Search for Quantum Black Hole Production in High-Invariant-Mass Lepton$+$Jet Final States Using $pp$ Collisions at $\sqrt{s} =$ 8 TeV and the ATLAS Detector

Tanasijczuk, Andres Jorge;ATLAS;et.al.
(2014) Physical Review Letters — Vol. 112 (2014)

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<p>This Letter presents a search for quantum black-hole production using <inline-formula><mml:math display="inline"><mml:mrow><mml:mn>20</mml:mn><mml:mo>.</mml:mo><mml:mn>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> of data collected with the ATLAS detector in <inline-formula><mml:math display="inline"><mml:mi>p</mml:mi><mml:mi>p</mml:mi></mml:math></inline-formula> collisions at the LHC at <inline-formula><mml:math display="inline"><mml:mrow><mml:msqrt><mml:mrow><mml:mi>s</mml:mi></mml:mrow></mml:msqrt><mml:mo>=</mml:mo><mml:mn>8</mml:mn><mml:mtext> </mml:mtext><mml:mtext> </mml:mtext><mml:mi>TeV</mml:mi></mml:mrow></mml:math></inline-formula>. The quantum black holes are assumed to decay into a final state characterized by a lepton (electron or muon) and a jet. In either channel, no event with a lepton-jet invariant mass of 3.5 TeV or more is observed, consistent with the expected background. Limits are set on the product of cross sections and branching fractions for the <inline-formula><mml:math display="inline"><mml:mrow><mml:mtext>lepton</mml:mtext><mml:mo>+</mml:mo><mml:mtext>jet</mml:mtext></mml:mrow></mml:math></inline-formula> final states of quantum black holes produced in a search region for invariant masses above 1 TeV. The combined 95% confidence level upper limit on this product for quantum black holes with threshold mass above 3.5 TeV is 0.18 fb. This limit constrains the threshold quantum black-hole mass to be above 5.3 TeV in the model considered.</p>
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Tanasijczuk, A. J., ATLAS, & et al. (2014). Search for Quantum Black Hole Production in High-Invariant-Mass Lepton$+$Jet Final States Using $pp$ Collisions at $\sqrt{s} =$ 8 TeV and the ATLAS Detector. Physical Review Letters, 112. https://doi.org/10.1103/PhysRevLett.112.091804 (Original work published 2014)