A search is presented for the pair-production of heavy vector-like quarks in the lepton+jets final state using 140 fb−1 of proton–proton collisions at √𝑠 = 13 TeV collected with the ATLAS detector. The search is optimised for vector-like top-quarks (𝑇 ) that decay into a 𝑊 boson and a 𝑏-quark, with one 𝑊 boson decaying leptonically and the other hadronically. Other vector-like quark flavours and decay modes are also considered. Events are selected with one high transverse-momentum electron or muon, large missing transverse momentum, a largeradius jet identified as a 𝑊 boson, and multiple small-radius jets, at least one of which is 𝑏-tagged. Vector-like 𝑇 -quarks with 100% branching ratio to 𝑊 𝑏 are excluded at 95% CL for masses below 1700 GeV. These limits are also applied to vector-like 𝑌 -quarks, which decay exclusively into a 𝑊 boson and a 𝑏-quark. Isospin singlets with B(𝑇 → 𝑊 𝑏 ∶ 𝐻 𝑡 ∶ 𝑍𝑡) = 1∕2 ∶ 1∕4 ∶ 1∕4 are excluded for masses below 1360 GeV.

Aad, G., Abbott, B., Abeling, K., Abicht, N.J., Abidi, S.H., Aboulhorma, A., et al. (2024). Search for pair-production of vector-like quarks in lepton+jets final states containing at least one 𝑏-tagged jet using the Run 2 data from the ATLAS experiment. PHYSICS LETTERS. SECTION B, 854, 1-28 [10.1016/j.physletb.2024.138743].

Search for pair-production of vector-like quarks in lepton+jets final states containing at least one 𝑏-tagged jet using the Run 2 data from the ATLAS experiment

Alberghi, G. L.;Alfonsi, F.;Ballabene, E.;Bellagamba, L.;Bianco, G.;Boscherini, D.;Bruni, A.;Carratta, G.;Cremonini, D.;De Castro, S.;Fabbri, F.;Fabbri, L.;Franchini, M.;Gabrielli, A.;Giacobbe, B.;Lasagni Manghi, F.;Levrini, G.;Polini, A.;Rinaldi, L.;Romano, M.;Sbarra, C.;Sbrizzi, A.;Semprini-Cesari, N.;Sioli, M.;Todome, K.;Valentinetti, S.;Villa, M.;Vittori, C.;Vivarelli, I.;Zoccoli, A.;
2024

Abstract

A search is presented for the pair-production of heavy vector-like quarks in the lepton+jets final state using 140 fb−1 of proton–proton collisions at √𝑠 = 13 TeV collected with the ATLAS detector. The search is optimised for vector-like top-quarks (𝑇 ) that decay into a 𝑊 boson and a 𝑏-quark, with one 𝑊 boson decaying leptonically and the other hadronically. Other vector-like quark flavours and decay modes are also considered. Events are selected with one high transverse-momentum electron or muon, large missing transverse momentum, a largeradius jet identified as a 𝑊 boson, and multiple small-radius jets, at least one of which is 𝑏-tagged. Vector-like 𝑇 -quarks with 100% branching ratio to 𝑊 𝑏 are excluded at 95% CL for masses below 1700 GeV. These limits are also applied to vector-like 𝑌 -quarks, which decay exclusively into a 𝑊 boson and a 𝑏-quark. Isospin singlets with B(𝑇 → 𝑊 𝑏 ∶ 𝐻 𝑡 ∶ 𝑍𝑡) = 1∕2 ∶ 1∕4 ∶ 1∕4 are excluded for masses below 1360 GeV.
2024
Aad, G., Abbott, B., Abeling, K., Abicht, N.J., Abidi, S.H., Aboulhorma, A., et al. (2024). Search for pair-production of vector-like quarks in lepton+jets final states containing at least one ��-tagged jet using the Run 2 data from the ATLAS experiment. PHYSICS LETTERS. SECTION B, 854, 1-28 [10.1016/j.physletb.2024.138743].
Aad, G.; Abbott, B.; Abeling, K.; Abicht, N. J.; Abidi, S. H.; Aboulhorma, A.; Abramowicz, H.; Abreu, H.; Abulaiti, Y.; Acharya, B. S.; Adam Bourdario...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1007446
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