Search for an additional, heavy Higgs boson in the decay channel at in collision data with the ATLAS detector

G. Aad; B. Abbott; J. Abdallah; O. Abdinov; R. Aben; M. Abolins; O.S. AbouZeid; H. Abramowicz; H. Abreu; R. Abreu; B.S. Acharya; L. Adamczyk; David L. Adams; T. Adye; Mogens Dam; Jørn Dines Hansen; Jørgen Beck Hansen; Stefania Xella; Peter Henrik Hansen; Troels Christian Petersen; Lotte Ansgaard Thomsen; Almut Maria Pingel; Ask Emil Løvschall-Jensen; Alejandro Alonso Diaz; James William Monk; Lars Egholm Pedersen; Graig Wiglesworth; Gorm Aske Gram Krohn Galster

doi:10.1140/epjc/s10052-015-3820-z

Search for an additional, heavy Higgs boson in the decay channel at in collision data with the ATLAS detector

G. Aad, B. Abbott, J. Abdallah, O. Abdinov, R. Aben, M. Abolins, O.S. AbouZeid, H. Abramowicz, H. Abreu, R. Abreu, B.S. Acharya, L. Adamczyk, David L. Adams, T. Adye, Mogens Dam, Jørn Dines Hansen, Jørgen Beck Hansen, Stefania Xella, Peter Henrik Hansen, Troels Christian PetersenLotte Ansgaard Thomsen, Almut Maria Pingel, Ask Emil Løvschall-Jensen, Alejandro Alonso Diaz, James William Monk, Lars Egholm Pedersen, Graig Wiglesworth, Gorm Aske Gram Krohn Galster

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Abstract

A search is presented for a high-mass Higgs boson in the H → ZZ → ℓ⁺ℓ^-ℓ⁺ℓ^-, (Formula Presented), (Formula Presented), and (Formula Presented) decay modes using the ATLAS detector at the CERN Large Hadron Collider. The search uses proton–proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3fb^-1. The results of the search are interpreted in the scenario of a heavy Higgs boson with a width that is small compared with the experimental mass resolution. The Higgs boson mass range considered extends up to 1 TeV for all four decay modes and down to as low as 140 GeV, depending on the decay mode. No significant excess of events over the Standard Model prediction is found. A simultaneous fit to the four decay modes yields upper limits on the production cross-section of a heavy Higgs boson times the branching ratio to Z boson pairs. 95% confidence level upper limits range from 0.53 pb at m_H=195 GeV to 0.008 pb at m_H=950GeV for the gluon-fusion production mode and from 0.31pb at m_H=195GeV to 0.009pb at m_H=950GeV for the vector-boson-fusion production mode. The results are also interpreted in the context of Type-I and Type-II two-Higgs-doublet models.

Originalsprog	Engelsk
Artikelnummer	45
Tidsskrift	European Physical Journal C
Vol/bind	76
Udgave nummer	1
ISSN	1434-6044
DOI	https://doi.org/10.1140/epjc/s10052-015-3820-z
Status	Udgivet - 25 jan. 2016

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10.1140/epjc/s10052-015-3820-zLicens: CC BY

art_10.1140_epjc_s10052-015-3820-zForlagets udgivne version, 2,58 MBLicens: CC BY

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Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Aben, R., Abolins, M., AbouZeid, O. S., Abramowicz, H., Abreu, H., Abreu, R., Acharya, B. S., Adamczyk, L., Adams, D. L., Adye, T., Dam, M., Hansen, J. D., Hansen, J. B., Xella, S., Hansen, P. H., ... Galster, G. A. G. K. (2016). Search for an additional, heavy Higgs boson in the decay channel at in collision data with the ATLAS detector. European Physical Journal C, 76(1), [45]. https://doi.org/10.1140/epjc/s10052-015-3820-z

Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H, Abreu, R, Acharya, BS, Adamczyk, L, Adams, DL, Adye, T, Dam, M , Hansen, JD , Hansen, JB , Xella, S , Hansen, PH , Petersen, TC, Thomsen, LA, Pingel, AM, Løvschall-Jensen, AE, Alonso Diaz, A, Monk, JW, Pedersen, LE, Wiglesworth, G & Galster, GAGK 2016, 'Search for an additional, heavy Higgs boson in the decay channel at in collision data with the ATLAS detector', European Physical Journal C, bind 76, nr. 1, 45. https://doi.org/10.1140/epjc/s10052-015-3820-z

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title = "Search for an additional, heavy Higgs boson in the decay channel at in collision data with the ATLAS detector",

abstract = "A search is presented for a high-mass Higgs boson in the H → ZZ → ℓ+ℓ-ℓ+ℓ-, (Formula Presented), (Formula Presented), and (Formula Presented) decay modes using the ATLAS detector at the CERN Large Hadron Collider. The search uses proton–proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3fb-1. The results of the search are interpreted in the scenario of a heavy Higgs boson with a width that is small compared with the experimental mass resolution. The Higgs boson mass range considered extends up to 1 TeV for all four decay modes and down to as low as 140 GeV, depending on the decay mode. No significant excess of events over the Standard Model prediction is found. A simultaneous fit to the four decay modes yields upper limits on the production cross-section of a heavy Higgs boson times the branching ratio to Z boson pairs. 95% confidence level upper limits range from 0.53 pb at mH=195 GeV to 0.008 pb at mH=950GeV for the gluon-fusion production mode and from 0.31pb at mH=195GeV to 0.009pb at mH=950GeV for the vector-boson-fusion production mode. The results are also interpreted in the context of Type-I and Type-II two-Higgs-doublet models.",

author = "G. Aad and B. Abbott and J. Abdallah and O. Abdinov and R. Aben and M. Abolins and O.S. AbouZeid and H. Abramowicz and H. Abreu and R. Abreu and B.S. Acharya and L. Adamczyk and Adams, {David L.} and T. Adye and Mogens Dam and Hansen, {J{\o}rn Dines} and Hansen, {J{\o}rgen Beck} and Stefania Xella and Hansen, {Peter Henrik} and Petersen, {Troels Christian} and Thomsen, {Lotte Ansgaard} and Pingel, {Almut Maria} and L{\o}vschall-Jensen, {Ask Emil} and {Alonso Diaz}, Alejandro and Monk, {James William} and Pedersen, {Lars Egholm} and Graig Wiglesworth and Galster, {Gorm Aske Gram Krohn}",

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T1 - Search for an additional, heavy Higgs boson in the decay channel at in collision data with the ATLAS detector

AU - Aad, G.

AU - Abbott, B.

AU - Abdallah, J.

AU - Abdinov, O.

AU - Aben, R.

AU - Abolins, M.

AU - AbouZeid, O.S.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Acharya, B.S.

AU - Adamczyk, L.

AU - Adams, David L.

AU - Adye, T.

AU - Dam, Mogens

AU - Hansen, Jørn Dines

AU - Hansen, Jørgen Beck

AU - Xella, Stefania

AU - Hansen, Peter Henrik

AU - Petersen, Troels Christian

AU - Thomsen, Lotte Ansgaard

AU - Pingel, Almut Maria

AU - Løvschall-Jensen, Ask Emil

AU - Alonso Diaz, Alejandro

AU - Monk, James William

AU - Pedersen, Lars Egholm

AU - Wiglesworth, Graig

AU - Galster, Gorm Aske Gram Krohn

PY - 2016/1/25

Y1 - 2016/1/25

N2 - A search is presented for a high-mass Higgs boson in the H → ZZ → ℓ+ℓ-ℓ+ℓ-, (Formula Presented), (Formula Presented), and (Formula Presented) decay modes using the ATLAS detector at the CERN Large Hadron Collider. The search uses proton–proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3fb-1. The results of the search are interpreted in the scenario of a heavy Higgs boson with a width that is small compared with the experimental mass resolution. The Higgs boson mass range considered extends up to 1 TeV for all four decay modes and down to as low as 140 GeV, depending on the decay mode. No significant excess of events over the Standard Model prediction is found. A simultaneous fit to the four decay modes yields upper limits on the production cross-section of a heavy Higgs boson times the branching ratio to Z boson pairs. 95% confidence level upper limits range from 0.53 pb at mH=195 GeV to 0.008 pb at mH=950GeV for the gluon-fusion production mode and from 0.31pb at mH=195GeV to 0.009pb at mH=950GeV for the vector-boson-fusion production mode. The results are also interpreted in the context of Type-I and Type-II two-Higgs-doublet models.

AB - A search is presented for a high-mass Higgs boson in the H → ZZ → ℓ+ℓ-ℓ+ℓ-, (Formula Presented), (Formula Presented), and (Formula Presented) decay modes using the ATLAS detector at the CERN Large Hadron Collider. The search uses proton–proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3fb-1. The results of the search are interpreted in the scenario of a heavy Higgs boson with a width that is small compared with the experimental mass resolution. The Higgs boson mass range considered extends up to 1 TeV for all four decay modes and down to as low as 140 GeV, depending on the decay mode. No significant excess of events over the Standard Model prediction is found. A simultaneous fit to the four decay modes yields upper limits on the production cross-section of a heavy Higgs boson times the branching ratio to Z boson pairs. 95% confidence level upper limits range from 0.53 pb at mH=195 GeV to 0.008 pb at mH=950GeV for the gluon-fusion production mode and from 0.31pb at mH=195GeV to 0.009pb at mH=950GeV for the vector-boson-fusion production mode. The results are also interpreted in the context of Type-I and Type-II two-Higgs-doublet models.

U2 - 10.1140/epjc/s10052-015-3820-z

DO - 10.1140/epjc/s10052-015-3820-z

M3 - Journal article

C2 - 26949371

SN - 1434-6044

VL - 76

JO - The European Physical Journal C: Particles and Fields

JF - The European Physical Journal C: Particles and Fields

IS - 1

M1 - 45

ER -

Search for an additional, heavy Higgs boson in the decay channel at in collision data with the ATLAS detector

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