Higgs self-coupling in the MSSM and NMSSM after the LHC Run 1

Lei Wu, Jin Min Yang, C.-P. Yuan, Mengchao Zhang
2015 Physics Letters B  
λ SM 3h 1 < 2 can occur, which is accompanied by a sizable change of h 1 τ + τ − coupling. The future colliders, such as the HL-LHC and ILC, will have the capacity to test these large deviations in the NMSSM. (C.-P. Yuan), mczhang@itp.ac.cn (M. Zhang). Here 2 246 GeV is the vacuum expectation value of the Higgs field and m h 125 GeV is the Higgs boson mass. Within the SM, the trilinear Higgs coupling receives the dominant correction from the top quark loop, δλ SM hhh which reduces its
more » ... duces its tree-level value by about 10%. Hence, the determination of the Higgs trilinear coupling λ hhh and quartic coupling λ hhhh can directly test the relation in Eq. (2) which is obtained from the minimization of the Higgs potential. At the LHC, the only way to measure the Higgs trilinear coupling is through the Higgs pair production, which is dominated by the gluon fusion mechanism and has a small cross section [6] . However, in many new physics models, such as the minimal supersymmetric model (MSSM) and the next-to-minimal supersymmetric model (NMSSM), the Higgs pair production rate can be significantly altered by new particles and Higgs couplings [7] . Among various decay channels of the Higgs pair, the 4b final state has the largest fraction [8], but the rare process hh → bbγ γ is expected to have the most promising sensitivity due to the low backgrounds at the LHC [9]. The recent applications of jet substructure and other techniques to Higgs pair production have been found to improve the sensitivity to the trilinear Higgs couplings in τ + τ − and W + W − final states [10] . On the other hand, the measurement of the Higgs quartic coupling is more challenging due to a much smaller cross section of triple Higgs production at the LHC.
doi:10.1016/j.physletb.2015.06.020 fatcat:dlfjkw4fajapvlw5tutn5cuybq