Search for high-mass dilepton resonances in pp collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

Tanasijczuk, Andres Jorge;ATLAS;et.al.
(2014) Physical review D — Vol. 90 (2014)

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<p>The ATLAS detector at the Large Hadron Collider is used to search for high-mass resonances decaying to dielectron or dimuon final states. Results are presented from an analysis of proton-proton (<inline-formula><mml:math display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math></inline-formula>) collisions at a center-of-mass energy of 8 TeV corresponding to an integrated luminosity of <inline-formula><mml:math display="inline"><mml:mrow><mml:mn>20.3</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:msup><mml:mrow><mml:mi>fb</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo><mml:mn>1</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math></inline-formula> in the dimuon channel. A narrow resonance with Standard Model <inline-formula><mml:math display="inline"><mml:mi>Z</mml:mi></mml:math></inline-formula> couplings to fermions is excluded at 95% confidence level for masses less than 2.79 TeV in the dielectron channel, 2.53 TeV in the dimuon channel, and 2.90 TeV in the two channels combined. Limits on other model interpretations are also presented, including a grand-unification model based on the <inline-formula><mml:math display="inline"><mml:msub><mml:mi>E</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math></inline-formula> gauge group, <inline-formula><mml:math display="inline"><mml:msup><mml:mi>Z</mml:mi><mml:mo>*</mml:mo></mml:msup></mml:math></inline-formula> bosons, minimal <inline-formula><mml:math display="inline"><mml:mrow><mml:mi>Z</mml:mi><mml:mo>′</mml:mo></mml:mrow></mml:math></inline-formula> models, a spin-2 graviton excitation from Randall-Sundrum models, quantum black holes, and a minimal walking technicolor model with a composite Higgs boson.</p>
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Tanasijczuk, A. J., ATLAS, & et al. (2014). Search for high-mass dilepton resonances in pp collisions at $\sqrt{s}=8$ TeV with the ATLAS detector. Physical review D, 90. https://doi.org/10.1103/PhysRevD.90.052005 (Original work published 2014)