Measurement of the Z boson invisible width at √s=13 TeV with the ATLAS detector

ATLAS Collaboration; Phil Allport; Adrien Auriol; Panagiotis Bellos; Gareth Bird; Juraj Bracinik; David Charlton; Andrew Chisholm; Harry Cooke; Will George; Laura Gonella; Francesco Gonnella; Chris Hawkes; Stephen Hillier; Karol Krizka; Josh Lomas; Mihaela Marinescu; Thomas Neep; Paul Newman; Konstantinos Nikolopoulos; J. M. Silva; Eleni Skorda; Alexis Stampekis; Jurgen Thomas; Paul Thompson; Gov Virdee; Robert Ward; Alan Watson; Miriam Watson; Chonghao Wu

doi:10.1016/j.physletb.2024.138705

Measurement of the Z boson invisible width at √s=13 TeV with the ATLAS detector

ATLAS Collaboration, Phil Allport, Adrien Auriol, Panagiotis Bellos, Gareth Bird, Juraj Bracinik, David Charlton, Andrew Chisholm, Harry Cooke, Will George, Laura Gonella, Francesco Gonnella, Chris Hawkes, Stephen Hillier, Karol Krizka, Josh Lomas, Mihaela Marinescu, Thomas Neep, Paul Newman, Konstantinos NikolopoulosJ. M. Silva, Eleni Skorda, Alexis Stampekis, Jurgen Thomas, Paul Thompson, Gov Virdee, Robert Ward, Alan Watson, Miriam Watson, Chonghao Wu

Physics and Astronomy

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Abstract

A measurement of the invisible width of the Z boson using events with jets and missing transverse momentum is presented using 37 fb⁻¹ of 13 TeV proton-proton data collected by the ATLAS detector in 2015 and 2016. The ratio of Z→inv to Z→ℓℓ events, where inv refers to non-detected particles and ℓ is either an electron or a muon, is measured and corrected for detector effects. Events with at least one energetic central jet with p_T≥110 GeV are selected for both the Z→inv and Z→ℓℓ final states to obtain a similar phase space in the ratio. The invisible width is measured to be 506±2 (stat.) ±12 (syst.) MeV and is the single most precise recoil-based measurement. The result is in agreement with the most precise determination from LEP and the Standard Model prediction based on three neutrino generations.

Original language	English
Article number	138705
Number of pages	25
Journal	Physics Letters B
Volume	854
Early online date	10 May 2024
DOIs	https://doi.org/10.1016/j.physletb.2024.138705
Publication status	Published - Jul 2024

Bibliographical note

41 pages in total, author list starting page 24, 7 figures, 1 table, published in Phys. Lett. B 854 (2024) 138705. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-01

Keywords

hep-ex

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ATLAS2024MeasurementZFinal published version, 3.92 MBLicence: Creative Commons: Attribution (CC BY)

Cite this

ATLAS Collaboration, Allport, P., Auriol, A., Bellos, P., Bird, G., Bracinik, J., Charlton, D., Chisholm, A., Cooke, H., George, W., Gonella, L., Gonnella, F., Hawkes, C., Hillier, S., Krizka, K., Lomas, J., Marinescu, M., Neep, T., Newman, P., ... Wu, C. (2024). Measurement of the Z boson invisible width at √s=13 TeV with the ATLAS detector. Physics Letters B, 854, Article 138705. https://doi.org/10.1016/j.physletb.2024.138705

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title = "Measurement of the Z boson invisible width at √s=13 TeV with the ATLAS detector",

abstract = " A measurement of the invisible width of the Z boson using events with jets and missing transverse momentum is presented using 37 fb−1 of 13 TeV proton-proton data collected by the ATLAS detector in 2015 and 2016. The ratio of Z→inv to Z→ℓℓ events, where inv refers to non-detected particles and ℓ is either an electron or a muon, is measured and corrected for detector effects. Events with at least one energetic central jet with pT≥110 GeV are selected for both the Z→inv and Z→ℓℓ final states to obtain a similar phase space in the ratio. The invisible width is measured to be 506±2 (stat.) ±12 (syst.) MeV and is the single most precise recoil-based measurement. The result is in agreement with the most precise determination from LEP and the Standard Model prediction based on three neutrino generations.",

keywords = "hep-ex",

author = "{ATLAS Collaboration} and Phil Allport and Adrien Auriol and Panagiotis Bellos and Gareth Bird and Juraj Bracinik and David Charlton and Andrew Chisholm and Harry Cooke and Will George and Laura Gonella and Francesco Gonnella and Chris Hawkes and Stephen Hillier and Karol Krizka and Josh Lomas and Mihaela Marinescu and Thomas Neep and Paul Newman and Konstantinos Nikolopoulos and Silva, {J. M.} and Eleni Skorda and Alexis Stampekis and Jurgen Thomas and Paul Thompson and Gov Virdee and Robert Ward and Alan Watson and Miriam Watson and Chonghao Wu",

note = "41 pages in total, author list starting page 24, 7 figures, 1 table, published in Phys. Lett. B 854 (2024) 138705. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-01",

year = "2024",

month = jul,

doi = "10.1016/j.physletb.2024.138705",

language = "English",

volume = "854",

journal = "Physics Letters B",

issn = "0370-2693",

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ATLAS Collaboration, Allport, P, Auriol, A, Bellos, P, Bird, G, Bracinik, J , Charlton, D , Chisholm, A, Cooke, H, George, W, Gonella, L, Gonnella, F, Hawkes, C, Hillier, S , Krizka, K, Lomas, J, Marinescu, M, Neep, T , Newman, P , Nikolopoulos, K, Silva, JM, Skorda, E, Stampekis, A, Thomas, J , Thompson, P, Virdee, G, Ward, R, Watson, A , Watson, M & Wu, C 2024, 'Measurement of the Z boson invisible width at √s=13 TeV with the ATLAS detector', Physics Letters B, vol. 854, 138705. https://doi.org/10.1016/j.physletb.2024.138705

TY - JOUR

T1 - Measurement of the Z boson invisible width at √s=13 TeV with the ATLAS detector

AU - ATLAS Collaboration

AU - Allport, Phil

AU - Auriol, Adrien

AU - Bellos, Panagiotis

AU - Bird, Gareth

AU - Bracinik, Juraj

AU - Charlton, David

AU - Chisholm, Andrew

AU - Cooke, Harry

AU - George, Will

AU - Gonella, Laura

AU - Gonnella, Francesco

AU - Hawkes, Chris

AU - Hillier, Stephen

AU - Krizka, Karol

AU - Lomas, Josh

AU - Marinescu, Mihaela

AU - Neep, Thomas

AU - Newman, Paul

AU - Nikolopoulos, Konstantinos

AU - Silva, J. M.

AU - Skorda, Eleni

AU - Stampekis, Alexis

AU - Thomas, Jurgen

AU - Thompson, Paul

AU - Virdee, Gov

AU - Ward, Robert

AU - Watson, Alan

AU - Watson, Miriam

AU - Wu, Chonghao

N1 - 41 pages in total, author list starting page 24, 7 figures, 1 table, published in Phys. Lett. B 854 (2024) 138705. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/STDM-2019-01

PY - 2024/7

Y1 - 2024/7

N2 - A measurement of the invisible width of the Z boson using events with jets and missing transverse momentum is presented using 37 fb−1 of 13 TeV proton-proton data collected by the ATLAS detector in 2015 and 2016. The ratio of Z→inv to Z→ℓℓ events, where inv refers to non-detected particles and ℓ is either an electron or a muon, is measured and corrected for detector effects. Events with at least one energetic central jet with pT≥110 GeV are selected for both the Z→inv and Z→ℓℓ final states to obtain a similar phase space in the ratio. The invisible width is measured to be 506±2 (stat.) ±12 (syst.) MeV and is the single most precise recoil-based measurement. The result is in agreement with the most precise determination from LEP and the Standard Model prediction based on three neutrino generations.

AB - A measurement of the invisible width of the Z boson using events with jets and missing transverse momentum is presented using 37 fb−1 of 13 TeV proton-proton data collected by the ATLAS detector in 2015 and 2016. The ratio of Z→inv to Z→ℓℓ events, where inv refers to non-detected particles and ℓ is either an electron or a muon, is measured and corrected for detector effects. Events with at least one energetic central jet with pT≥110 GeV are selected for both the Z→inv and Z→ℓℓ final states to obtain a similar phase space in the ratio. The invisible width is measured to be 506±2 (stat.) ±12 (syst.) MeV and is the single most precise recoil-based measurement. The result is in agreement with the most precise determination from LEP and the Standard Model prediction based on three neutrino generations.

KW - hep-ex

U2 - 10.1016/j.physletb.2024.138705

DO - 10.1016/j.physletb.2024.138705

M3 - Article

SN - 0370-2693

VL - 854

JO - Physics Letters B

JF - Physics Letters B

M1 - 138705

ER -

Measurement of the Z boson invisible width at √s=13 TeV with the ATLAS detector

Abstract

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