Evidence of off-shell Higgs boson production from ZZ leptonic decay channels and constraints on its total width with the ATLAS detector
eScholarship, University of California, 2023
academicJournal
Zugriff:
This Letter reports on a search for off-shell production of the Higgs boson using 139 fb−1 of pp collision data at s= 13 TeV collected by the ATLAS detector at the Large Hadron Collider. The signature is a pair of Z bosons, with contributions from both the production and subsequent decay of a virtual Higgs boson and the interference of that process with other processes. The two observable final states are ZZ→4ℓ and ZZ→2ℓ2ν with ℓ=e or μ. In the ZZ→4ℓ final state, a dense Neural Network is used to enhance analysis sensitivity with respect to matrix element-based discrimination. The background-only hypothesis is rejected with an observed (expected) significance of 3.3 (2.2) standard deviations, representing experimental evidence for off-shell Higgs boson production. Assuming that no new particles enter the production of the virtual Higgs boson, its total width can be deduced from the measurement of its off-shell production cross-section. The measured total width of the Higgs boson is 4.5−2.5+3.3 MeV, and the observed (expected) upper limit on the total width is found to be 10.5 (10.9) MeV at 95% confidence level.
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Evidence of off-shell Higgs boson production from ZZ leptonic decay channels and constraints on its total width with the ATLAS detector
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Autor/in / Beteiligte Person: | Aad, G ; Abbott, B ; Abeling, K ; Abidi, SH ; Aboulhorma, A ; Abramowicz, H ; Abreu, H ; Abulaiti, Y ; Hoffman, AC Abusleme ; Acharya, BS ; Bourdarios, C Adam ; Adamczyk, L ; Adamek, L ; Addepalli, SV ; Adelman, J ; Adiguzel, A ; Adorni, S ; Adye, T ; Affolder, AA ; Afik, Y ; Agaras, MN ; Agarwala, J ; Aggarwal, A ; Agheorghiesei, C ; Aguilar-Saavedra, JA ; Ahmad, A ; Ahmadov, F ; Ahmed, WS ; Ahuja, S ; Ai, X ; Aielli, G ; Tamlihat, M Ait ; Aitbenchikh, B ; Aizenberg, I ; Akbiyik, M ; Åkesson, TPA ; Akimov, AV ; Akolkar, NN ; Khoury, K Al ; Alberghi, GL ; Albert, J ; Albicocco, P ; Alderweireldt, S ; Aleksa, M ; Aleksandrov, IN ; Alexa, C ; Alexopoulos, T ; Alfonsi, A ; Alfonsi, F ; Alhroob, M ; Ali, B ; Ali, S ; Aliev, M ; Alimonti, G ; Alkakhi, W ; Allaire, C ; Allbrooke, BMM ; Flores, CA Allendes ; Allport, PP ; Aloisio, A ; Alonso, F ; Alpigiani, C ; Estevez, M Alvarez ; Fernandez, A Alvarez ; Alviggi, MG ; Aly, M ; Coutinho, Y Amaral ; Ambler, A ; Amelung, C ; Amerl, M ; Ames, CG ; Amidei, D ; Dos Santos, SP Amor ; Amos, KR ; Ananiev, V ; Anastopoulos, C ; Andeen, T ; Anders, JK ; Andrean, SY ; Andreazza, A ; Angelidakis, S ; Angerami, A ; Anisenkov, AV ; Annovi, A ; Antel, C ; Anthony, MT ; Antipov, E ; Antonelli, M ; Antrim, DJA ; Anulli, F ; Aoki, M ; Aoki, T ; Pozo, JA Aparisi ; Aparo, MA ; Bella, L Aperio ; Appelt, C ; Aranzabal, N ; Ferraz, V Araujo ; Arcangeletti, C ; Arce, ATH |
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Veröffentlichung: | eScholarship, University of California, 2023 |
Medientyp: | academicJournal |
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