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Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $$\sqrt{s}=13$$ TeV proton–proton collisions with the ATLAS detector

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Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $$\sqrt{s}=13$$ TeV proton–proton collisions with the ATLAS detector. / The ATLAS collaboration ; Fernandez Barbadillo, Beltran.
In: European Physical Journal C: Particles and Fields, Vol. 85, No. 8, 886, 31.08.2025.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

The ATLAS collaboration & Fernandez Barbadillo, B 2025, 'Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $$\sqrt{s}=13$$ TeV proton–proton collisions with the ATLAS detector', European Physical Journal C: Particles and Fields, vol. 85, no. 8, 886. https://doi.org/10.1140/epjc/s10052-025-14507-0

APA

The ATLAS collaboration, & Fernandez Barbadillo, B. (2025). Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $$\sqrt{s}=13$$ TeV proton–proton collisions with the ATLAS detector. European Physical Journal C: Particles and Fields, 85(8), Article 886. https://doi.org/10.1140/epjc/s10052-025-14507-0

Vancouver

The ATLAS collaboration, Fernandez Barbadillo B. Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $$\sqrt{s}=13$$ TeV proton–proton collisions with the ATLAS detector. European Physical Journal C: Particles and Fields. 2025 Aug 31;85(8):886. Epub 2025 Aug 19. doi: 10.1140/epjc/s10052-025-14507-0

Author

The ATLAS collaboration ; Fernandez Barbadillo, Beltran. / Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $$\sqrt{s}=13$$ TeV proton–proton collisions with the ATLAS detector. In: European Physical Journal C: Particles and Fields. 2025 ; Vol. 85, No. 8.

Bibtex

@article{7213934d67604c0e931e5013d0cff386,
title = "Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $$\sqrt{s}=13$$ TeV proton{\^a}€“proton collisions with the ATLAS detector",
abstract = "A search for a pseudoscalar a produced in association with a top-quark pair, or in association with a single top quark plus a W boson, with the pseudoscalar decaying into b-quarks ( $$a\rightarrow b\bar{b}$$ a {\^a}†{\textquoteright} b b {\^A}¯ ), is performed using the full Run 2 data sample using a dileptonic decay mode signature. The search covers pseudoscalar boson masses between 12 and 100 GeV and involves both the kinematic regime where the decay products of the pseudoscalar are reconstructed as two standard b-tagged small-radius jets, or merged into a large-radius jet due to its Lorentz boost. No significant excess relative to expectations is observed. Assuming a branching ratio $$\text {BR}(a\rightarrow b\bar{b})=100\% $$ BR ( a {\^a}†{\textquoteright} b b {\^A}¯ ) = 100 % , the range of pseudoscalar masses between 50 and 80 GeV is excluded at 95% confidence level for a coupling of the pseudoscalar to the top quark of 0.5, while a coupling of 1.0 is excluded at 95% confidence level for the masses considered, with the coupling defined as the strength modifier of the Standard Model Yukawa coupling.",
author = "{The ATLAS collaboration} and Hanadi Ali and Zainab Alsolami and A.E. Barton and G. Borissov and E.V. Bouhova-Thacker and {Fernandez Barbadillo}, Beltran and James Ferrando and H. Fox and Alina Hagan and R.W.L. Jones and V. Kartvelishvili and P.A. Love and Marshall, {Emma J.} and Luke McElhinney and L. Meng and Elliot Sampson and M. Smizanska and A.M. Wharton",
year = "2025",
month = aug,
day = "31",
doi = "10.1140/epjc/s10052-025-14507-0",
language = "English",
volume = "85",
journal = "European Physical Journal C: Particles and Fields",
issn = "1434-6044",
publisher = "SPRINGER",
number = "8",

}

RIS

TY - JOUR

T1 - Search for a new pseudoscalar decaying into a pair of bottom and antibottom quarks in top-associated production in $$\sqrt{s}=13$$ TeV proton–proton collisions with the ATLAS detector

AU - The ATLAS collaboration

AU - Ali, Hanadi

AU - Alsolami, Zainab

AU - Barton, A.E.

AU - Borissov, G.

AU - Bouhova-Thacker, E.V.

AU - Fernandez Barbadillo, Beltran

AU - Ferrando, James

AU - Fox, H.

AU - Hagan, Alina

AU - Jones, R.W.L.

AU - Kartvelishvili, V.

AU - Love, P.A.

AU - Marshall, Emma J.

AU - McElhinney, Luke

AU - Meng, L.

AU - Sampson, Elliot

AU - Smizanska, M.

AU - Wharton, A.M.

PY - 2025/8/31

Y1 - 2025/8/31

N2 - A search for a pseudoscalar a produced in association with a top-quark pair, or in association with a single top quark plus a W boson, with the pseudoscalar decaying into b-quarks ( $$a\rightarrow b\bar{b}$$ a → b b ¯ ), is performed using the full Run 2 data sample using a dileptonic decay mode signature. The search covers pseudoscalar boson masses between 12 and 100 GeV and involves both the kinematic regime where the decay products of the pseudoscalar are reconstructed as two standard b-tagged small-radius jets, or merged into a large-radius jet due to its Lorentz boost. No significant excess relative to expectations is observed. Assuming a branching ratio $$\text {BR}(a\rightarrow b\bar{b})=100\% $$ BR ( a → b b ¯ ) = 100 % , the range of pseudoscalar masses between 50 and 80 GeV is excluded at 95% confidence level for a coupling of the pseudoscalar to the top quark of 0.5, while a coupling of 1.0 is excluded at 95% confidence level for the masses considered, with the coupling defined as the strength modifier of the Standard Model Yukawa coupling.

AB - A search for a pseudoscalar a produced in association with a top-quark pair, or in association with a single top quark plus a W boson, with the pseudoscalar decaying into b-quarks ( $$a\rightarrow b\bar{b}$$ a → b b ¯ ), is performed using the full Run 2 data sample using a dileptonic decay mode signature. The search covers pseudoscalar boson masses between 12 and 100 GeV and involves both the kinematic regime where the decay products of the pseudoscalar are reconstructed as two standard b-tagged small-radius jets, or merged into a large-radius jet due to its Lorentz boost. No significant excess relative to expectations is observed. Assuming a branching ratio $$\text {BR}(a\rightarrow b\bar{b})=100\% $$ BR ( a → b b ¯ ) = 100 % , the range of pseudoscalar masses between 50 and 80 GeV is excluded at 95% confidence level for a coupling of the pseudoscalar to the top quark of 0.5, while a coupling of 1.0 is excluded at 95% confidence level for the masses considered, with the coupling defined as the strength modifier of the Standard Model Yukawa coupling.

U2 - 10.1140/epjc/s10052-025-14507-0

DO - 10.1140/epjc/s10052-025-14507-0

M3 - Journal article

VL - 85

JO - European Physical Journal C: Particles and Fields

JF - European Physical Journal C: Particles and Fields

SN - 1434-6044

IS - 8

M1 - 886

ER -