Search for Higgs Boson Decays into a Z Boson and a Light Hadronically Decaying Resonance Using 13 TeV pp Collision Data from the ATLAS Detector:Physical review letters

Collaboration, ATLAS and Barton, A.E. and Bertram, I.A. and Borissov, G. and Bouhova-Thacker, E.V. and Fox, H. and Henderson, R.C.W. and Jones, R.W.L. and Kartvelishvili, V. and Long, R.E. and Love, P.A. and Muenstermann, D. and Parker, A.J. and Sanderswood, Izaac and Smizanska, M. and Tee, A.S. and Walder, J. and Wharton, A.M. and Whitmore, B.W. and Yexley, Melissa (2020) Search for Higgs Boson Decays into a Z Boson and a Light Hadronically Decaying Resonance Using 13 TeV pp Collision Data from the ATLAS Detector:Physical review letters. Phys Rev Lett, 125 (22). ISSN 1079-7114

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Abstract

A search for Higgs boson decays into a Z boson and a light resonance in two-lepton plus jet events is performed, using a pp collision dataset with an integrated luminosity of 139  fb-1 collected at √s=13  TeV by the ATLAS experiment at the CERN LHC. The resonance considered is a light boson with a mass below 4 GeV from a possible extended scalar sector or a charmonium state. Multivariate discriminants are used for the event selection and for evaluating the mass of the light resonance. No excess of events above the expected background is found. Observed (expected) 95% confidence-level upper limits are set on the Higgs boson production cross section times branching fraction to a Z boson and the signal resonance, with values in the range 17-340 pb (16+6−5–320+130−90  pb) for the different light spin-0 boson mass and branching fraction hypotheses, and with values of 110 and 100 pb  (100+40−30 and 100+40−30  pb) for the ηc and J/ψ hypotheses, respectively.

Item Type:
Journal Article
Journal or Publication Title:
Phys Rev Lett
Subjects:
ID Code:
150875
Deposited By:
Deposited On:
18 Jan 2021 15:05
Refereed?:
Yes
Published?:
Published
Last Modified:
03 Mar 2021 12:05