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+ⁱℓ− (ℓ=𝑒, 𝜇). The data used were collected by the ATLAS detector during 2015 and 2016 𝑝ⁱ𝑝 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 𝑐ⁱ𝜏 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 𝑐ⁱ𝜏 approximately between 0.1 and 7 m is excluded with a 95% confidence level up to 10% for 𝑚𝑍𝑑 between 5 and 15 GeV.

Aaboud M., A.G. (2019). Search for the Production of a Long-Lived Neutral Particle Decaying within the ATLAS Hadronic Calorimeter in Association with a 𝑍 Boson from 𝑝ⁱ𝑝 Collisions at √𝑠=13  TeV. PHYSICAL REVIEW LETTERS, 122(15), 151801-1-151801-19 [10.1103/PhysRevLett.122.151801].

Search for the Production of a Long-Lived Neutral Particle Decaying within the ATLAS Hadronic Calorimeter in Association with a 𝑍 Boson from 𝑝ⁱ𝑝 Collisions at √𝑠=13  TeV

Alberghi G. L.;Bellagamba L.;Bindi M.;Boscherini D.;Cabras G.;Caforio D.;De Castro S.;Di Sipio R.;Fabbri F.;Fabbri L.;Franchini M.;Gabrielli A.;Giacobbe B.;Lasagni Manghi F.;Macchiolo A.;Massa L.;Monzani S.;Polini A.;Rinaldi L.;Romano M.;Sbarra C.;Sbrizzi A.;Semprini-Cesari N.;Sioli M.;Todome K.;Ucchielli G.;Valentinetti S.;Villa M.;Vittori C.;Vivarelli I.;Zoccoli A.;
2019

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+ⁱℓ− (ℓ=𝑒, 𝜇). The data used were collected by the ATLAS detector during 2015 and 2016 𝑝ⁱ𝑝 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 𝑐ⁱ𝜏 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 𝑐ⁱ𝜏 approximately between 0.1 and 7 m is excluded with a 95% confidence level up to 10% for 𝑚𝑍𝑑 between 5 and 15 GeV.
2019
Aaboud M., A.G. (2019). Search for the Production of a Long-Lived Neutral Particle Decaying within the ATLAS Hadronic Calorimeter in Association with a �� Boson from ��⁢�� Collisions at √��=13  TeV. PHYSICAL REVIEW LETTERS, 122(15), 151801-1-151801-19 [10.1103/PhysRevLett.122.151801].
Aaboud M., Aad G., Abbott B., Abdinov O., Abeloos B., Abhayasinghe D.K., Abidi S.H., Abouzeid O.S., Abraham N.L., Abramowicz H., Abreu H., Abulaiti Y....espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/705345
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