Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/123768
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Type: Journal article
Title: Search for the production of a long-lived neutral particle decaying within the ATLAS hadronic calorimeter in association with a Z boson from pp collisions at √s = 13 TeV
Other Titles: Search for the production of a long-lived neutral particle decaying within the ATLAS hadronic calorimeter in association with a Z boson from pp collisions at root s = 13 TeV
Author: Aaboud, M.
Aad, G.
Abbott, B.
Abdinov, O.
Abeloos, B.
Abhayasinghe, D.
Abidi, S.
AbouZeid, O.
Abraham, N.
Abramowicz, H.
Abreu, H.
Abulaiti, Y.
Acharya, B.
Adachi, S.
Adam, L.
Adamczyk, L.
Adelman, J.
Adersberger, M.
Adiguzel, A.
Adye, T.
et al.
Citation: Physical Review Letters, 2019; 122(15):151801-1-151801-19
Publisher: American Physical Society
Issue Date: 2019
ISSN: 0031-9007
1079-7114
Statement of
Responsibility: 
M. Aaboud … A. Duvnjak … P. Jackson … J.L. Oliver … A. Petridis … A. Qureshi … A.S. Sharma … M.J. White … et al. [The ATLAS Collaboration]
Abstract: This Letter presents a search for the production of a long-lived neutral particle (Zd) decaying within the ATLAS hadronic calorimeter, in association with a standard model (SM) Z boson produced via an intermediate scalar boson, where Z→ℓ⁺ℓ⁻ (ℓ=e, μ). The data used were collected by the ATLAS detector during 2015 and 2016 pp collisions with a center-of-mass energy of √s = 13  TeV at the Large Hadron Collider and correspond to an integrated luminosity of 36.1±0.8  fb⁻¹. No significant excess of events is observed above the expected background. Limits on the production cross section of the scalar boson times its decay branching fraction into the long-lived neutral particle are derived as a function of the mass of the intermediate scalar boson, the mass of the long-lived neutral particle, and its cτ from a few centimeters to one hundred meters. In the case that the intermediate scalar boson is the SM Higgs boson, its decay branching fraction to a long-lived neutral particle with a cτ approximately between 0.1 and 7 m is excluded with a 95% confidence level up to 10% for mZd between 5 and 15 GeV.
Keywords: ATLAS Collaboration
Rights: © 2019 CERN, for the ATLAS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.
RMID: 0030113544
DOI: 10.1103/PhysRevLett.122.151801
Appears in Collections:Physics publications

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