Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector

M. Aaboud; A. Aad; B. Abbott; O. Abdinov; B Abeloos; DK Abhayasinghe; S.H. Abidi; Ossama Sherif Alexander Abouzeid; NL Abraham; H. Abramowicz; H. Abreu; Y. Abulaiti; B.S. Acharya; Shin-ichi Adachi; L. Adamczyk; J. Adelman; M. Adersberger; A. Adiguzel; T. Adye; A. A. Affolder; Y.  Afik; C. Agheorghiesei; Milena Bajic; Geert-Jan Besjes; Alejandro Alonso Diaz; Mogens Dam; Flavia de Almeida Dias; Gorm Aske Gram Krohn Galster; Jørgen Beck Hansen; Jørn Dines Hansen; Peter Henrik Hansen; James William Monk; Troels Christian Petersen; Simon Holm Stark; Fabian Alexander Jürgen Thiele; Stefania Xella; Graig Wiglesworth

doi:10.1016/j.physletb.2018.07.035

Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector

M. Aaboud, A. Aad, B. Abbott, O. Abdinov, B Abeloos, DK Abhayasinghe, S.H. Abidi, Ossama Sherif Alexander Abouzeid, NL Abraham, H. Abramowicz, H. Abreu, Y. Abulaiti, B.S. Acharya, Shin-ichi Adachi, L. Adamczyk, J. Adelman, M. Adersberger, A. Adiguzel, T. Adye, A. A. AffolderY. Afik, C. Agheorghiesei, Milena Bajic, Geert-Jan Besjes, Alejandro Alonso Diaz, Mogens Dam, Flavia de Almeida Dias, Gorm Aske Gram Krohn Galster, Jørgen Beck Hansen, Jørn Dines Hansen, Peter Henrik Hansen, James William Monk, Troels Christian Petersen, Simon Holm Stark, Fabian Alexander Jürgen Thiele, Stefania Xella, Graig Wiglesworth

Experimental Particle Physics

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Abstract

The observation of Higgs boson production in association with a top quark pair (tt¯H), based on the analysis of proton–proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb⁻¹, and considering Higgs boson decays into bb¯, WW^⁎, τ⁺τ⁻, γγ, and ZZ^⁎, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the tt¯H searches using a dataset corresponding to integrated luminosities of 4.5 fb⁻¹ at 7 TeV and 20.3 fb⁻¹ at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total tt¯H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) ₋₁₀₀ ⁺¹¹⁰ (syst.) fb, in agreement with the Standard Model prediction.

Original language	English
Journal	Physics Letters B
Volume	784
Pages (from-to)	173-191
Number of pages	19
ISSN	0370-2693
DOIs	https://doi.org/10.1016/j.physletb.2018.07.035
Publication status	Published - 10 Sept 2018

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Aaboud, M., Aad, A., Abbott, B., Abdinov, O., Abeloos, B., Abhayasinghe, DK., Abidi, S. H., Abouzeid, O. S. A., Abraham, NL., Abramowicz, H., Abreu, H., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adelman, J., Adersberger, M., Adiguzel, A., Adye, T., ... Wiglesworth, G. (2018). Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector. Physics Letters B, 784, 173-191. https://doi.org/10.1016/j.physletb.2018.07.035

Aaboud, M, Aad, A, Abbott, B, Abdinov, O, Abeloos, B, Abhayasinghe, DK, Abidi, SH, Abouzeid, OSA, Abraham, NL, Abramowicz, H, Abreu, H, Abulaiti, Y, Acharya, BS, Adachi, S, Adamczyk, L, Adelman, J, Adersberger, M, Adiguzel, A, Adye, T, Affolder, AA, Afik, Y, Agheorghiesei, C, Bajic, M, Besjes, G-J, Alonso Diaz, A, Dam, M, de Almeida Dias, F, Galster, GAGK, Hansen, JB , Hansen, JD , Hansen, PH, Monk, JW, Petersen, TC, Stark, SH, Thiele, FAJ, Xella, S & Wiglesworth, G 2018, 'Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector', Physics Letters B, vol. 784, pp. 173-191. https://doi.org/10.1016/j.physletb.2018.07.035

@article{d71e21466bdf4e858c5f95aec1db39d3,

title = "Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector",

abstract = "The observation of Higgs boson production in association with a top quark pair (tt¯H), based on the analysis of proton–proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb−1, and considering Higgs boson decays into bb¯, WW⁎, τ+τ−, γγ, and ZZ⁎, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the tt¯H searches using a dataset corresponding to integrated luminosities of 4.5 fb−1 at 7 TeV and 20.3 fb−1 at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total tt¯H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) −100 +110 (syst.) fb, in agreement with the Standard Model prediction.",

author = "M. Aaboud and A. Aad and B. Abbott and O. Abdinov and B Abeloos and DK Abhayasinghe and S.H. Abidi and Abouzeid, {Ossama Sherif Alexander} and NL Abraham and H. Abramowicz and H. Abreu and Y. Abulaiti and B.S. Acharya and Shin-ichi Adachi and L. Adamczyk and J. Adelman and M. Adersberger and A. Adiguzel and T. Adye and Affolder, {A. A.} and Y. Afik and C. Agheorghiesei and Milena Bajic and Geert-Jan Besjes and {Alonso Diaz}, Alejandro and Mogens Dam and {de Almeida Dias}, Flavia and Galster, {Gorm Aske Gram Krohn} and Hansen, {J{\o}rgen Beck} and Hansen, {J{\o}rn Dines} and Hansen, {Peter Henrik} and Monk, {James William} and Petersen, {Troels Christian} and Stark, {Simon Holm} and Thiele, {Fabian Alexander J{\"u}rgen} and Stefania Xella and Graig Wiglesworth",

year = "2018",

month = sep,

day = "10",

doi = "10.1016/j.physletb.2018.07.035",

language = "English",

volume = "784",

pages = "173--191",

journal = "Physics Letters B: Particle Physics, Nuclear Physics and Cosmology",

issn = "0370-2693",

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TY - JOUR

T1 - Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector

AU - Aaboud, M.

AU - Aad, A.

AU - Abbott, B.

AU - Abdinov, O.

AU - Abeloos, B

AU - Abhayasinghe, DK

AU - Abidi, S.H.

AU - Abouzeid, Ossama Sherif Alexander

AU - Abraham, NL

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abulaiti, Y.

AU - Acharya, B.S.

AU - Adachi, Shin-ichi

AU - Adamczyk, L.

AU - Adelman, J.

AU - Adersberger, M.

AU - Adiguzel, A.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Agheorghiesei, C.

AU - Bajic, Milena

AU - Besjes, Geert-Jan

AU - Alonso Diaz, Alejandro

AU - Dam, Mogens

AU - de Almeida Dias, Flavia

AU - Galster, Gorm Aske Gram Krohn

AU - Hansen, Jørgen Beck

AU - Hansen, Jørn Dines

AU - Hansen, Peter Henrik

AU - Monk, James William

AU - Petersen, Troels Christian

AU - Stark, Simon Holm

AU - Thiele, Fabian Alexander Jürgen

AU - Xella, Stefania

AU - Wiglesworth, Graig

PY - 2018/9/10

Y1 - 2018/9/10

N2 - The observation of Higgs boson production in association with a top quark pair (tt¯H), based on the analysis of proton–proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb−1, and considering Higgs boson decays into bb¯, WW⁎, τ+τ−, γγ, and ZZ⁎, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the tt¯H searches using a dataset corresponding to integrated luminosities of 4.5 fb−1 at 7 TeV and 20.3 fb−1 at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total tt¯H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) −100 +110 (syst.) fb, in agreement with the Standard Model prediction.

AB - The observation of Higgs boson production in association with a top quark pair (tt¯H), based on the analysis of proton–proton collision data at a centre-of-mass energy of 13 TeV recorded with the ATLAS detector at the Large Hadron Collider, is presented. Using data corresponding to integrated luminosities of up to 79.8 fb−1, and considering Higgs boson decays into bb¯, WW⁎, τ+τ−, γγ, and ZZ⁎, the observed significance is 5.8 standard deviations, compared to an expectation of 4.9 standard deviations. Combined with the tt¯H searches using a dataset corresponding to integrated luminosities of 4.5 fb−1 at 7 TeV and 20.3 fb−1 at 8 TeV, the observed (expected) significance is 6.3 (5.1) standard deviations. Assuming Standard Model branching fractions, the total tt¯H production cross section at 13 TeV is measured to be 670 ± 90 (stat.) −100 +110 (syst.) fb, in agreement with the Standard Model prediction.

U2 - 10.1016/j.physletb.2018.07.035

DO - 10.1016/j.physletb.2018.07.035

M3 - Journal article

SN - 0370-2693

VL - 784

SP - 173

EP - 191

JO - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

JF - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

ER -

Observation of Higgs boson production in association with a top quark pair at the LHC with the ATLAS detector

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