Search for top-quark decays t → Hq with 36 fb−1 of pp collision data at √s = 13 TeV with the ATLAS detector

Standard

Search for top-quark decays t → Hq with 36 fb⁻¹ of pp collision data at √s = 13 TeV with the ATLAS detector. / The ATLAS collaboration; Бобровников, Виктор Сергеевич; Харламов, Алексей Георгиевич et al.

In: Journal of High Energy Physics, Vol. 2019, No. 5, 123, 21.05.2019.

Research output: Contribution to journal › Article › peer-review

Harvard

The ATLAS collaboration, Бобровников, ВС, Харламов, АГ & Пелеганчук, СВ 2019, 'Search for top-quark decays t → Hq with 36 fb⁻¹ of pp collision data at √s = 13 TeV with the ATLAS detector', Journal of High Energy Physics, vol. 2019, no. 5, 123. https://doi.org/10.1007/JHEP05(2019)123

APA

The ATLAS collaboration, Бобровников, В. С., Харламов, А. Г., & Пелеганчук, С. В. (2019). Search for top-quark decays t → Hq with 36 fb⁻¹ of pp collision data at √s = 13 TeV with the ATLAS detector. Journal of High Energy Physics, 2019(5), [123]. https://doi.org/10.1007/JHEP05(2019)123

Vancouver

The ATLAS collaboration, Бобровников ВС, Харламов АГ, Пелеганчук СВ. Search for top-quark decays t → Hq with 36 fb⁻¹ of pp collision data at √s = 13 TeV with the ATLAS detector. Journal of High Energy Physics. 2019 May 21;2019(5):123. doi: 10.1007/JHEP05(2019)123

Author

The ATLAS collaboration ; Бобровников, Виктор Сергеевич ; Харламов, Алексей Георгиевич et al. / Search for top-quark decays t → Hq with 36 fb⁻¹ of pp collision data at √s = 13 TeV with the ATLAS detector. In: Journal of High Energy Physics. 2019 ; Vol. 2019, No. 5.

BibTeX

@article{2d19e8b5fd164bb793eeec7e7c6ce528,

title = "Search for top-quark decays t → Hq with 36 fb−1 of pp collision data at √s = 13 TeV with the ATLAS detector",

abstract = "A search for flavour-changing neutral current decays of a top quark into an up-type quark (q = u, c) and the Standard Model Higgs boson, t → Hq, is presented. The search is based on a dataset of pp collisions at s = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 36.1 fb−1. Two complementary analyses are performed to search for top-quark pair events in which one top quark decays into Wb and the other top quark decays into Hq, and target the H→ bb¯ and H → τ+τ− decay modes, respectively. The high multiplicity of b-quark jets, or the presence of hadronically decaying τ-leptons, is exploited in the two analyses respectively. Multivariate techniques are used to separate the signal from the background, which is dominated by top-quark pair production. No significant excess of events above the background expectation is found, and 95% CL upper limits on the t → Hq branching ratios are derived. The combination of these searches with ATLAS searches in diphoton and multilepton final states yields observed (expected) 95% CL upper limits on the t → Hc and t → Hu branching ratios of 1.1 × 10−3 (8.3 × 10−4) and 1.2 × 10−3 (8.3 × 10−4), respectively. The corresponding combined observed (expected) upper limits on the |λtcH| and |λtuH| couplings are 0.064 (0.055) and 0.066 (0.055), respectively.",

keywords = "Hadron-Hadron scattering (experiments), Rare decay, Top physics, BOSON, PAIR-PRODUCTION, MASS, HIGGS, CROSS-SECTION, STANDARD, PROGRAM",

author = "{The ATLAS collaboration} and M. Aaboud and G. Aad and B. Abbott and Abbott, {D. C.} and O. Abdinov and B. Abeloos and Abhayasinghe, {D. K.} and Abidi, {S. H.} and AbouZeid, {O. S.} and Abraham, {N. L.} and H. Abramowicz and H. Abreu and Y. Abulaiti and Acharya, {B. S.} and S. Adachi and L. Adam and L. Adamczyk and L. Adamek and J. Adelman and M. Adersberger and A. Adiguzel and T. Adye and Affolder, {A. A.} and Y. Afik and C. Agheorghiesei and Aguilar-Saavedra, {J. A.} and F. Ahmadov and G. Aielli and S. Akatsuka and {\AA}kesson, {T. P.A.} and E. Akilli and Akimov, {A. V.} and Alberghi, {G. L.} and J. Albert and P. Albicocco and {Alconada Verzini}, {M. J.} and S. Alderweireldt and M. Aleksa and Anisenkov, {A. V.} and Baldin, {E. M.} and Kazanin, {V. F.} and T. Kharlamova and Maslennikov, {A. L.} and Maximov, {D. A.} and P. Podberezko and Rezanova, {O. L.} and Soukharev, {A. M.} and Talyshev, {A. A.} and Tikhonov, {Yu A.} and V. Zhulanov and Бобровников, {Виктор Сергеевич} and Харламов, {Алексей Георгиевич} and Пелеганчук, {Сергей Владимирович}",

note = "Publisher Copyright: {\textcopyright} 2019, The Author(s).",

year = "2019",

month = may,

day = "21",

doi = "10.1007/JHEP05(2019)123",

language = "English",

volume = "2019",

journal = "Journal of High Energy Physics",

issn = "1029-8479",

publisher = "Springer US",

number = "5",

}

RIS

TY - JOUR

T1 - Search for top-quark decays t → Hq with 36 fb−1 of pp collision data at √s = 13 TeV with the ATLAS detector

AU - The ATLAS collaboration

AU - Aaboud, M.

AU - Aad, G.

AU - Abbott, B.

AU - Abbott, D. C.

AU - Abdinov, O.

AU - Abeloos, B.

AU - Abhayasinghe, D. K.

AU - Abidi, S. H.

AU - AbouZeid, O. S.

AU - Abraham, N. L.

AU - Abramowicz, H.

AU - Abreu, H.

AU - Abulaiti, Y.

AU - Acharya, B. S.

AU - Adachi, S.

AU - Adam, L.

AU - Adamczyk, L.

AU - Adamek, L.

AU - Adelman, J.

AU - Adersberger, M.

AU - Adiguzel, A.

AU - Adye, T.

AU - Affolder, A. A.

AU - Afik, Y.

AU - Agheorghiesei, C.

AU - Aguilar-Saavedra, J. A.

AU - Ahmadov, F.

AU - Aielli, G.

AU - Akatsuka, S.

AU - Åkesson, T. P.A.

AU - Akilli, E.

AU - Akimov, A. V.

AU - Alberghi, G. L.

AU - Albert, J.

AU - Albicocco, P.

AU - Alconada Verzini, M. J.

AU - Alderweireldt, S.

AU - Aleksa, M.

AU - Anisenkov, A. V.

AU - Baldin, E. M.

AU - Kazanin, V. F.

AU - Kharlamova, T.

AU - Maslennikov, A. L.

AU - Maximov, D. A.

AU - Podberezko, P.

AU - Rezanova, O. L.

AU - Soukharev, A. M.

AU - Talyshev, A. A.

AU - Tikhonov, Yu A.

AU - Zhulanov, V.

AU - Бобровников, Виктор Сергеевич

AU - Харламов, Алексей Георгиевич

AU - Пелеганчук, Сергей Владимирович

PY - 2019/5/21

Y1 - 2019/5/21

N2 - A search for flavour-changing neutral current decays of a top quark into an up-type quark (q = u, c) and the Standard Model Higgs boson, t → Hq, is presented. The search is based on a dataset of pp collisions at s = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 36.1 fb−1. Two complementary analyses are performed to search for top-quark pair events in which one top quark decays into Wb and the other top quark decays into Hq, and target the H→ bb¯ and H → τ+τ− decay modes, respectively. The high multiplicity of b-quark jets, or the presence of hadronically decaying τ-leptons, is exploited in the two analyses respectively. Multivariate techniques are used to separate the signal from the background, which is dominated by top-quark pair production. No significant excess of events above the background expectation is found, and 95% CL upper limits on the t → Hq branching ratios are derived. The combination of these searches with ATLAS searches in diphoton and multilepton final states yields observed (expected) 95% CL upper limits on the t → Hc and t → Hu branching ratios of 1.1 × 10−3 (8.3 × 10−4) and 1.2 × 10−3 (8.3 × 10−4), respectively. The corresponding combined observed (expected) upper limits on the |λtcH| and |λtuH| couplings are 0.064 (0.055) and 0.066 (0.055), respectively.

AB - A search for flavour-changing neutral current decays of a top quark into an up-type quark (q = u, c) and the Standard Model Higgs boson, t → Hq, is presented. The search is based on a dataset of pp collisions at s = 13 TeV recorded in 2015 and 2016 with the ATLAS detector at the CERN Large Hadron Collider and corresponding to an integrated luminosity of 36.1 fb−1. Two complementary analyses are performed to search for top-quark pair events in which one top quark decays into Wb and the other top quark decays into Hq, and target the H→ bb¯ and H → τ+τ− decay modes, respectively. The high multiplicity of b-quark jets, or the presence of hadronically decaying τ-leptons, is exploited in the two analyses respectively. Multivariate techniques are used to separate the signal from the background, which is dominated by top-quark pair production. No significant excess of events above the background expectation is found, and 95% CL upper limits on the t → Hq branching ratios are derived. The combination of these searches with ATLAS searches in diphoton and multilepton final states yields observed (expected) 95% CL upper limits on the t → Hc and t → Hu branching ratios of 1.1 × 10−3 (8.3 × 10−4) and 1.2 × 10−3 (8.3 × 10−4), respectively. The corresponding combined observed (expected) upper limits on the |λtcH| and |λtuH| couplings are 0.064 (0.055) and 0.066 (0.055), respectively.

KW - Hadron-Hadron scattering (experiments)

KW - Rare decay

KW - Top physics

KW - BOSON

KW - PAIR-PRODUCTION

KW - MASS

KW - HIGGS

KW - CROSS-SECTION

KW - STANDARD

KW - PROGRAM

UR - http://www.scopus.com/inward/record.url?scp=85066135451&partnerID=8YFLogxK

U2 - 10.1007/JHEP05(2019)123

DO - 10.1007/JHEP05(2019)123

M3 - Article

AN - SCOPUS:85066135451

VL - 2019

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 5

M1 - 123

ER -

ID: 20165861