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Evidence for longitudinally polarized w bosons in the electroweak production of same-sign w boson pairs in association with two jets in pp collisions at √s=13  TeV with the ATLAS detector

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This Letter reports the first evidence of electroweak production of same-sign 𝑊 boson pairs where at least one of the 𝑊 bosons is longitudinally polarized and the most stringent constraint to date for the production of two longitudinally polarized same-sign 𝑊 bosons. The dataset used corresponds to...

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Main Authors: Aad, Georges (Author) , Ackermann, Anke (Author) , Backes, Mathias (Author) , Bartels, Falk (Author) , Dittmeier, Sebastian (Author) , Dunford, Monica (Author) , Franchino, Silvia (Author) , Junkermann, Thomas (Author) , Mkrtchyan, Tigran (Author) , Nandi, Abhirikshma (Author) , Rassloff, Damir Fabrice (Author) , Sanfilippo, Lorenzo (Author) , Schöning, André (Author) , Schultz-Coulon, Hans-Christian (Author) , Sothilingam, Varsiha (Author) , Stamen, Rainer (Author) , Vigani, Luigi (Author) , Wessels, Martin (Author) , Zinßer, Joachim (Author)
Corporate Author: ATLAS Collaboration (Author)
Format: Article (Journal)
Language:English
Published: 10 September, 2025
In: Physical review letters
Year: 2025, Volume: 135, Issue: 11, Pages: 1-27
ISSN:1079-7114
DOI:10.1103/bpln-ccql
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/bpln-ccql
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/bpln-ccql
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Author Notes:G. Aad et al. (ATLAS Collaboration*)
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Summary:This Letter reports the first evidence of electroweak production of same-sign 𝑊 boson pairs where at least one of the 𝑊 bosons is longitudinally polarized and the most stringent constraint to date for the production of two longitudinally polarized same-sign 𝑊 bosons. The dataset used corresponds to an integrated luminosity of 140 fb−1 of proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the ATLAS detector during run 2 of the Large Hadron Collider. The study is performed in final states including two same-sign leptons (electrons or muons), missing transverse momentum, and at least two jets with a large invariant mass and a large rapidity difference. Two independent fits are performed targeting the production of same-sign 𝑊 bosons with at least one, or two longitudinally polarized 𝑊 bosons. The observed (expected) significance of the production with at least one longitudinally polarized 𝑊 boson is 3.3 (4.0) standard deviations. An observed (expected) 95% confidence level upper limit of 0.45 (0.70) fb is reported on the fiducial production cross section of two longitudinally polarized same-sign 𝑊 bosons.
Item Description:Veröffentlicht: 10. September 2025
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*ATLAS Collaboration: G. Aad, A. Ackermann, M.J. Backes, F. Bartels, S.J. Dittmeier, M. Dunford, S. Franchino, T. Junkermann, T. Mkrtchyan, A. Nandi, D.F. Rassloff, L. Sanfilippo, A. Schoening, H.-C. Schultz-Coulon, V. Sothilingam, L. Vigani, M. Wessels, J. Zinsser [und 2902 weitere Personen]
Gesehen am 05.02.2026
Physical Description:Online Resource
ISSN:1079-7114
DOI:10.1103/bpln-ccql

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