wang, Roberto Castello, Alessandro Degano, Michele Bianco, Jian Wang, Matthias Finger, Mingkui Wang, Zhirui Xu, Zheng Wang, Chao 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, David Vannerom, Kun Shi, Wei Shi, 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, Hao Liu, Meng Xiao, Viktor Khristenko, Marco Trovato, Gurpreet Singh, Fan Xia, Bibhuprasad Mahakud, Kai Yi, Muhammad Waqas, Shuai Liu, Seungkyu Ha, Davide Cieri, Maren Tabea Meinhard, Zhen Liu, Jing Li, Ali Harb, Hui Wang, Benjamin William Allen, Pratyush Das, Xin Chen, Miao Hu, Amr Mohamed, Wenjing Wu

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A search for new physics in events with a Z boson produced in association with large missing transverse momentum at the LHC is presented. The search is based on the 2016 data sample of proton-proton c

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