GCRIS Repository Collection:
https://hdl.handle.net/20.500.11851/4280
2024-03-28T16:20:58Z
2024-03-28T16:20:58Z
Observation of WZγ Production in pp Collisions at sqrt[s]=13 TeV with the ATLAS Detector
Aad, G.
Abbott, B.
Abeling, K.
Abicht, N.J.
Abidi, S.H.
Aboulhorma, A.
Sultansoy, Saleh
https://hdl.handle.net/20.500.11851/11092
2024-03-09T15:12:42Z
2024-01-01T00:00:00Z
Title: Observation of WZγ Production in pp Collisions at sqrt[s]=13 TeV with the ATLAS Detector
Authors: Aad, G.; Abbott, B.; Abeling, K.; Abicht, N.J.; Abidi, S.H.; Aboulhorma, A.; Sultansoy, Saleh
Abstract: This Letter reports the observation of WZγ production and a measurement of its cross section using 140.1±1.2 fb^{-1} of proton-proton collision data recorded at a center-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. The WZγ production cross section, with both the W and Z bosons decaying leptonically, pp→WZγ→ℓ^{'}^{±}νℓ^{+}ℓ^{-}γ (ℓ^{(^{'})}=e, μ), is measured in a fiducial phase-space region defined such that the leptons and the photon have high transverse momentum and the photon is isolated. The cross section is found to be 2.01±0.30(stat)±0.16(syst) fb. The corresponding standard model predicted cross section calculated at next-to-leading order in perturbative quantum chromodynamics and at leading order in the electroweak coupling constant is 1.50±0.06 fb. The observed significance of the WZγ signal is 6.3σ, compared with an expected significance of 5.0σ.
2024-01-01T00:00:00Z
Observation of the Formula Presented Process in Formula Presented Collisions and Constraints on the τ-Lepton Anomalous Magnetic Moment with the ATLAS Detector
Filmer, E.K.
Jackson, P.
Kong, A.X.Y.
Potti, H.
Ruggeri, T.A.
Ting, E.X.L.
White, M.J.
https://hdl.handle.net/20.500.11851/11094
2024-03-09T15:12:43Z
2023-01-01T00:00:00Z
Title: Observation of the Formula Presented Process in Formula Presented Collisions and Constraints on the τ-Lepton Anomalous Magnetic Moment with the ATLAS Detector
Authors: Filmer, E.K.; Jackson, P.; Kong, A.X.Y.; Potti, H.; Ruggeri, T.A.; Ting, E.X.L.; White, M.J.
Abstract: This Letter reports the observation of Formula Presented-lepton-pair production in ultraperipheral lead-lead collisions Formula Presented and constraints on the Formula Presented-lepton anomalous magnetic moment Formula Presented. The dataset corresponds to an integrated luminosity of Formula Presented of LHC Formula Presented collisions at Formula Presented recorded by the ATLAS experiment in 2018. Selected events contain one muon from a Formula Presented-lepton decay, an electron or charged-particle track(s) from the other Formula Presented-lepton decay, little additional central-detector activity, and no forward neutrons. The Formula Presented process is observed in Formula Presented collisions with a significance exceeding 5 standard deviations and a signal strength of Formula Presented assuming the standard model value for Formula Presented. To measure Formula Presented, a template fit to the muon transverse-momentum distribution from Formula Presented-lepton candidates is performed, using a dimuon (Formula Presented) control sample to constrain systematic uncertainties. The observed 95% confidence-level interval for Formula Presented is Formula Presented. © 2023 CERN, for the ATLAS Collaboration.
2023-01-01T00:00:00Z
Combined Measurement of the Higgs Boson Mass from the Formula Presented and Formula Presented Decay Channels with the ATLAS Detector Using Formula Presented, 8, and 13 TeV Formula Presented Collision Data
Filmer, E.K.
Grant, C.M.
Jackson, P.
Kong, A.X.Y.
Pandya, H.D.
Potti, H.
Ruggeri, T.A.
https://hdl.handle.net/20.500.11851/11093
2024-03-09T15:12:42Z
2023-01-01T00:00:00Z
Title: Combined Measurement of the Higgs Boson Mass from the Formula Presented and Formula Presented Decay Channels with the ATLAS Detector Using Formula Presented, 8, and 13 TeV Formula Presented Collision Data
Authors: Filmer, E.K.; Grant, C.M.; Jackson, P.; Kong, A.X.Y.; Pandya, H.D.; Potti, H.; Ruggeri, T.A.
Abstract: A measurement of the mass of the Higgs boson combining the Formula Presented and Formula Presented decay channels is presented. The result is based on Formula Presented of proton-proton collision data collected by the ATLAS detector during LHC run 2 at a center-of-mass energy of 13 TeV combined with the run 1 ATLAS mass measurement, performed at center-of-mass energies of 7 and 8 TeV, yielding a Higgs boson mass of Formula Presented. This corresponds to a 0.09% precision achieved on this fundamental parameter of the Standard Model of particle physics. © 2023 CERN, for the ATLAS Collaboration.
2023-01-01T00:00:00Z
Evidence for the Higgs boson decay to a Z boson and a photon at the LHC
Aad, G.
Abbott, B.
Abeling, K.
Abicht, N.J.
Abidi, S.H.
Aboulhorma, A.
Abramowicz, H.
https://hdl.handle.net/20.500.11851/11090
2024-03-09T15:12:41Z
2024-01-01T00:00:00Z
Title: Evidence for the Higgs boson decay to a Z boson and a photon at the LHC
Authors: Aad, G.; Abbott, B.; Abeling, K.; Abicht, N.J.; Abidi, S.H.; Aboulhorma, A.; Abramowicz, H.
Abstract: The first evidence for the Higgs boson decay to a Formula Presented boson and a photon is presented, with a statistical significance of 3.4 standard deviations. The result is derived from a combined analysis of the searches performed by the ATLAS and CMS Collaborations with proton-proton collision datasets collected at the CERN Large Hadron Collider (LHC) from 2015 to 2018. These correspond to integrated luminosities of around Formula Presented for each experiment, at a center-of-mass energy of 13 TeV. The measured signal yield is Formula Presented times the standard model prediction, and agrees with the theoretical expectation within 1.9 standard deviations. © 2024 CERN, for the ATLAS and CMSs Collaboration.
2024-01-01T00:00:00Z