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Measurement of the self coupling of 125 GeV Higgs boson is one of the mostcrucial tasks for high luminosity run of the LHC and it can only be measured inthe di-Higgs final state. In the minimal supersymmetric standard model, heavyCP even Higgs ($H$) can decay into lighter 125 GeV Higgs boson ($h$) andtherefore influence the di-Higgs production. We investigate the role of single$H$ production in the measurement of self coupling of $h$. We find that $H\rightarrow hh$ decay can nontrivially affect the $h$ self coupling measurementin low tan$\beta$ regime when the mass of the heavy Higgs boson lies between250 - 600 GeV and depending on the parameter space it may be seen as anenhancement of the self coupling of 125 GeV Higgs boson.

The role of MSSM heavy Higgs production in the self coupling measurement of the 125 GeV Higgs boson at the LHC