arXiv subjects

W. Sreethawong

Publications and source records attributed to W. Sreethawong.

5 recordsLinked to original sources

arXiv2025

Effect of construction steels on PMTs detection efficiency at JUNO

We study the impact of the carbon steel rebars and the steel TT bridge within the JUNO structure on the shielding effect of the coils. Our simulations demonstrate that despite the presence of carbon steel structures of the rebars of the water pool and the TT bridge within the central detector vicinity, the residual magnetic field experienced by the PMTs remains within the acceptable limit established by the JUNO experiment of 10% for CD-PMTs and 20% for Veto-PMTs, compared to the geomagnetic field. The maximum magnetic fields experienced by the CD-PMTs and Veto-PMTs are 9% and 18% of the geomagnetic field strength, respectively. These findings indicate that the residual magnetic field has minimal impacts on the PMTs detection efficiency.

physics.ins-det↗

arXiv2025

Investigation of $Δ(1232)$ resonance substructure in $pγ^*\to Δ(1232)$ process through helicity amplitudes

This work investigates the substructure of the $Δ(1232)$ resonance in the $pγ^*\to Δ(1232)$ process through helicity transition amplitudes within the quark model framework. We consider the involved baryons composed of three quarks, and both the quark core and meson cloud contribute to the transition amplitudes. The comparison of theoretical results with experimental data reveals that, rather than the $L=0$ component of the $Δ(1232)$ resonance, it is the $L=2$ component that significantly affects its $S_{1/2}$ amplitude. These findings indicate that the $Δ(1232)$ resonance likely contains a substantial $L=2$ component, challenging the conventional view of the $Δ(1232)$ resonance as an $L=0$ baryon.

hep-ph↗

arXiv2018

Neutrino spectrum in SU$(3)_\ell\times$SU$(3)_E$ gauged lepton flavor model

Massive neutrino is an evidence of new physics beyond the Standard Model. One of the well motivated new physics scenarios is a model with gauged lepton flavor symmetry. We investigate neutrino properties in the minimal SU$(3)_\ell\times$SU$(3)_E$ gauged lepton flavor model. In this model, three new species of fermions are introduced to cancel gauge anomalies. These new fermions lead to a see-saw mechanism for neutrino mass generation. We impose the constraints from perturbative unitarity in 2-2 scattering processes, as well as current experimental constraints, to obtain viable neutrino spectrum. We determine the lower bound, with the SU(3)$_\ell$ gauge coupling set to 1, on the lightest neutrino mass of $3.76\times10^{-3}\,(18.9\times10^{-3})\,$ eV for the normal (inverted) hierarchy.

hep-ph↗

arXiv2015

Exclusion of $c\bar c$ Interpretation for $X(3940)$

Partial decay widths of the $X(3940)$ are evaluated in the $^3P_0$ quark model, assuming a charmonium scenario for its structure. In the study all model parameters are predetermined by other reactions. The work reveals that it is difficult to accommodate the $X(3940)$ with any $c\bar c$ meson state in the picture of the potential quark model plus the $^3P_0$ quark dynamics.

hep-ph↗

arXiv2014

Reaction $e^+e^-\to\bar DD$ and $ψ'$ mesons

We study the reaction $e^+e^-\to\bar DD$ near threshold in the $^3P_0$ non-relativistic quark model, including as intermediate states the $J/ψ$, $ψ(2S)$, $ψ(3770)$ and $ψ(4040)$ mesons. The work reveals that experimental data strongly favor one of the two $ψ(2S)-ψ(3770)$ mixing angles derived by fitting to the $e^-e^+$ partial decay widths of the $ψ(2S)$ and $ψ(3770)$ mesons. The meson $X(3940)$ as well as the resonance around 3.9 GeV observed by Belle and BaBar Collaborations in the reaction $e^+e^-\rightarrow \bar DD$ is unlikely to be a $c\bar c$ $I^G(J^{PC})=0^-(1^{--})$ state.

hep-ph↗