Search for dark matter produced in association with bottom or top quarks in root s=13 TeV pp collisions 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; Milena Bajic; Geert-Jan Besjes; Alejandro Alonso Diaz; Flavia de Almeida Dias; Mogens Dam; Peter Henrik Hansen; Gorm Aske Gram Krohn Galster; Jørn Dines Hansen; Jørgen Beck Hansen; Graig Wiglesworth; Fabian Alexander Jürgen Thiele; James William Monk; Troels Christian Petersen; Simon Holm Stark; Stefania Xella

doi:10.1140/epjc/s10052-017-5486-1

Search for dark matter produced in association with bottom or top quarks in root s=13 TeV pp collisions 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, Milena BajicGeert-Jan Besjes, Alejandro Alonso Diaz, Flavia de Almeida Dias, Mogens Dam, Peter Henrik Hansen, Gorm Aske Gram Krohn Galster, Jørn Dines Hansen, Jørgen Beck Hansen, Graig Wiglesworth, Fabian Alexander Jürgen Thiele, James William Monk, Troels Christian Petersen, Simon Holm Stark, Stefania Xella

Experimental Particle Physics

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Abstract

A search for weakly interacting massive dark-matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. The analysis uses 36.1fb-1 of proton–proton collision data recorded by the ATLAS experiment at s=13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are interpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour-neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross-section of 300 times the predicted rate for mediators with masses between 10 and 50GeV and assuming a dark-matter mass of 1GeV and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35GeV, mediator particles with mass below 1.1TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements.

Original language	English
Article number	18
Journal	European Physical Journal C
Volume	78
Issue number	1
Number of pages	36
ISSN	1434-6044
DOIs	https://doi.org/10.1140/epjc/s10052-017-5486-1
Publication status	Published - 1 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 dark matter produced in association with bottom or top quarks in root s=13 TeV pp collisions with the ATLAS detector. European Physical Journal C, 78(1), [18]. https://doi.org/10.1140/epjc/s10052-017-5486-1

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, Bajic, M, Besjes, G-J, Alonso Diaz, A, de Almeida Dias, F, Dam, M , Hansen, PH, Galster, GAGK, Hansen, JD , Hansen, JB , Wiglesworth, G, Thiele, FAJ, Monk, JW, Petersen, TC, Stark, SH & Xella, S 2018, 'Search for dark matter produced in association with bottom or top quarks in root s=13 TeV pp collisions with the ATLAS detector', European Physical Journal C, vol. 78, no. 1, 18. https://doi.org/10.1140/epjc/s10052-017-5486-1

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title = "Search for dark matter produced in association with bottom or top quarks in root s=13 TeV pp collisions with the ATLAS detector",

abstract = "A search for weakly interacting massive dark-matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. The analysis uses 36.1fb-1 of proton–proton collision data recorded by the ATLAS experiment at s=13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are interpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour-neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross-section of 300 times the predicted rate for mediators with masses between 10 and 50GeV and assuming a dark-matter mass of 1GeV and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35GeV, mediator particles with mass below 1.1TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements.",

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 Milena Bajic and Geert-Jan Besjes and {Alonso Diaz}, Alejandro and {de Almeida Dias}, Flavia and Mogens Dam and Hansen, {Peter Henrik} and Galster, {Gorm Aske Gram Krohn} and Hansen, {J{\o}rn Dines} and Hansen, {J{\o}rgen Beck} and Graig Wiglesworth and Thiele, {Fabian Alexander J{\"u}rgen} and Monk, {James William} and Petersen, {Troels Christian} and Stark, {Simon Holm} and Stefania Xella",

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T1 - Search for dark matter produced in association with bottom or top quarks in root s=13 TeV pp collisions 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 - Bajic, Milena

AU - Besjes, Geert-Jan

AU - Alonso Diaz, Alejandro

AU - de Almeida Dias, Flavia

AU - Dam, Mogens

AU - Hansen, Peter Henrik

AU - Galster, Gorm Aske Gram Krohn

AU - Hansen, Jørn Dines

AU - Hansen, Jørgen Beck

AU - Wiglesworth, Graig

AU - Thiele, Fabian Alexander Jürgen

AU - Monk, James William

AU - Petersen, Troels Christian

AU - Stark, Simon Holm

AU - Xella, Stefania

PY - 2018/1/1

Y1 - 2018/1/1

N2 - A search for weakly interacting massive dark-matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. The analysis uses 36.1fb-1 of proton–proton collision data recorded by the ATLAS experiment at s=13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are interpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour-neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross-section of 300 times the predicted rate for mediators with masses between 10 and 50GeV and assuming a dark-matter mass of 1GeV and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35GeV, mediator particles with mass below 1.1TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements.

AB - A search for weakly interacting massive dark-matter particles produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and missing transverse momentum are considered. The analysis uses 36.1fb-1 of proton–proton collision data recorded by the ATLAS experiment at s=13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are interpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour-neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross-section of 300 times the predicted rate for mediators with masses between 10 and 50GeV and assuming a dark-matter mass of 1GeV and unitary coupling. Constraints on colour-charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35GeV, mediator particles with mass below 1.1TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements.

U2 - 10.1140/epjc/s10052-017-5486-1

DO - 10.1140/epjc/s10052-017-5486-1

M3 - Journal article

C2 - 31265005

SN - 1434-6044

VL - 78

JO - The European Physical Journal C: Particles and Fields

JF - The European Physical Journal C: Particles and Fields

IS - 1

M1 - 18

ER -

Search for dark matter produced in association with bottom or top quarks in root s=13 TeV pp collisions with the ATLAS detector

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