Add EXOT stat model

docs/bib/HEPData_likelihoods.bib

@@ -43,6 +43,15 @@ @misc{ins1853014
     collaboration = "ATLAS",
 }
 
+@misc{ins1843001,
+    title = "{Search for pair production of third-generation scalar leptoquarks decaying into a top quark and a $\tau$-lepton in $pp$ collisions at $ \sqrt{s} $ = 13 TeV with the ATLAS detector}",
+    doi = "10.17182/hepdata.100174",
+    url = "https://doi.org/10.17182/hepdata.100174",
+    year = "2021",
+    type = "Data Collection",
+    collaboration = "ATLAS",
+}
+
 @misc{ins1839446,
     title = "{Search for squarks and gluinos in final states with one isolated lepton, jets, and missing transverse momentum at $\sqrt{s}=13$  with the ATLAS detector}",
     doi = "10.17182/hepdata.97041",