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Search for leptophobic Z′ bosons decaying into four-lepton final states in proton–proton collisions at $\sqrt s$ =8TeV

Muhammad Ahmad, Benjamin William Allen, Georgios Anagnostou, Konstantin Androsov, Alexandre Aubin, Roberto Castello, Juan Ramon Castiñeiras De Saa, Yixing Chen, Tian Cheng, Davide Cieri, Giuseppe Codispoti, Alessandro Degano, Charles Dietz, Milos Dordevic, Dipanwita Dutta, Matthias Finger, Francesco Fiori, Daniel Gonzalez, Seungkyu Ha, Csaba Hajdu, Peter Hansen, Ali Harb, Alexis Kalogeropoulos, Viktor Khristenko, Ji Hyun Kim, Donghyun Kim, Vineet Kumar, Ajay Kumar, Sanjeev Kumar, Ekaterina Kuznetsova, Wei Li, Ho Ling Li, Shuai Liu, Zhen Liu, Hao Liu, Werner Lustermann, Bibhuprasad Mahakud, Maren Tabea Meinhard, Thomas Muller, Ioannis Papadopoulos, Vladimir Petrov, Quentin Python, Andrea Rizzi, Paolo Ronchese, Sourav Sen, Varun Sharma, Ashish Sharma, Lesya Shchutska, Muhammad Shoaib, Gurpreet Singh, Jan Steggemann, Xin Sun, Marco Trovato, Andromachi Tsirou, Paul Turner, Joao Varela, Yi Wang, Zheng Wang, Siyuan Wang, Jian Wang, Mingkui Wang, Qian Wang, Hui Wang, Rui Wang, Muhammad Waqas, Matthias Weber, Matthias Wolf, Fan Xia, Meng Xiao, Zhirui Xu, Yong Yang, Kai Yi
2017
Article

Résumé

A search for heavy narrow resonances decaying into four-lepton final states has been performed using proton–proton collision data at s=8TeV collected by the CMS experiment, corresponding to an integrated luminosity of 19.7 fb−1 . No excess of events over the standard model background expectation is observed. Upper limits for a benchmark model on the product of cross section and branching fraction for the production of these heavy narrow resonances are presented. The limit excludes leptophobic Z′ bosons with masses below 2.5 TeV within the benchmark model. This is the first result to constrain a leptophobic Z′ resonance in the four-lepton channel.

Official source

https://infoscience.epfl.ch/record/274950?ln=fr

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Search for heavy gauge W' boson in events with an energetic lepton and large missing transverse momentum at $ \sqrt{s} = $ 13 TeV

A search is presented for W′ bosons in events with an electron or muon and large missing transverse momentum, using proton–proton collision data at s=13 TeV collected with the CMS detector in 2015 and corresponding to an integrated luminosity of 2.3 fb−1 . No evidence of an excess of events relative to the standard model expectations is observed. For a W′ boson described by the sequential standard model, upper limits at 95% confidence level are set on the product of the production cross section and branching fraction and lower limits are established on the new boson mass. Masses below 4.1 TeV are excluded combining electron and muon decay channels, significantly improving upon the results obtained with the 8 TeV data. Exclusion limits at 95% confidence level on the product of the W′ production cross section and branching fraction are also derived in combination with the 8 TeV data. Finally, exclusion limits are set for the production of generic W′ bosons decaying into this final state using a model-independent approach.

2017

Chargement

Search for massive WH resonances decaying into the $\ell \nu \mathrm{b} \overline{\mathrm{b}} $ final state at $\sqrt{s}=8$ $~\text {TeV}$

Muhammad Ahmad, Georgios Anagnostou, Konstantin Androsov, Alexandre Aubin, Roberto Castello, Juan Ramon Castiñeiras De Saa, Yixing Chen, Tian Cheng, Davide Cieri, Giuseppe Codispoti, Alessandro Degano, Charles Dietz, Milos Dordevic, Dipanwita Dutta, Matthias Finger, Francesco Fiori, Daniel Gonzalez, Ruchi Gupta, Csaba Hajdu, Peter Hansen, Alexis Kalogeropoulos, Viktor Khristenko, Ji Hyun Kim, Donghyun Kim, Vineet Kumar, Ajay Kumar, Sanjeev Kumar, Ekaterina Kuznetsova, Wei Li, Ho Ling Li, Shuai Liu, Hao Liu, Werner Lustermann, Bibhuprasad Mahakud, Matteo Marone, Thomas Muller, Ioannis Papadopoulos, Vladimir Petrov, Quentin Python, Andrea Rizzi, Paolo Ronchese, Sourav Sen, Varun Sharma, Ashish Sharma, Lesya Shchutska, Muhammad Shoaib, Michal Simon, Gurpreet Singh, Jan Steggemann, Wei Sun, Xin Sun, Marco Trovato, Andromachi Tsirou, Paul Turner, Joao Varela, Qian Wang, Jian Wang, Mingkui Wang, Rui Wang, Yi Wang, Zheng Wang, Siyuan Wang, Matthias Weber, Matthias Wolf, Fan Xia, Meng Xiao, Zhirui Xu, Yong Yang, Fan Yang, Kai Yi

A search for a massive resonance

{\mathrm{W}^{\prime }}

decaying into a W and a Higgs boson in the

\ell \nu \mathrm{b} \overline{\mathrm{b}}

(

\ell = \mathrm {e}

\mu

) final state is presented. Results are based on data corresponding to an integrated luminosity of 19.7

\,\text {fb}^{{-1}}

of proton–proton collisions at

\sqrt{s}=8

~\text {TeV}

, collected using the CMS detector at the LHC. For a high-mass (

\gtrsim

~\text {TeV}

) resonance, the two bottom quarks coming from the Higgs boson decay are reconstructed as a single jet, which can be tagged by placing requirements on its substructure and flavour. Exclusion limits at 95 % confidence level are set on the production cross section of a narrow resonance decaying into WH, as a function of its mass. In the context of a little Higgs model, a lower limit on the

{\mathrm{W}^{\prime }}

mass of 1.4

~\text {TeV}

is set. In a heavy vector triplet model that mimics the properties of composite Higgs models, a lower limit on the

{\mathrm{W}^{\prime }}

mass of 1.5

~\text {TeV}

is set. In the context of this model, the results are combined with related searches to obtain a lower limit on the

{\mathrm{W}^{\prime }}

mass of 1.8

~\text {TeV}

, the most restrictive to date for decays to a pair of standard model bosons.

2016

Chargement

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

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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

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, 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}

\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.

Springer2019

Chargement

Afficher plus

Search for massive WH resonances decaying into the $\ell \nu \mathrm{b} \overline{\mathrm{b}} $ final state at $\sqrt{s}=8$ $~\text {TeV}$

A search for a massive resonance

{\mathrm{W}^{\prime }}

decaying into a W and a Higgs boson in the

\ell \nu \mathrm{b} \overline{\mathrm{b}}

(

\ell = \mathrm {e}

\mu

) final state is presented. Results are based on data corresponding to an integrated luminosity of 19.7

\,\text {fb}^{{-1}}

of proton–proton collisions at

\sqrt{s}=8

~\text {TeV}

, collected using the CMS detector at the LHC. For a high-mass (

\gtrsim

~\text {TeV}

{\mathrm{W}^{\prime }}

mass of 1.4

~\text {TeV}

is set. In a heavy vector triplet model that mimics the properties of composite Higgs models, a lower limit on the

{\mathrm{W}^{\prime }}

mass of 1.5

~\text {TeV}

is set. In the context of this model, the results are combined with related searches to obtain a lower limit on the

{\mathrm{W}^{\prime }}

mass of 1.8

~\text {TeV}

, the most restrictive to date for decays to a pair of standard model bosons.

2016

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

\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}

\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}

Springer2019