Search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a Z boson in pp collisions at root s=13 TeV with the ATLAS detector

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

doi:10.1016/j.physletb.2017.11.049

Search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a Z boson in pp collisions at root s=13 TeV with the ATLAS detector

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

Experimental Particle Physics

52 Citations (Scopus)

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Abstract

A search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a leptonically decaying Z boson in proton–proton collisions at s=13 TeV is presented. This search uses 36.1 fb⁻¹ of data collected by the ATLAS experiment at the Large Hadron Collider. No significant deviation from the expectation of the Standard Model backgrounds is observed. Assuming the Standard Model ZH production cross-section, an observed (expected) upper limit of 67% (39%) at the 95% confidence level is set on the branching ratio of invisible decays of the Higgs boson with mass m_H=125 GeV. The corresponding limits on the production cross-section of the ZH process with the invisible Higgs boson decays are also presented. Furthermore, exclusion limits on the dark matter candidate and mediator masses are reported in the framework of simplified dark matter models.

Original language	English
Journal	Physics Letters B
Volume	776
Pages (from-to)	318-337
Number of pages	20
ISSN	0370-2693
DOIs	https://doi.org/10.1016/j.physletb.2017.11.049
Publication status	Published - 10 Jan 2018

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Aaboud, M., Aad, G., Abbott, B., Abdinov, O., Abeloos, B., Abidi, S. H., Abouzeid, O. S. A., Abraham, NL., Abramowicz, H., Abreu, H., Abreu, R., Abulaiti, Y., Acharya, B. S., Adachi, S., Adamczyk, L., Adelman, J., Adersberger, M., Adye, T., Affolder, A. A., ... Xella, S. (2018). Search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a Z boson in pp collisions at root s=13 TeV with the ATLAS detector. Physics Letters B, 776, 318-337. https://doi.org/10.1016/j.physletb.2017.11.049

Aaboud, M, Aad, G, Abbott, B, Abdinov, O, Abeloos, B, Abidi, SH, Abouzeid, OSA, Abraham, NL, Abramowicz, H, Abreu, H, Abreu, R, Abulaiti, Y, Acharya, BS, Adachi, S, Adamczyk, L, Adelman, J, Adersberger, M, Adye, T, Affolder, AA, Dam, M , Hansen, PH , Hansen, JB, Besjes, G-J, Hansen, JD, Alonso Diaz, A, de Almeida Dias, F, Galster, GAGK, Wiglesworth, G, Thiele, FAJ, Monk, JW, Bajic, M, Petersen, TC, Stark, SH & Xella, S 2018, 'Search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a Z boson in pp collisions at root s=13 TeV with the ATLAS detector', Physics Letters B, vol. 776, pp. 318-337. https://doi.org/10.1016/j.physletb.2017.11.049

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title = "Search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a Z boson in pp collisions at root s=13 TeV with the ATLAS detector",

abstract = "A search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a leptonically decaying Z boson in proton–proton collisions at s=13 TeV is presented. This search uses 36.1 fb−1 of data collected by the ATLAS experiment at the Large Hadron Collider. No significant deviation from the expectation of the Standard Model backgrounds is observed. Assuming the Standard Model ZH production cross-section, an observed (expected) upper limit of 67% (39%) at the 95% confidence level is set on the branching ratio of invisible decays of the Higgs boson with mass mH=125 GeV. The corresponding limits on the production cross-section of the ZH process with the invisible Higgs boson decays are also presented. Furthermore, exclusion limits on the dark matter candidate and mediator masses are reported in the framework of simplified dark matter models.",

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

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T1 - Search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a Z boson in pp collisions at root s=13 TeV with the ATLAS detector

AU - Aaboud, M.

AU - Aad, G.

AU - Abbott, B.

AU - Abdinov, O.

AU - Abeloos, B

AU - Abidi, S.H.

AU - Abouzeid, Ossama Sherif Alexander

AU - Abraham, NL

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abreu, R.

AU - Abulaiti, Y.

AU - Acharya, B.S.

AU - Adachi, Shin-ichi

AU - Adamczyk, L.

AU - Adelman, J.

AU - Adersberger, M.

AU - Adye, T.

AU - Affolder, A. A.

AU - Dam, Mogens

AU - Hansen, Peter Henrik

AU - Hansen, Jørgen Beck

AU - Besjes, Geert-Jan

AU - Hansen, Jørn Dines

AU - Alonso Diaz, Alejandro

AU - de Almeida Dias, Flavia

AU - Galster, Gorm Aske Gram Krohn

AU - Wiglesworth, Graig

AU - Thiele, Fabian Alexander Jürgen

AU - Monk, James William

AU - Bajic, Milena

AU - Petersen, Troels Christian

AU - Stark, Simon Holm

AU - Xella, Stefania

PY - 2018/1/10

Y1 - 2018/1/10

N2 - A search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a leptonically decaying Z boson in proton–proton collisions at s=13 TeV is presented. This search uses 36.1 fb−1 of data collected by the ATLAS experiment at the Large Hadron Collider. No significant deviation from the expectation of the Standard Model backgrounds is observed. Assuming the Standard Model ZH production cross-section, an observed (expected) upper limit of 67% (39%) at the 95% confidence level is set on the branching ratio of invisible decays of the Higgs boson with mass mH=125 GeV. The corresponding limits on the production cross-section of the ZH process with the invisible Higgs boson decays are also presented. Furthermore, exclusion limits on the dark matter candidate and mediator masses are reported in the framework of simplified dark matter models.

AB - A search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a leptonically decaying Z boson in proton–proton collisions at s=13 TeV is presented. This search uses 36.1 fb−1 of data collected by the ATLAS experiment at the Large Hadron Collider. No significant deviation from the expectation of the Standard Model backgrounds is observed. Assuming the Standard Model ZH production cross-section, an observed (expected) upper limit of 67% (39%) at the 95% confidence level is set on the branching ratio of invisible decays of the Higgs boson with mass mH=125 GeV. The corresponding limits on the production cross-section of the ZH process with the invisible Higgs boson decays are also presented. Furthermore, exclusion limits on the dark matter candidate and mediator masses are reported in the framework of simplified dark matter models.

U2 - 10.1016/j.physletb.2017.11.049

DO - 10.1016/j.physletb.2017.11.049

M3 - Journal article

SN - 0370-2693

VL - 776

SP - 318

EP - 337

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

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

ER -

Search for an invisibly decaying Higgs boson or dark matter candidates produced in association with a Z boson in pp collisions at root s=13 TeV with the ATLAS detector

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