Search for resonant t(t)over-bar production in proton-proton collisions at root s=13 TeV



Sirunyan, AM, Tumasyan, A, Adam, W, Ambrogi, F, Asilar, E, Bergauer, T, Brandstetter, J, Dragicevic, M, Eroe, J, Del Valle, A Escalante
et al (show 2276 more authors) (2019) Search for resonant t(t)over-bar production in proton-proton collisions at root s=13 TeV. JOURNAL OF HIGH ENERGY PHYSICS, 2019 (4). 31-.

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>A search for a heavy resonance decaying into a top quark and antiquark <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \left(\mathrm{t}\overline{\mathrm{t}}\right) $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfenced> <mml:mrow> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:mrow> </mml:mfenced> </mml:math> </jats:alternatives> </jats:inline-formula> pair is performed using proton-proton collisions at <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \sqrt{s}=13 $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> <mml:mo>=</mml:mo> <mml:mn>13</mml:mn> </mml:math> </jats:alternatives> </jats:inline-formula> TeV. The search uses the data set collected with the CMS detector in 2016, which corresponds to an integrated luminosity of 35.9 fb<jats:sup>−1</jats:sup>. The analysis considers three exclusive final states and uses reconstruction techniques that are optimized for top quarks with high Lorentz boosts, which requires the use of nonisolated leptons and jet substructure techniques. No significant excess of events relative to the expected yield from standard model processes is observed. Upper limits on the production cross section of heavy resonances decaying to a <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \mathrm{t}\overline{\mathrm{t}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> </jats:alternatives> </jats:inline-formula> pair are calculated. Limits are derived for a leptophobic topcolor Z<jats:sup>′</jats:sup> resonance with widths of 1, 10, and 30%, relative to the mass of the resonance, and exclude masses up to 3.80, 5.25, and 6.65 TeV, respectively. Kaluza-Klein excitations of the gluon in the Randall-Sundrum model are excluded up to 4.55 TeV. To date, these are the most stringent limits on <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \mathrm{t}\overline{\mathrm{t}} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>t</mml:mi> <mml:mover> <mml:mi>t</mml:mi> <mml:mo>¯</mml:mo> </mml:mover> </mml:math> </jats:alternatives> </jats:inline-formula> resonances. </jats:p>

Item Type: Article
Uncontrolled Keywords: Beyond Standard Model, Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 09 May 2019 10:33
Last Modified: 17 Mar 2024 03:35
DOI: 10.1007/JHEP04(2019)031
Open Access URL: http://doi.org/10.1007/JHEP04(2019)031
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3040422