"QBH upper cross section limit of the emu channel" of "Search for heavy resonances and quantum black holes in e$\mu$, e$\tau$, and $\mu\tau$ final states in proton-proton collisions at $\sqrt{s}$ = 13 TeV"

Expected (black dashed line) and observed (black solid line) 95% CL upper limits on the product of cross section and branching fraction for quantum black hole production in an ADD model with $n=4$ extra dimensions, in the e$\mu$ channel. The shaded bands represent the one and two standard deviation (s.d.) uncertainties in the expected limits. The red solid lines show the product of cross section times branching fraction as a function of the QBH threshold mass.

预期（黑色虚线）和观测（黑色实线）的95%置信水平（confidence level，CL）上限，对应具有n=4个额外维度的ADD模型中量子黑洞（quantum black hole，QBH）产生过程在eμ通道下的截面与分支比乘积。阴影带表示预期上限的1倍和2倍标准偏差（standard deviation，s.d.）不确定性。红色实线显示截面乘以分支比的乘积随QBH阈值质量的变化关系。