| Title: |
Search for resonant leptoquark production via lepton-jet signatures in pp collisions at s = 13 TeV and s = 13.6 TeV with the ATLAS detector |
| Authors: |
Aad, G; Aakvaag, E; Abbott, B; Abdelhameed, S; Abeling, K; Abicht, NJ; Abidi, SH; Aboelela, M; Aboulhorma, A; Abramowicz, H; Abulaiti, Y; Acharya, BS; Ackermann, A; Adam Bourdarios, C; Adamczyk, L; Addepalli, SV; Addison, MJ; Adelman, J; Adiguzel, A; Adye, T; Affolder, AA; Afik, Y; Agaras, MN; Aggarwal, A; Barr, AJ; Bortoletto, D; Bruckler, TL; Chen, M; Conroy, EI; Cooper-Sarkar, AM; Dingley, T; Eberwein, GH; Frost, JA; Gallas, EJ; Grabarczyk, RP; Gwenlan, C; Haslbeck, F; Hays, CP; Hodkinson, BH; Homsak, V; Huffman, TB; Koch, SF; Molinatti, U; Nagai, K; Nedic, L; Nickerson, RB; Pacey, HA; Qichen, D; Rossi, E; Ruggiero, A; Shipsey, IPJ; Sultan, DMS; Tuncay, SB; Viehhauser, GHA; Wang, WT; Weidberg, AR; Yildirim, TP |
| Publisher Information: |
Springer |
| Publication Year: |
2025 |
| Collection: |
Oxford University Research Archive (ORA) |
| Description: |
This paper presents a search for physics beyond the Standard Model targeting a heavy resonance visible in the invariant mass of the lepton-jet system. The analysis focuses on final states with a high-energy lepton and jet, and is optimised for the resonant production of leptoquarks — a novel production mode mediated by the lepton content of the proton originating from quantum fluctuations. Four distinct and orthogonal final states are considered: e+light jet, μ+light jet, e+b-jet, and μ+b-jet, constituting the first search at the Large Hadron Collider for resonantly produced leptoquarks with couplings to electrons and muons. Events with an additional same-flavour lepton, as expected from higher-order diagrams in the signal process, are also included in each channel. The search uses proton-proton collision data from the full Run 2, corresponding to an integrated luminosity of 140 fb−1 at a centre-of-mass energy of s=13 TeV, and from a part of Run 3 (2022–2023), corresponding to 55 fb−1 at s=13.6 TeV. No significant excess over Standard Model predictions is observed. The results are interpreted as exclusion limits on scalar leptoquark S~1 production, substantially improving upon previous ATLAS constraints from leptoquark pair production for large coupling values. The excluded S~1 mass ranges depend on the coupling strength, reaching up to 3.4 TeV for quark-lepton couplings yde = 1.0, and up to 4.3 TeV, 3.1 TeV, and 2.8 TeV for ysμ, ybe, and ybμ couplings set to 3.5, respectively. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| Relation: |
https://doi.org/10.1007/jhep12(2025)180 |
| DOI: |
10.1007/jhep12(2025)180 |
| Availability: |
https://doi.org/10.1007/jhep12(2025)180; https://ora.ox.ac.uk/objects/uuid:90780285-a355-4bd9-91a8-1129f0ac7acd |
| Rights: |
info:eu-repo/semantics/openAccess ; CC Attribution (CC BY) |
| Accession Number: |
edsbas.EC02042B |
| Database: |
BASE |