CMS-HIG-20-015

CMS-HIG-20-015 ; CERN-EP-2021-134
Measurement of the inclusive and differential Higgs boson production cross sections in the decay mode to a pair of $\tau$ leptons in pp collisions at $\sqrt{s} = $ 13 TeV
CMS Collaboration
23 July 2021
Phys. Rev. Lett. 128 (2022) 081805
Abstract: Measurements of the inclusive and differential fiducial cross sections of the Higgs boson are presented, using the $\tau$ lepton decay channel. The differential cross sections are measured as functions of the Higgs boson transverse momentum, jet multiplicity, and transverse momentum of the leading jet in the event if any. The analysis is performed using proton-proton data collected with the CMS detector at the LHC at a center-of-mass energy of 13 TeV and corresponding to an integrated luminosity of 138 fb$^{-1}$. These are the first differential measurements of the Higgs boson cross section in the final state of two $\tau$ leptons, and they constitute a significant improvement over measurements in other final states in events with a large jet multiplicity or with a Lorentz-boosted Higgs boson.
Links: e-print arXiv:2107.11486 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; Physics Briefing ; CADI line (restricted) ;

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	Figure 1: Observed and expected differential fiducial cross section in bins of $ {{p_{\mathrm {T}}} ^{\mathrm{H}}} $ (upper left), $ {N_\text {jets}} $ (upper right), and $ {{p_{\mathrm {T}}} ^{\mathrm {j}_1}} $ (lower). The most-left bin in the $ {{p_{\mathrm {T}}} ^{\mathrm {j}_1}} $ distribution includes all events without a jet with $ {p_{\mathrm {T}}} > $ 30 GeV. The uncertainty bands in the theoretical predictions include uncertainties from the following sources: PDF, renormalization and factorization scale, underlying event and parton showering, and branching fraction of the Higgs boson to $\tau$ leptons. The last bins include the overflow.
png pdf	Figure 1-a: Observed and expected differential fiducial cross section in bins of $ {{p_{\mathrm {T}}} ^{\mathrm{H}}} $. The uncertainty bands in the theoretical predictions include uncertainties from the following sources: PDF, renormalization and factorization scale, underlying event and parton showering, and branching fraction of the Higgs boson to $\tau$ leptons. The last bin includes the overflow.
png pdf	Figure 1-b: Observed and expected differential fiducial cross section in bins of $ {N_\text {jets}} $. The uncertainty bands in the theoretical predictions include uncertainties from the following sources: PDF, renormalization and factorization scale, underlying event and parton showering, and branching fraction of the Higgs boson to $\tau$ leptons. The last bin includes the overflow.
png pdf	Figure 1-c: Observed and expected differential fiducial cross section in bins of $ {{p_{\mathrm {T}}} ^{\mathrm {j}_1}} $. The most-left bin includes all events without a jet with $ {p_{\mathrm {T}}} > $ 30 GeV. The uncertainty bands in the theoretical predictions include uncertainties from the following sources: PDF, renormalization and factorization scale, underlying event and parton showering, and branching fraction of the Higgs boson to $\tau$ leptons. The last bin includes the overflow.

Tables
png pdf	Table 1: Event selection criteria. The ${p_{\mathrm {T}}}$ ranges are related to different triggers used during different data-taking periods. In events collected in 2016 in the $\mu {\tau _\mathrm {h}} $ channel, $ {\tau _\mathrm {h}} $ candidates with 0.2 $ < {\| \eta \|} < $ 0.3 are discarded because of a significantly larger misidentification rate of muons as $ {\tau _\mathrm {h}} $ objects.

Summary

In summary, measurements of the differential fiducial cross sections of the Higgs boson have been performed for the first time at the LHC in the decay channel of two $\tau$ leptons. The differential cross sections as functions of the Higgs boson transverse momentum, the jet multiplicity, and transverse momentum of the leading jet, are in agreement with the expectations of the standard model, with a competitive precision with respect to measurements in other final states in the phase spaces with a large jet multiplicity, or with a Higgs boson transverse momentum above 120 GeV. In addition, the fiducial inclusive cross section has been measured to be 426 $\pm$ 102 fb, in agreement with the standard-model expectation of 408 $\pm$ 27 fb.

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