T-2, Nuclear and Particle Physics, Astrophysics and Cosmology

Discerning the Low mu NMSSM Higgs from the MSSM

Yu Gao

In the seminar I will discuss the possible ways to distinguish the Next-to Minimal Supersymmetric Standard Model (NMSSM) from the Minimal Supersymmetric Standard Model (MSSM) in case the Higgs particle is the only scalar observed. In the NMSSM, a sizeable coupling $lambda$ between the singlet and Higgs fields can naturally explain the 125 GeV mass of the observed Higgs boson. This large coupling also necessitates a large separation of the Higgsino and singlino mass scales in the neutralino sector which is helpful to evade stringent direct detection constraints. Most of the natural parameter space in this setup therefore contains light Higgsinos that can decay into the 125 GeV Higgs. In addition, the LHC Higgsino reach from the direct production restricts us to a low mass gap m_{˜χ^0_2} -(m_{˜χ^0_1} +m_h)$ scenario. We study the collider phenomenology of this process and demonstrate that the 4$b+j+met$ signal arising from $pp-->˜χ_i^0 ˜χ_j^0jj$ process can be a viable channel to search for the low mass gap at the 14 TeV LHC when the new (pseudo) scalar is not much lighter than the Higgs Boson. We also find that this search, in tandem with direct detection experiments, can distinguish the NMSSM from the MSSM for positive values of the $mu$ parameter even when additional scalars are absent at the LHC or indistinguishable in mass from the Higgs during the neutralino decay processes.


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