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Combined Measurement of the Higgs Boson Mass in $pp$ Collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS and CMS Experiments

Muhammad Ahmad, Ahmed Ali, Christian Amstutz, Georgios Anagnostou, Konstantin Androsov, Spyridon Argyropoulos, Alexandre Aubin, Nicolas Berger, Michele Bianco, Alexey Boldyrev, Simone Campana, João Carvalho, Roberto Castello, Juan Ramon Castiñeiras De Saa, Matevz Cerv, Susan Cheatham, Chunhui Chen, Xin Chen, Yixing Chen, Liming Chen, Tian Cheng, Christophe Clément, Giuseppe Codispoti, Stewart Cole, Tommaso Colombo, Géraldine Conti, Greig Alan Cowan, Alessandro Degano, Sergey Denisov, Charles Dietz, Milos Dordevic, Dipanwita Dutta, Matthias Finger, Francesco Fiori, Julia Fischer, Peng Ge, Daniel Gonzalez, Jun Guo, Ruchi Gupta, Csaba Hajdu, Peter Hansen, James Henderson, Haoshuang Ji, Yi Jiang, Shan Jin, Alexis Kalogeropoulos, Viktor Khristenko, Ji Hyun Kim, Sun Hee Kim, Donghyun Kim, Sven Kreiss, Sanjeev Kumar, Ajay Kumar, Vineet Kumar, Ekaterina Kuznetsova, Federica Legger, Ho Ling Li, Yiming Li, Lei Li, Wei Li, Bing Li, Peter Lichard, Hao Liu, Jian Liu, Bo Liu, Kun Liu, Dong Liu, Shuai Liu, Lulu Liu, Werner Lustermann, Alexander Madsen, Bibhuprasad Mahakud, Andreas Alexander Maier, Matteo Marone, Ruslan Mashinistov, Lorenzo Massa, Jean-Pierre Meyer, Thomas Muller, Snezana Nektarijevic, Marzio Nessi, Konstantinos Nikolopoulos, Preema Rennee Pais, Ioannis Papadopoulos, Vladimir Petrov, Quentin Python, Yang Qin, Robert Richter, Andrea Rizzi, Paolo Ronchese, Manfredi Ronzani, Eduardo Ros, Stefano Rosati, Edoardo Rossi, Daniela Salvatore, Sourav Sen, Varun Sharma, Ashish Sharma, Lesya Shchutska, Muhammad Shoaib, Ljiljana Simic
2015
Article

Résumé

A measurement of the Higgs boson mass is presented based on the combined data samples of the ATLAS and CMS experiments at the CERN LHC in the $H \rightarrow \gamma\gamma$ and $H \rightarrow ZZ\rightarrow 4\ell$ decay channels. The results are obtained from a simultaneous fit to the reconstructed invariant mass peaks in the two channels and for the two experiments. The measured masses from the individual channels and the two experiments are found to be consistent among themselves. The combined measured mass of the Higgs boson is $m_{H} = 125.09\pm0.21\,\mathrm{(stat.)}\pm0.11\,\mathrm{(syst.)}~\mathrm{GeV}$ .

Official source

https://infoscience.epfl.ch/record/274710?ln=fr

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Official source

https://infoscience.epfl.ch/record/274710?ln=fr

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Chargement

Combination of inclusive and differential $ \mathrm{t}\overline{\mathrm{t}} $ charge asymmetry measurements using ATLAS and CMS data at $ \sqrt{s}=7 $ and 8 TeV

Muhammad Ahmad, Benjamin William Allen, Georgios Anagnostou, Konstantin Androsov, Spyridon Argyropoulos, Tagir Aushev, Mathieu Benoit, Nicolas Berger, Michele Bianco, Alexey Boldyrev, Lucrezia Stella Bruni, Simone Campana, Roberto Castello, Chunhui Chen, Xin Chen, Yixing Chen, Jie Chen, Cheng Chen, Tian Cheng, Davide Cieri, Christophe Clément, Giuseppe Codispoti, Géraldine Conti, Greig Alan Cowan, Pratyush Das, Alessandro Degano, Sergey Denisov, Milos Dordevic, Dipanwita Dutta, Matthias Finger, Francesco Fiori, Julia Fischer, Daniel Gonzalez, Yifei Guo, Jun Guo, Ruchi Gupta, Seungkyu Ha, Csaba Hajdu, Peter Hansen, Ali Harb, Miao Hu, Haoshuang Ji, Yi Jiang, Shan Jin, Alexis Kalogeropoulos, Viktor Khristenko, Sun Hee Kim, Ji Hyun Kim, Donghyun Kim, Ajay Kumar, Vineet Kumar, Sanjeev Kumar, Ekaterina Kuznetsova, Marie Christine Lanfermann, Robert Johannes Langenberg, Federica Legger, Bing Li, Xuan Li, Ho Ling Li, Yiming Li, Lei Li, Wei Li, Qi Li, Jing Li, Hao Liu, Jian Liu, Zhen Liu, Bo Liu, Kun Liu, Shuai Liu, Werner Lustermann, Alexander Madsen, Bibhuprasad Mahakud, Gino Marceca, Ruslan Mashinistov, Lara Hannan Mason, Lorenzo Massa, Maren Tabea Meinhard, Jean-Pierre Meyer, Thomas Muller, Snezana Nektarijevic, Marzio Nessi, Konstantinos Nikolopoulos, Ioannis Papadopoulos, Vladimir Petrov, Quentin Python, Yang Qin, Robert Richter, Andrea Rizzi, Paolo Ronchese, Manfredi Ronzani, Stefano Rosati, Edoardo Rossi, Daniela Salvatore, Enrico Junior Schioppa, Varun Sharma, Ashish Sharma, Lesya Shchutska, Wei Shi, Kun Shi

This paper presents combinations of inclusive and differential measurements of the charge asymmetry (A

_{C}

) in top quark pair

\left(\mathrm{t}\overline{\mathrm{t}}\right)

events with a lepton+jets signature by the ATLAS and CMS Collaborations, using data from LHC proton-proton collisions at centre-of-mass energies of 7 and 8 TeV. The data correspond to integrated luminosities of about 5 and 20 fb

^{−1}

for each experiment, respectively. The resulting combined LHC measurements of the inclusive charge asymmetry are A

_{C}^{CHC7}

= 0.005 ± 0.007 (stat) ± 0.006(syst) at 7 TeV and A

_{C}^{CHC8}

= 0.0055 ± 0.0023 (stat) ± 0.0025 (syst) at 8 TeV. These values, as well as the combination of A

_{C}

measurements as a function of the invariant mass of the

\mathrm{t}\overline{\mathrm{t}}

system at 8 TeV, are consistent with the respective standard model predictions.

2018

Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC pp collision data at $ \sqrt{s}=7 $ and 8 TeV

Muhammad Ahmad, Benjamin William Allen, Georgios Anagnostou, Konstantin Androsov, Spyridon Argyropoulos, Alexandre Aubin, Nicolas Berger, Michele Bianco, Alexey Boldyrev, Simone Campana, João Carvalho, Roberto Castello, Juan Ramon Castiñeiras De Saa, Matevz Cerv, Susan Cheatham, Yixing Chen, Xin Chen, Chunhui Chen, Tian Cheng, Davide Cieri, Christophe Clément, Giuseppe Codispoti, Tommaso Colombo, Géraldine Conti, Greig Alan Cowan, Alessandro Degano, Sergey Denisov, Charles Dietz, Milos Dordevic, Dipanwita Dutta, Matthias Finger, Francesco Fiori, Julia Fischer, Daniel Gonzalez, Jun Guo, Yifei Guo, Ruchi Gupta, Seungkyu Ha, Csaba Hajdu, Peter Hansen, Ali Harb, James Henderson, Haoshuang Ji, Yi Jiang, Shan Jin, Alexis Kalogeropoulos, Viktor Khristenko, Donghyun Kim, Sun Hee Kim, Ji Hyun Kim, Vineet Kumar, Ajay Kumar, Sanjeev Kumar, Ekaterina Kuznetsova, Federica Legger, Ho Ling Li, Qi Li, Lei Li, Bing Li, Xuan Li, Yiming Li, Wei Li, Peter Lichard, Hao Liu, Bo Liu, Jian Liu, Kun Liu, Zhen Liu, Lulu Liu, Dong Liu, Shuai Liu, Werner Lustermann, Alexander Madsen, Bibhuprasad Mahakud, Andreas Alexander Maier, Gino Marceca, Ruslan Mashinistov, Lorenzo Massa, Maren Tabea Meinhard, Jean-Pierre Meyer, Thomas Muller, Snezana Nektarijevic, Marzio Nessi, Konstantinos Nikolopoulos, Preema Rennee Pais, Ioannis Papadopoulos, Vladimir Petrov, Quentin Python, Yang Qin, Robert Richter, Andrea Rizzi, Paolo Ronchese, Manfredi Ronzani, Eduardo Ros, Stefano Rosati, Edoardo Rossi, Daniela Salvatore, Sourav Sen, Ashish Sharma, Varun Sharma

Combined ATLAS and CMS measurements of the Higgs boson production and decay rates, as well as constraints on its couplings to vector bosons and fermions, are presented. The combination is based on the analysis of five production processes, namely gluon fusion, vector boson fusion, and associated production with a W or a Z boson or a pair of top quarks, and of the six decay modes H → ZZ, W W , γγ, ττ, bb, and μμ. All results are reported assuming a value of 125.09 GeV for the Higgs boson mass, the result of the combined measurement by the ATLAS and CMS experiments. The analysis uses the CERN LHC proton-proton collision data recorded by the ATLAS and CMS experiments in 2011 and 2012, corresponding to integrated luminosities per experiment of approximately 5 fb

^{−1}

\sqrt{s}=7

TeV and 20 fb

^{−1}

\sqrt{s}=8

TeV. The Higgs boson production and decay rates measured by the two experiments are combined within the context of three generic parameterisations: two based on cross sections and branching fractions, and one on ratios of coupling modifiers. Several interpretations of the measurements with more model-dependent parameterisations are also given. The combined signal yield relative to the Standard Model prediction is measured to be 1.09 ± 0.11. The combined measurements lead to observed significances for the vector boson fusion production process and for the H → ττ decay of 5.4 and 5.5 standard deviations, respectively. The data are consistent with the Standard Model predictions for all parameterisations considered.

2016

Measurements of the pp $\to$ WZ inclusive and differential production cross section and constraints on charged anomalous triple gauge couplings at $\sqrt{s} =$ 13 TeV

Muhammad Ahmad, Benjamin William Allen, Georgios Anagnostou, Konstantin Androsov, Tagir Aushev, Michele Bianco, Yixing Chen, Xin Chen, Tian Cheng, Davide Cieri, Giuseppe Codispoti, Pratyush Das, Abhisek Datta, Milos Dordevic, Dipanwita Dutta, Matthias Finger, Francesco Fiori, Daniel Gonzalez, Ruchi Gupta, Seungkyu Ha, Csaba Hajdu, Peter Hansen, Ali Harb, Miao Hu, Alexis Kalogeropoulos, Viktor Khristenko, Donghyun Kim, Ji Hyun Kim, Sanjeev Kumar, Ajay Kumar, Vineet Kumar, Ekaterina Kuznetsova, Wei Li, Jing Li, Lei Li, Ho Ling Li, 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, Ashish Sharma, Varun Sharma, Lesya Shchutska, Kun Shi, Wei Shi, Muhammad Shoaib, Jan Steggemann, Marco Trovato, Andromachi Tsirou, David Vannerom, Joao Varela, Siyuan Wang, Zheng Wang, Mingkui Wang, Xiao Wang, Hui Wang, Jian Wang, Qian Wang, Yi Wang, Muhammad Waqas, Matthias Weber, Matthias Wolf, Fan Xia, Meng Xiao, Yong Yang

The WZ production cross section is measured in proton-proton collisions at a centre-of-mass energy

\sqrt{s}

= 13 TeV using data collected with the CMS detector, corresponding to an integrated luminosity of 35.9 fb

^{−1}

. The inclusive cross section is measured to be σ

_{tot}

(pp → WZ) = 48.09

_{− 0.96}^{+ 1.00}

(stat)

_{− 0.37}^{+ 0.44}

(theo)

_{− 2.17}^{+ 2.39}

(syst) ± 1.39(lum) pb, resulting in a total uncertainty of −2.78/+2.98 pb. Fiducial cross section and ratios of charge-dependent cross section measurements are provided. Differential cross section measurements are also presented with respect to three variables: the Z boson transverse momentum p

_{T}

, the leading jet p

_{T}

, and the M(WZ) variable, defined as the invariant mass of the system composed of the three leptons and the missing transverse momentum. Differential measurements with respect to the W boson p

_{T}

, separated by charge, are also shown. Results are consistent with standard model predictions, favouring next-to-next-to-leading-order predictions over those at next-to-leading order. Constraints on anomalous triple gauge couplings are derived via a binned maximum likelihood fit to the M(WZ) variable.

Springer2019