particle-level jet momenta over the whole jet spectrum and detector acceptance, and corrected on average accordingly. In situ measurements of the momentum balance in dijet, $\text{photon} + \text{jet}$, $\cPZ + \text{jet}$, and multijet events are used to account for any residual differences in jet energy scale in data and simulation [@Khachatryan:2016kdb]. The jet energy resolution amounts typically to 15% at 10, 8% at 100, and 4% at 1.

Jets originating from the hadronization of quarks are identified using the combined secondary vertex (CSV) -tagging algorithm [@Sirunyan:2017ezt]. The algorithm converts information on the displaced secondary vertex into a numerical discriminant, assigning high values to jets whose properties are more likely to be originating from quarks. A tight working point on this discriminant is used in this analysis, which provides a misidentification rate for jets from light quarks and gluons of $0.1$% and an efficiency for identifying quark jets of about $55$%.

The missing transverse momentum , whose magnitude is referred to as , is defined as the negative vectorial sum of the transverse momenta of all reconstructed particle flow candidates in the global event reconstruction.

Because no tracks are associated to photons, the assignment of the diphoton candidate to a vertex 