CMS-PAS-FTR-21-008

CMS-PAS-FTR-21-008
A projection of the precision of the Higgs boson mass measurement in the diphoton decay channel at the High Luminosity LHC
CMS Collaboration
March 2022

Abstract: A projection of the precision with which the mass of the Higgs boson can be measured at the High-Luminosity LHC with the CMS detector in the diphoton decay channel is presented. In this note we summarize the strategy of this projection with an emphasis on the methods employed to mitigate and to quantify the main sources of systematic uncertainty developed for the same measurement using the CMS Run 2 dataset.
Links: CDS record (PDF) ; CADI line (restricted) ;

Figures	Summary	References	CMS Publications

Figures
png pdf	Figure 1-a: The signal shape models for the highest resolution analysis category (left), and the sum of all categories combined together after scaling each of them by the corresponding S/(S+B) ratio (right) for a simulated H $\rightarrow \gamma \gamma$ signal sample with ${m_\mathrm{H}} =$ 125 GeV. The open squares represent weighted simulation events and the blue line the corresponding model. Also shown is the $\sigma _\text {eff}$ value (half the width of the narrowest interval containing 68.3% of the invariant mass distribution) and the full width at half of the maximum (FWHM).
png pdf	Figure 1-b: The signal shape models for the highest resolution analysis category (left), and the sum of all categories combined together after scaling each of them by the corresponding S/(S+B) ratio (right) for a simulated H $\rightarrow \gamma \gamma$ signal sample with ${m_\mathrm{H}} =$ 125 GeV. The open squares represent weighted simulation events and the blue line the corresponding model. Also shown is the $\sigma _\text {eff}$ value (half the width of the narrowest interval containing 68.3% of the invariant mass distribution) and the full width at half of the maximum (FWHM).
png pdf	Figure 2: The likelihood scan of the expected Higgs boson mass in the diphoton decay channel for an integrated luminosity of 3000 fb $^{-1}$ . The solid lines are for the full likelihood scan including all systematic uncertainties, while the dashed lines denote the same with the statistical uncertainty only.

Summary

A projection of the precision of the Higgs boson mass, in the diphoton decay channel, with the upgraded CMS detector at the HL-LHC under the scenario of 3000 fb

$^{-1}$ integrated luminosity has been performed. The projection methodology adopted is based on the last measurement of

$m_{\mathrm{H}}$ in the diphoton decay channel with the 2016 dataset of Run 2 [4], with several improvements implemented in the photon energy calibration procedure which lead to a more precise reconstruction of the photon energy scale. The precision of

$m_{\mathrm{H}}$ is thus projected to be

$m_{\mathrm{H}} =$ 125.38

$\pm$ 0.02 (stat)

$\pm$ 0.07 (syst) GeV.

References
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