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Measurement of the production cross section of pairs of isolated photons in $pp$ collisions at 13 TeV with the ATLAS detector

The collaboration
CERN-EP-2021-105, 2021.

Abstract (data abstract)
Measurement of inclusive production cross section of pairs of isolated prompt photons with the ATLAS Detector at centre-of-mass energy 13 TeV.The transverse momentum of the photons is required to be greater than 40(30) GeV for the (sub)leading photon. The photons are required to be seperated by more than $\Delta R > 0.4$. The photons are required to be isolated with $E_\mathrm{T}^\mathrm{iso}<0.09\cdot p_{\mathrm{T},\gamma}$. The isolation energy $E_\mathrm{T}^\mathrm{iso}$ is defined as the scalar sum of the transverse momenta of particles in a cone of $\Delta R < 0.2$ around the photon and is corrected for the transverse momentum density of jets in the event.For each differential cross section measurement 100 data bootstrap replicas are provided in the resources which should be used to estimate the statistical uncertainty and the correlations between different observables. For convenience the statitistical uncertainties are also contained in the main tables.The systematic uncertainties can be considered fully correlated and seperate up-and down-variations are provided. Sometimes the up-and down-variations have the same sign. The uncertainties need to be symmetrized before calculating chi2 values.

• #### ph1_pt

Data from Figure 11 for $p_{T,\gamma_{1}}$. Theory predictions from Figure 11 and Figure 18

10.17182/hepdata.104925.v1/t1

Differential cross section as a function of $p_{T,\gamma_{1}}$. The table contains the values measured in data and theory predictions from...

• #### ph2_pt

Data from Figure 11 for $p_{T,\gamma_{2}}$. Theory predictions from Figure 11 and Figure 18

10.17182/hepdata.104925.v1/t2

Differential cross section as a function of $p_{T,\gamma_{2}}$. The table contains the values measured in data and theory predictions from...

• #### yy_xs

Data from Figure 5 and Table 5

10.17182/hepdata.104925.v1/t3

Integrated fiducial cross section measured in data and from different predictions.

• #### yy_m

Data from Figure 11 for $m_{\gamma\gamma}$. Theory predictions from Figure 11 and Figure 18

10.17182/hepdata.104925.v1/t4

Differential cross section as a function of $m_{\gamma\gamma}$. The table contains the values measured in data and theory predictions from...

• #### yy_pT

Data from Figure 12 for $p_{T,\gamma\gamma}$. Theory predictions from Figure 12 and Figure 19

10.17182/hepdata.104925.v1/t5

Differential cross section as a function of $p_{T,\gamma\gamma}$. The table contains the values measured in data and theory predictions from...

• #### yy_pTt

Data from Figure 12 for $a_{T,\gamma\gamma}$. Theory predictions from Figure 12 and Figure 19

10.17182/hepdata.104925.v1/t6

Differential cross section as a function of $a_{T,\gamma\gamma}$. The table contains the values measured in data and theory predictions from...

• #### yy_phiStar

Data from Figure 12 for $\phi_{\eta}*$. Theory predictions from Figure 12 and Figure 19

10.17182/hepdata.104925.v1/t7

Differential cross section as a function of $\phi_{\eta}*$. The table contains the values measured in data and theory predictions from...

• #### yy_piMDphi

Data from Figure 12 for $\pi-\Delta\phi_{\gamma\gamma}$. Theory predictions from Figure 12 and Figure 19

10.17182/hepdata.104925.v1/t8

Differential cross section as a function of $\pi-\Delta\phi_{\gamma\gamma}$. The table contains the values measured in data and theory predictions from...

• #### yy_cosTS

Data from Figure 11 for $|cos\theta*|^{(CS)}$. Theory predictions from Figure 11 and Figure 18

10.17182/hepdata.104925.v1/t9

Differential cross section as a function of $|cos\theta*|^{(CS)}$. The table contains the values measured in data and theory predictions from...