Studies of the Energy Dependence of Diboson Polarization Fractions and the Radiation-Amplitude-Zero Effect in WZ Production with the ATLAS Detector

Physics

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Experimental Particle Physics

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https://doi.org/10.1103/physrevlett.133.101802
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Studies of the Energy Dependence of Diboson Polarization Fractions and the Radiation-Amplitude-Zero Effect in WZ Production with the ATLAS Detector. / The ATLAS collaboration.
In: Physical review letters, Vol. 133, No. 10, 101802, 06.09.2024.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{37815928568d4027b032b7665f002f8e,

title = "Studies of the Energy Dependence of Diboson Polarization Fractions and the Radiation-Amplitude-Zero Effect in WZ Production with the ATLAS Detector",

abstract = "This Letter presents the first study of the energy dependence of diboson polarization fractions in WZ {\^a}†{\textquoteright} {\^a}„“{\^I}½{\^a}„“{\^a}€²{\^a}„“{\^a}€²({\^a}„“,{\^a}„“{\^a}€² = e; {\^I}¼) production. The dataset used corresponds to an integrated luminosity of 140 fb {\^a}ˆ{\textquoteright}1 of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector. Two fiducial regions with an enhanced presence of events featuring two longitudinally polarized bosons are defined. A nonzero fraction of events with two longitudinally polarized bosons is measured with an observed significance of 5.3 standard deviations in the region with 100 < p Z T {\^a}‰¤ 200 GeV and 1.6 standard deviations in the region with p Z T > 200 GeV, where p Z T is the transverse momentum of the Z boson. This Letter also reports the first study of the radiation-amplitude-zero effect. Events with two transversely polarized bosons are analyzed for the {\^I}”Y({\^a}„“ WZ) and {\^I}”Y{\^a}„“WZ) distributions defined respectively as the rapidity difference between the lepton from the W boson decay and the Z boson and the rapidity difference between the W boson and the Z boson. Significant suppression of events near zero is observed in both distributions. Unfolded {\^I}”Y({\^a}„“ WZ) and {\^I}”Y(WZ) distributions are also measured and compared to theoretical predictions.",

author = "{The ATLAS collaboration} and Hanadi Ali and A.E. Barton and G. Borissov and E.V. Bouhova-Thacker and Ruby Ferguson and James Ferrando and H. Fox and Alina Hagan and R.C.W. Henderson and R.W.L. Jones and V. Kartvelishvili and P.A. Love and E.J. Marshall and L. Meng and D. Muenstermann and N. Ribaric and K. Rybacki and Elliot Sampson and M. Smizanska and S. Spinali and A.M. Wharton",

note = "M1 - 101802",

year = "2024",

month = sep,

day = "6",

doi = "10.1103/physrevlett.133.101802",

language = "English",

volume = "133",

journal = "Physical review letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "10",

}

RIS

TY - JOUR

T1 - Studies of the Energy Dependence of Diboson Polarization Fractions and the Radiation-Amplitude-Zero Effect in WZ Production with the ATLAS Detector

AU - The ATLAS collaboration

AU - Ali, Hanadi

AU - Barton, A.E.

AU - Borissov, G.

AU - Bouhova-Thacker, E.V.

AU - Ferguson, Ruby

AU - Ferrando, James

AU - Fox, H.

AU - Hagan, Alina

AU - Henderson, R.C.W.

AU - Jones, R.W.L.

AU - Kartvelishvili, V.

AU - Love, P.A.

AU - Marshall, E.J.

AU - Meng, L.

AU - Muenstermann, D.

AU - Ribaric, N.

AU - Rybacki, K.

AU - Sampson, Elliot

AU - Smizanska, M.

AU - Spinali, S.

AU - Wharton, A.M.

N1 - M1 - 101802

PY - 2024/9/6

Y1 - 2024/9/6

N2 - This Letter presents the first study of the energy dependence of diboson polarization fractions in WZ â†’ â„“Î½â„“â€²â„“â€²(â„“,â„“â€² = e; Î¼) production. The dataset used corresponds to an integrated luminosity of 140 fb âˆ’1 of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector. Two fiducial regions with an enhanced presence of events featuring two longitudinally polarized bosons are defined. A nonzero fraction of events with two longitudinally polarized bosons is measured with an observed significance of 5.3 standard deviations in the region with 100 < p Z T â‰¤ 200 GeV and 1.6 standard deviations in the region with p Z T > 200 GeV, where p Z T is the transverse momentum of the Z boson. This Letter also reports the first study of the radiation-amplitude-zero effect. Events with two transversely polarized bosons are analyzed for the Î”Y(â„“ WZ) and Î”Yâ„“WZ) distributions defined respectively as the rapidity difference between the lepton from the W boson decay and the Z boson and the rapidity difference between the W boson and the Z boson. Significant suppression of events near zero is observed in both distributions. Unfolded Î”Y(â„“ WZ) and Î”Y(WZ) distributions are also measured and compared to theoretical predictions.

AB - This Letter presents the first study of the energy dependence of diboson polarization fractions in WZ â†’ â„“Î½â„“â€²â„“â€²(â„“,â„“â€² = e; Î¼) production. The dataset used corresponds to an integrated luminosity of 140 fb âˆ’1 of proton-proton collisions at a center-of-mass energy of 13 TeV recorded by the ATLAS detector. Two fiducial regions with an enhanced presence of events featuring two longitudinally polarized bosons are defined. A nonzero fraction of events with two longitudinally polarized bosons is measured with an observed significance of 5.3 standard deviations in the region with 100 < p Z T â‰¤ 200 GeV and 1.6 standard deviations in the region with p Z T > 200 GeV, where p Z T is the transverse momentum of the Z boson. This Letter also reports the first study of the radiation-amplitude-zero effect. Events with two transversely polarized bosons are analyzed for the Î”Y(â„“ WZ) and Î”Yâ„“WZ) distributions defined respectively as the rapidity difference between the lepton from the W boson decay and the Z boson and the rapidity difference between the W boson and the Z boson. Significant suppression of events near zero is observed in both distributions. Unfolded Î”Y(â„“ WZ) and Î”Y(WZ) distributions are also measured and compared to theoretical predictions.

U2 - 10.1103/physrevlett.133.101802

DO - 10.1103/physrevlett.133.101802

M3 - Journal article

VL - 133

JO - Physical review letters

JF - Physical review letters

SN - 0031-9007

IS - 10

M1 - 101802

ER -

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