A search for quantum black holes in <math><mrow><mi>electron</mi><mo>+</mo><mtext>jet</mtext></mrow></math> and <math><mrow><mi>muon</mi><mo>+</mo><mtext>jet</mtext></mrow></math> invariant mass spectra is performed with <math><mn>140</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>−</mo><mn>1</mn></mrow></msup></math> of data collected by the ATLAS detector in proton-proton collisions at <math><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math> at the Large Hadron Collider. The observed invariant mass spectrum of <math><mrow><mi>lepton</mi><mo>+</mo><mtext>jet</mtext></mrow></math> pairs is consistent with Standard Model expectations. Upper limits are set at 95% confidence level on the production cross section times branching fractions for quantum black holes decaying into a lepton and a quark in a search region with invariant mass above 2.0 TeV. The resulting quantum black hole lower mass threshold limit is 9.2 TeV in the Arkani-Hamed-Dimopoulos-Dvali model, and 6.8 TeV in the Randall-Sundrum model.

France

United States

CERN

Germany

United Kingdom

Canada

Denmark

Israel

Italy

Poland

Türkiye

Switzerland

Netherlands

Romania

Portugal

Spain

Japan

Sweden

Greece

Czechia

Taiwan

Argentina

Brazil

Search for quantum black hole production in <math><mrow><mi>lepton</mi><mo>+</mo><mtext>jet</mtext></mrow></math> final states using proton-proton collisions at <math><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math> with the ATLAS detector