Electroweak phase transition in a right-handed neutrino superfield extended NMSSM

Abstract

Supersymmetric models with singlet extensions can accommodate single- or multi-step first-order phase transitions (FOPT) along the various constituent field directions. Such a framework can also produce Gravitational Waves, detectable at the upcoming space-based interferometers, e.g., U-DECIGO. We explore the dynamics of electroweak phase transition and the production of Gravitational Waves in an extended set-up of the Next-to-Minimal Supersymmetric Standard Model (NMSSM) with a Standard Model singlet right-handed neutrino superfield. We examine the role of the new parameters compared to NMSSM on the phase transition dynamics and observe that the occurrence of a FOPT, an essential requirement for Electroweak Baryogenesis, typically favours a right-handed sneutrino state below 125 GeV. Our investigation shows how the analysis can offer complementary probes for physics beyond the Standard Model besides the collider searches.

Testing Z boson rare decays $$Z\rightarrow H_1 \gamma , A_1 \gamma $$ with $$(g-2)_\mu ,$$ $$ M_W,$$ and $$BR(h_{\textrm{SM}}\rightarrow Z\gamma )$$ in the NMSSM

“…In fact, there exist limits like PQ-symmetry-limit (κ → 0) or Rsymmetry-limit (A κ , A λ → 0), where a light CP-odd Higgs bosons would follow naturally [17]. A light scalar helps to accomplish different goals: (i) to satisfy the dark matter abundance of the Universe through resonance annihilations of light Singlino-like or Bino-like DM pairs, (ii) to initiate a strong first-order electroweak phase transition, which also yields the promising conditions for electroweak baryogenesis [18][19][20][21][22][23], (iii) to boost the BSM contributions to the anomalous magnetic moment of the muon [24][25][26][27] or the W boson mass at one-loop [28][29][30] or even at the two-loop [29]. Thus, the quest of probing light scalars is of interest, especially since this is one of the salient features of the NMSSM.…”