Search for a heavy pseudoscalar Higgs boson decaying to a 125 GeV Higgs boson and a Z boson in final states with two tau and two light leptons in proton-proton collisions at s\sqrt{s} = 13 TeV

Collaboration
Jan 21, 2025
51 pages
e-Print:
Report number:
  • CMS-HIG-22-004,
  • CERN-EP-2024-313
Experiments:

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Abstract: (arXiv)
A search for a heavy pseudoscalar Higgs boson, A, decaying to a 125 GeV Higgs boson h and a Z boson is presented. The h boson is identified via its decay to a pair of tau leptons, while the Z boson is identified via its decay to a pair of electrons or muons. The search targets the production of the A boson via the gluon-gluon fusion process, gg \to A, and in association with bottom quarks, bbˉ\mathrm{b\bar{b}}A. The analysis uses a data sample corresponding to an integrated luminosity of 138 fb1^{-1} collected with the CMS detector at the CERN LHC in proton-proton collisions at a centre-of-mass energy of s\sqrt{s} = 13 TeV. Constraints are set on the product of the cross sections of the A production mechanisms and the A \to Zh decay branching fraction. The observed (expected) upper limit at 95% confidence level ranges from 0.049 (0.060) pb to 1.02 (0.79) pb for the gg \to A process and from 0.053 (0.059) pb to 0.79 (0.61) pb for the bbˉ\text{b}\bar{\text{b}}A process in the probed range of the A boson mass, mAm_\text{A}, from 225 GeV to 1 TeV. The results of the search are used to constrain parameters within the Mh,EFT125{\text{M}_{\text{h,EFT}}^{\text{125}}} benchmark scenario of the minimal supersymmetric extension of the standard model. Values of tanβ\tan\beta below 2.2 are excluded in this scenario at 95% confidence level for all mAm_\text{A} values in the range from 225 to 350 GeV.
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