Constraints on H^± Parameter Space in 2HDM at $\sqrt {s}=$ 8 TeV and $\sqrt {s}=$ 13 TeV

Abstract

This paper reflects the heavy Higgs scenario where the mass of charged Higgs is equal to or greater than 200 GeV. The CMS observed and expected values of upper limits on the product $\sigma _{H^{\pm }} \times BR(H^{\pm } \rightarrow tb^{{\pm }})$, assuming $H^{\pm } \rightarrow tb^{{\pm }}=1$, both at 8 TeV (at integrated luminosity of 19.7 fb^− 1) and 13 TeV (at integrated luminosity of 35.9 fb^− 1 ) center of mass energies are used. By comparing these expected and observed upper limits with computational values, it is found out the expected and observed exclusion regions of charged Higgs parameter space ($m_{H}^{\pm }$ - tanβ space) in 2HDM both at $\sqrt {s}=$ 8 TeV and $\sqrt {s}=$ 13 TeV. We compare the expected and observed exclusion regions and observe that exclusion regions made by observed upper limits are always greater than the exclusion made by expected upper limits both at 8 TeV and 13 TeV energies. Only in the mass range from 200 GeV to 220 GeV the expected exclusion region is greater than the observed one only at $\sqrt {s}=$ 13 TeV. We also equate the exclusion regions at these two different center of mass energies and find that the expected exclusion region and observed exclusion region at $\sqrt {s}=$13 TeV are always greater than the expected exclusion region and observed exclusion region at $\sqrt {{s}}=$ 8 TeV respectively.