Abstract:

The search for quantum black holes (QBHs) was performed using proton–proton collision data collected by the ATLAS detector at the Large Hadron Collider in 2015−2018 at a center-of-mass energy of √s = 13 TeV corresponding to integrated luminosity of 139 fb⁻¹. The QBH production in quantum gravity is considered in two models with large extra spatial dimensions. The ADD model assumes a 10-dimension QBH (with the number of extra dimensions n = 6) and the RS1 model assumes a 5-dimension QBH (n = 1). The QBHs are assumed to decay into a two-body final state onto a lepton (electron or muon) and a quark with a high transverse momentum (p_T>130 GeV). Events with high invariant mass of the lepton-jet pair are used to search for the QBH signal. An excess of these events above the background was not found, which indicates that effects beyond the Standard Model are not observed. It allows us to set only some limits. The model-independent upper limit at the 95% confidence level (C.L.) is set on the product of the cross section and branching fraction (σ´Br) for production and decay of the QBH. The limits onto the σ´Br and threshold mass of the QBH for the ADD and RS1 models are also set.