Conveners
Parallel 1
- Nicolás Bernal (New York University Abu Dhabi)
Statistically significant excesses exist at around 152 GeV in associated di-photon production contained in the sidebands of SM Higgs analyses. They are pronounced in several signal regions and can be explained by the Drell-Yan production of a new Higgs boson in association with a charged Higgs boson. In this context, we first examine the excesses in a simplified model approach, considering the...
Recently, statistically significant excesses in inclusive and associated di-photon searches have been observed at the LHC, accumulating at around 95 GeV and 152 GeV, respectively. In this context, I will argue how the most general CP-violating 2HDM in the Yukawa alignment limit can account for these observations. In the Higgs basis, where the two scalar doublets are identified as $H_1$ and...
The excesses observed by CMS in the $\tau\tau$ and $\gamma\gamma$ channels around 95 GeV, together with the $b\bar{b}$ excess reported by the LEP collaboration in the same mass region, have sparked significant interest in the possibility of new physics beyond the Standard Model (BSM). Several BSM frameworks featuring a non-standard Higgs-like state lighter than 125~GeV have been proposed to...
Within a new physics scenario, four-fermion operators of the Nambu–Jona-Lasinio (NJL) type exhibit a strong-coupling ultraviolet (UV) fixed point at the TeV scale [[1]][1]. At this scale, a quark and a lepton—two Standard Model (SM) elementary fermions—form a bound state, resulting in a composite bosons, which couples to its constituents via effective contact interactions at the...
We investigate the co-scattering mechanism for dark matter production in an EFT framework which contains new $Z_2$-odd singlets, namely two fermions $N_{1,2}$ and a real scalar $\chi$. The singlet scalar $\chi$ is the dark matter candidate. The dimension-5 operators play a vital role to set the observed DM relic density.We focus on a nearly degenerate mass spectrum for the $Z_2$ odd...
The physics program of the future electron-positron Higgs factory will focus on the measurement of the 125 GeV Higgs boson, with the Higgs-strahlung process being the dominant production channel at 240-250 GeV. However, similar production of light exotic scalars, in a scalar-strahlug process, is still not excluded by the existing experimental data, provided their coupling to the SM gauge...
Majoron ($J$) is a feebly-interacting axion-like particle that can realize type-I seesaw mechanism, which also leads to flavor violating processes (FVP). We revisit prospects of sub-GeV majoron at intensity frontier experiments. We show that FVP allow to probe the majoron mass region $\sim 100$ MeV to $1$ GeV, complementary to astrophysical bounds and dedicated experiments probing FVP. We also...
Multi-axion scenarios have interesting applications in cosmology, especially in the context of inflation. An interesting manifestation of such scenarios arises within the framework of the clockwork mechanism wherein the light axion is localized towards one end of a theory space lattice composed of $N$ scalar fields through a specific form of near-neighbour interactions. This effectively...
