Updated measurements of Higgs boson production in the diphoton decay channel at $\sqrt{s}=13~\textrm{TeV}$ in pp collisions at CMS.

An observation of the Higgs boson production for the two photon decay channel with the 2016 LHC $\textrm{Run}~2$ data is described. The analysis is performed using the dataset recorded by the CMS experiment at the LHC from pp collisions at centre-of-mass energy of $13~\textrm{TeV}$ corresponding to an integrated luminosity of $12.9~\textrm{fb}^{-1}$. The observed significance for the standard model Higgs boson at the Run 1 ATLAS+CMS combined $m_{H} = 125.09~\mathrm{GeV}$ is $5.6~\sigma$, where $6.2~\sigma$ is expected. A maximum significance of $6.1~\sigma$ is observed at $126.0~\mathrm{GeV}$. The best-fit signal strength relative to the standard model prediction is $0.95 \pm 0.20 = 0.95 \pm 0.17 \text{~(stat.)~}^{+0.10}_{-0.07} \text{~(syst.)~}^{+0.08}_{-0.05} \text{~(theo.)}$ when the mass parameter is profiled in the fit, and $0.91 \pm 0.20 = 0.91 \pm 0.17 \text{~(stat.)~} ^{+0.09}_{-0.07} \text{~(syst.)~} ^{+0.08}_{-0.05} \text{~(theo.)}$ when it is fixed to $m_{H} = 125.09~\mathrm{GeV}$. The fiducial cross section is measured to be $\hat{\sigma}_{fid} = 69^{+18}_{-22}~\text{fb} = 69^{+16}_{-22} (\text{stat.})^{+8}_{-6} (\text{syst.})~\text{fb}$, where the standard model theoretical prediction is $73.8 \pm 3.8~\mathrm{fb}$.