Nuclear Theory·nucl-th

Wednesday·September 10, 2025

10 papers—5 primary·5 cross-listed

06
Energy loss baseline for light hadrons in oxygen-oxygen collisions at $s_{NN} = 5.36 TeV$
Aleksas Mazeliauskas🇩🇪
I present predictions for inclusive charged hadron spectra in minimum-bias proton-proton and oxygen-oxygen collisions at a centre-of-mass energy of $s_{NN} = 5.36 TeV$ , assuming no final-state interactions. Using next-to-leading order perturbative QCD matrix elements, along with state-of-the-art (nuclear) parton distribution and fragmentation functions, I establish a baseline for the nuclear modification factor $R_{AA}^{h}$ in oxygen-oxygen collisions in the absence of quenching. Theoretical uncertainties in this baseline are found to be substantial for transverse momenta below $20 GeV$ . In the intermediate range $20 GeV ≲ p_{T}^{h} ≲ 70 GeV$ , these uncertainties are significantly reduced to approximately 5\%. At higher momenta ( $p_{T}^{h} ≳ 70 GeV$ ), however, predictions exhibit a marked spread due to differences between fragmentation functions, reflecting varying assumptions about isospin symmetry. Finally, I show that considering neon-neon collisions in the initial state or neutral pions in the final state does not appreciably change the nuclear modification factor.
↳ hep-phnucl-exnucl-thPLB(2026)·10 citations
07
Recursive algorithm for constructing antisymmetric fermionic states in first quantization mapping
E. Rule🇺🇸 · I. A. Chernyshev🇺🇸 · I. Stetcu🇺🇸 · J. Carlson🇺🇸 · R. Weiss🇺🇸
We devise a deterministic quantum algorithm to produce antisymmetric states of single-particle orbitals in the first quantization mapping. Unlike sorting-based antisymmetrization algorithms, which require ordered input states and high Clifford-gate overhead, our approach initializes the state of each particle independently. For a system of $η$ particles and $N$ single-particle states, our algorithm prepares antisymmetrized states of non-trivial localized (e.g., Hartree-Fock) orbitals using $O (η^{2} N)$ $T$ -gates, outperforming alternative algorithms when $η ≲ N$ . To achieve such scaling, we require $O (N)$ dirty ancilla qubits for intermediate calculations. Knowledge of the single-particle states to be antisymmetrized can be leveraged to further improve the efficiency of the circuit, and a measurement-based variant reduces gate cost by roughly a factor of two. We show example circuits for two- and three-particle systems and discuss the generalization to an arbitrary number of particles. For a specific three-particle example, we decompose the circuit into Clifford $+ T$ gates and study the impact of noise on the prepared state.
↳ quant-phnucl-thphysics.chem-phQuantum(2026)·1 citation
08
Predictions for $R_{AA}$ in 5.36 TeV C+C, O+O, and Ne+Ne collisions at the LHC
B.G. Zakharov🇷🇺
Experiments on collisions of light nuclei at $s = 5.36$ TeV have recently begun at the LHC. In this regard we make predictions for nuclear modification factor $R_{AA}$ in 5.36 TeV C+C, O+O, and Ne+Ne collisions for scenarios with and without quark-gluon plasma formation in $pp$ collisions. We find a sizeable difference in $R_{AA}$ for these two scenarios, which grows with decreasing atomic number. This says that data on $R_{AA}$ for light nuclei could potentially give information on the presence of jet quenching in $pp$ collisions.
↳ hep-phnucl-thPisma Zh.Eksp.Teor.Fiz.(2025)·2 citations
09
Illuminating dark matter admixed in neutron stars with simultaneous mass-radius constraints
Nai-Bo Zhang🇨🇳 · Bao-An Li🇺🇸 · Jia-Yu Zhang🇨🇳 · Wei-Na Shen🇨🇳 · Hui Zhang🇨🇳
We investigate how simultaneous mass and radius measurements of massive neutron stars (NSs) can help constrain properties of dark matter (DM) possibly admixed in them. Within a fermionic DM model that interacts only through gravitation, along with a well-constrained nuclear matter equation of state, we show that the simultaneous mass and radius measurement of PSRJ0740+6620 reduces the uncertainty of DM central energy density by more than 50\% compared to the results obtained from using the two observables independently, while other DM parameters remain unconstrained. Additionally, we find that the DM fraction $f_{D}$ should be smaller than 2\% when constrained by the observed NS maximum mass alone, and it could be even smaller than 0.3\% with the simultaneous measurement of mass and radius, supporting the conclusion that only a small amount of DM exists in DM admixed neutron stars (DANS).
↳ astro-ph.HEnucl-thSymmetry(2025)·11 citations
10
Excitation Spectra of the $^{12} C (p, d)$ Reaction near the $η^{'}$ -Meson Emission Threshold Measured in Coincidence with High-Momentum Protons
R. Sekiya🇯🇵 · K. Itahashi🇯🇵 · Y. K. Tanaka🇯🇵 · S. Hirenzaki🇯🇵 · N. Ikeno🇯🇵 · V. Metag🇩🇪 · M. Nanova🇩🇪 · J. Yamagata-Sekihara🇯🇵 · V. Drozd🇳🇱 · H. Ekawa🇯🇵 · H. Geissel🇩🇪 · E. Haettner🇩🇪 and 65 other authors
The missing mass of the $^{12} C (p, d)$ reaction has been measured near the $η^{'}$ -meson emission threshold in coincidence with a high-momentum proton to selectively collect $η^{'}$ - $^{11} C$ mesic nucleus formation events at GSI, Germany. A 2.5 GeV proton excites a carbon nucleus to form an $η^{'}$ -mesic nucleus emitting a deuteron forward with an energy of $\sim 1.6$ GeV. The deuteron is momentum-analyzed by the Fragment Separator used as a high-resolution spectrometer to deduce the excitation energy of the residual system. The large-acceptance detector WASA surrounding the target identifies high-momentum protons emitted in the decay of the $η^{'}$ -mesic nucleus. The measured semi-exclusive spectrum exhibits structures below the threshold though the statistical significance is limited. The spectrum is fitted by theoretically calculated spectra varying optical-potential parameters of the $η^{'}$ -nucleus interaction. The analysis results indicate $η^{'}$ -mesic nuclei formation for the real potential depth of $\sim - 61$ MeV with a local statistical significance of $3.5 σ$ and, taking into account the look-elsewhere effect, a global significance of $2.1 σ$ .
↳ nucl-exnucl-thPRL(2026)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE

Energy loss baseline for light hadrons in oxygen-oxygen collisions at sNN​​=5.36TeV

Recursive algorithm for constructing antisymmetric fermionic states in first quantization mapping

Predictions for RAA​ in 5.36 TeV C+C, O+O, and Ne+Ne collisions at the LHC

Illuminating dark matter admixed in neutron stars with simultaneous mass-radius constraints

Excitation Spectra of the 12C(p,d) Reaction near the η′-Meson Emission Threshold Measured in Coincidence with High-Momentum Protons

Affiliations

Energy loss baseline for light hadrons in oxygen-oxygen collisions at $s_{NN} = 5.36 TeV$

Predictions for $R_{AA}$ in 5.36 TeV C+C, O+O, and Ne+Ne collisions at the LHC

Excitation Spectra of the $^{12} C (p, d)$ Reaction near the $η^{'}$ -Meson Emission Threshold Measured in Coincidence with High-Momentum Protons