A search for resonances decaying into a Higgs boson and a new particle X in the XH -> qqbb final state 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; Sosuke Adachi; L. Adamczyk; J. Adelman; M. Adersberger; T. Adye; A. A. Affolder; Y.  Afik; C. Agheorghiesei; J. A. Aguilar-Saavedra; S. P. Ahlen; Jørn Dines Hansen; Jørgen Beck Hansen; Stefania Xella; Mogens Dam; Peter Henrik Hansen; Troels Christian Petersen; Alejandro Alonso Diaz; James William Monk; Graig Wiglesworth; Milena Bajic; Fabian Alexander Jürgen Thiele; Geert-Jan Besjes; Flavia de Almeida Dias; Simon Holm Stark; Gorm Aske Gram Krohn Galster; The ATLAS collaboration; The ALICE collaboration

doi:10.1016/j.physletb.2018.01.042

A search for resonances decaying into a Higgs boson and a new particle X in the XH -> qqbb final state 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, Sosuke Adachi, L. Adamczyk, J. Adelman, M. Adersberger, T. Adye, A. A. Affolder, Y. AfikC. Agheorghiesei, J. A. Aguilar-Saavedra, S. P. Ahlen, Jørn Dines Hansen, Jørgen Beck Hansen, Stefania Xella, Mogens Dam, Peter Henrik Hansen, Troels Christian Petersen, Alejandro Alonso Diaz, James William Monk, Graig Wiglesworth, Milena Bajic, Fabian Alexander Jürgen Thiele, Geert-Jan Besjes, Flavia de Almeida Dias, Simon Holm Stark, Gorm Aske Gram Krohn Galster, The ATLAS collaboration, The ALICE collaboration

Experimental Particle Physics

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Abstract

A search for heavy resonances decaying into a Higgs boson (H) and a new particle (X) is reported, utilizing 36.1 fb⁻¹ of proton–proton collision data at s=13TeV collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle X is assumed to decay to a pair of light quarks, and the fully hadronic final state XH→qq¯^′bb¯ is analysed. The search considers the regime of high XH resonance masses, where the X and H bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of XH mass versus X mass is scanned for evidence of a signal, over a range of XH resonance mass values between 1 TeV and 4 TeV, and for X particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of XH and X masses, on the production cross-section of the XH→qq¯^′bb¯ resonance.

Original language	English
Journal	Physics Letters B
Volume	779
Pages (from-to)	24-45
ISSN	0370-2693
DOIs	https://doi.org/10.1016/j.physletb.2018.01.042
Publication status	Published - 10 Apr 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., ... The ALICE collaboration (2018). A search for resonances decaying into a Higgs boson and a new particle X in the XH -> qqbb final state with the ATLAS detector. Physics Letters B, 779, 24-45. https://doi.org/10.1016/j.physletb.2018.01.042

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, Afik, Y, Agheorghiesei, C, Aguilar-Saavedra, JA, Ahlen, SP, Hansen, JD , Hansen, JB , Xella, S , Dam, M , Hansen, PH , Petersen, TC, Alonso Diaz, A, Monk, JW, Wiglesworth, G, Bajic, M, Thiele, FAJ, Besjes, G-J, de Almeida Dias, F, Stark, SH, Galster, GAGK, The ATLAS collaboration & The ALICE collaboration 2018, 'A search for resonances decaying into a Higgs boson and a new particle X in the XH -> qqbb final state with the ATLAS detector', Physics Letters B, vol. 779, pp. 24-45. https://doi.org/10.1016/j.physletb.2018.01.042

@article{ca3dc35f339c414cbe29e65bdcc60217,

title = "A search for resonances decaying into a Higgs boson and a new particle X in the XH -> qqbb final state with the ATLAS detector",

abstract = "A search for heavy resonances decaying into a Higgs boson (H) and a new particle (X) is reported, utilizing 36.1 fb−1 of proton–proton collision data at s=13TeV collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle X is assumed to decay to a pair of light quarks, and the fully hadronic final state XH→qq¯′bb¯ is analysed. The search considers the regime of high XH resonance masses, where the X and H bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of XH mass versus X mass is scanned for evidence of a signal, over a range of XH resonance mass values between 1 TeV and 4 TeV, and for X particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of XH and X masses, on the production cross-section of the XH→qq¯′bb¯ resonance.",

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 Sosuke Adachi and L. Adamczyk and J. Adelman and M. Adersberger and T. Adye and Affolder, {A. A.} and Y. Afik and C. Agheorghiesei and Aguilar-Saavedra, {J. A.} and Ahlen, {S. P.} and Hansen, {J{\o}rn Dines} and Hansen, {J{\o}rgen Beck} and Stefania Xella and Mogens Dam and Hansen, {Peter Henrik} and Petersen, {Troels Christian} and {Alonso Diaz}, Alejandro and Monk, {James William} and Graig Wiglesworth and Milena Bajic and Thiele, {Fabian Alexander J{\"u}rgen} and Geert-Jan Besjes and {de Almeida Dias}, Flavia and Stark, {Simon Holm} and Galster, {Gorm Aske Gram Krohn} and {The ATLAS collaboration} and {The ALICE collaboration}",

year = "2018",

month = apr,

day = "10",

doi = "10.1016/j.physletb.2018.01.042",

language = "English",

volume = "779",

pages = "24--45",

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issn = "0370-2693",

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TY - JOUR

T1 - A search for resonances decaying into a Higgs boson and a new particle X in the XH -> qqbb final state 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, Sosuke

AU - Adamczyk, L.

AU - Adelman, J.

AU - Adersberger, M.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Agheorghiesei, C.

AU - Aguilar-Saavedra, J. A.

AU - Ahlen, S. P.

AU - Hansen, Jørn Dines

AU - Hansen, Jørgen Beck

AU - Xella, Stefania

AU - Dam, Mogens

AU - Hansen, Peter Henrik

AU - Petersen, Troels Christian

AU - Alonso Diaz, Alejandro

AU - Monk, James William

AU - Wiglesworth, Graig

AU - Bajic, Milena

AU - Thiele, Fabian Alexander Jürgen

AU - Besjes, Geert-Jan

AU - de Almeida Dias, Flavia

AU - Stark, Simon Holm

AU - Galster, Gorm Aske Gram Krohn

AU - The ATLAS collaboration

AU - The ALICE collaboration

PY - 2018/4/10

Y1 - 2018/4/10

N2 - A search for heavy resonances decaying into a Higgs boson (H) and a new particle (X) is reported, utilizing 36.1 fb−1 of proton–proton collision data at s=13TeV collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle X is assumed to decay to a pair of light quarks, and the fully hadronic final state XH→qq¯′bb¯ is analysed. The search considers the regime of high XH resonance masses, where the X and H bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of XH mass versus X mass is scanned for evidence of a signal, over a range of XH resonance mass values between 1 TeV and 4 TeV, and for X particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of XH and X masses, on the production cross-section of the XH→qq¯′bb¯ resonance.

AB - A search for heavy resonances decaying into a Higgs boson (H) and a new particle (X) is reported, utilizing 36.1 fb−1 of proton–proton collision data at s=13TeV collected during 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider. The particle X is assumed to decay to a pair of light quarks, and the fully hadronic final state XH→qq¯′bb¯ is analysed. The search considers the regime of high XH resonance masses, where the X and H bosons are both highly Lorentz-boosted and are each reconstructed using a single jet with large radius parameter. A two-dimensional phase space of XH mass versus X mass is scanned for evidence of a signal, over a range of XH resonance mass values between 1 TeV and 4 TeV, and for X particles with masses from 50 GeV to 1000 GeV. All search results are consistent with the expectations for the background due to Standard Model processes, and 95% CL upper limits are set, as a function of XH and X masses, on the production cross-section of the XH→qq¯′bb¯ resonance.

U2 - 10.1016/j.physletb.2018.01.042

DO - 10.1016/j.physletb.2018.01.042

M3 - Journal article

SN - 0370-2693

VL - 779

SP - 24

EP - 45

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

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

ER -

A search for resonances decaying into a Higgs boson and a new particle X in the XH -> qqbb final state with the ATLAS detector

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