Nuclear Theory·nucl-th

Monday·August 18, 2025

6 papers—3 primary·3 cross-listed

04
Studying the in-medium $ϕ$ meson spectrum through kaons in proton-nucleus reactions
Gabor Balassa🇰🇷 · Kazuya Aoki🇯🇵 · Philipp Gubler🇯🇵 · Su Houng Lee🇰🇷 · Hiroyuki Sako🇯🇵 · Gyorgy Wolf🇭🇺
Exploring the mass modifications of $ϕ$ mesons in nuclei provides insights into the nature of strongly interacting matter. Specifically, $ϕ$ meson mass shifts can be related to the in-medium modification of the strange quark condensate. Therefore, the partial restoration of chiral symmetry can be studied by observing the mass shifts through the decay channels $ϕ \to e^{+} e^{-}$ , and $ϕ \to K^{+} K^{-}$ . In this paper, we examine the possibility of observing the $ϕ$ meson mass modifications of the $ϕ$ mesons in 30 GeV proton-nucleus (C, Cu, Pb) collisions, to be studied at the J-PARC E88 experiment, through the kaonic decay channel, with the off-shell Budapest Boltzmann-Uehling-Uhlenbeck (BuBUU) transport model. By applying different mean fields to the kaons, we examine their effects on the invariant mass spectra. Our simulations suggest that, although different mean fields for the kaons do affect the spectrum, there is a common observable effect primarily driven by the $ϕ$ mass shift. However, due to the threshold associated with the two kaons, the signal we observe is quite different from the one expected in dilepton spectra. Therefore, to meaningfully constrain the mass shift, it will be useful to include both kaon and dilepton channels in the analysis of the experimental data.
↳ hep-phnucl-thPTEP(2025)·3 citations
05
Exotic Heavy Hadrons
H- Garcilazo🇲🇽 · A. Valcarce🇪🇸
We review our recent findings on the structure and properties of exotic heavy hadrons, focusing on two main topics. First, we examine the role of correlations driven by the short-range Coulomb-like color interaction in hidden heavy-flavor pentaquarks. We show how this framework consistently accounts for the observed pattern of $P_{c}$ and $P_{cs}$ states in the hidden-charm sector and enables predictions for the hidden-bottom sector, where experimental data are still lacking. The second topic explores the possibility of forming stable multihadron molecules from deeply bound two-hadron exotic states. In this context, a bound state of three $B$ mesons, denoted as $T_{bbb}$ , with quantum numbers $(I) J^{P} = (1/2) 2^{-}$ , is presented. We find that the binding energy generally decreases as the number of hadrons increases, primarily due to effects of the Pauli principle and the appearance of new decay thresholds. Nonetheless, resonances may still arise in specific cases, depending on the internal thresholds of the system. Finally, we discuss how the decay width of an exotic multihadron resonance can offer valuable insights into its internal structure and underlying~dynamics.
↳ hep-phnucl-thSymmetry(2025)·4 citations
06
Quantum Simulation of Collective Neutrino Oscillations in Dense Neutrino Environment
Shvetaank Tripathi🇮🇳 · Sandeep Joshi🇮🇳 · Garima Rajpoot🇮🇳 · Prashant Shukla🇮🇳
Inside dense neutrino gases, such as neutron star mergers or core-collapse supernovae, collective neutrino effects cause the transformation of one neutrino flavour into another. Due to strong neutrino self-interactions in these environments, there is prevalence of flavour swapping. Considering these environments to be isotropic and homogeneous, we present a study of collective neutrino oscillations by simulating such a system on a noisy quantum simulator (Qiskit AerSimulator) and a quantum processor (ibm\_brisbane). We model the effective Hamiltonian governing neutrino interactions and by applying the Trotter-Suzuki approximation, decompose it into a tractable form suitable for quantum circuit implementation of the time-evolution propagator. Encoding the neutrino state for a system of two- and three-neutrinos onto qubits, we compute the time evolution of the inversion probability relative to the initial product state. Furthermore, we present quantum circuits to evaluate the concurrence as a measure of entanglement between the neutrinos.
↳ quant-phhep-phnucl-thQuant.Inf.Proc.(2026)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE

Studying the in-medium ϕ meson spectrum through kaons in proton-nucleus reactions

Exotic Heavy Hadrons

Quantum Simulation of Collective Neutrino Oscillations in Dense Neutrino Environment

Affiliations

Studying the in-medium $ϕ$ meson spectrum through kaons in proton-nucleus reactions