Nuclear Theory·nucl-th

Thursday·January 8, 2026

8 papers—4 primary·4 cross-listed

05
[Submitted on 7 Jan 2026] (cross-list from hep-ph)
Role of $Σ (1660)$ in the $K^{-} p \to π^{0} π^{0} Σ^{0}$ reaction
Xing-Yi Ji🇨🇳 · Si-Wei Liu🇨🇳 · Wen-Tao Lyu🇨🇳 · De-Min Li🇨🇳 · En Wang🇨🇳 · Ju-Jun Xie🇨🇳
The processes of $K^{-} p \to π^{0} π^{0} Σ^{0}$ and $K^{-} p \to π^{0} Λ (1405)$ are studied within the effective Lagrangian approach. In addition to the ``background" contribution from the $u$ -channel nucleon pole term, contribution from the $Σ (1660)$ resonance with spin-parity $J^{P} = 1/ 2^{+}$ is also considered. For the $K^{-} p \to π^{0} π^{0} Σ^{0}$ reaction, we perform a calculation for the total and differential cross sections by considering the contribution from the $Σ (1660)$ intermediate resonance decaying into $π^{0} Λ (1405)$ with $Λ (1405)$ decaying into $π^{0} Σ^{0}$ . With our model parameters, the available experimental data on both the $K^{-} p \to π^{0} π^{0} Σ^{0}$ and $K^{-} p \to π^{0} Λ (1405)$ reactions can be fairly well reproduced. It is shown that we really need the contribution from the $Σ (1660)$ resonance, and that these experimental measurements could be used to determine some properties of the $Σ (1660)$ resonance.
Comments:
7 pages, 6 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2601.03692 [pdf]
CPC(2026)·0 citations
06
[Submitted on 7 Jan 2026] (cross-list from quant-ph)
Scattering phase shift in quantum mechanics on quantum computers
Peng Guo🇺🇸 · Paul LeVan🇺🇸 · Frank X. Lee🇺🇸 · Yong Zhao🇺🇸
We investigate the feasibility of extracting infinite volume scattering phase shift on quantum computers in a simple one-dimensional quantum mechanical model, using the formalism established in Ref.~\cite{Guo:2023ecc} that relates the integrated correlation functions (ICF) for a trapped system to the infinite volume scattering phase shifts through a weighted integral. The system is first discretized in a finite box with periodic boundary conditions, and the formalism in real time is verified by employing a contact interaction potential with exact solutions. Quantum circuits are then designed and constructed to implement the formalism on current quantum computing architectures. To overcome the fast oscillatory behavior of the integrated correlation functions in real-time simulation, different methods of post-data analysis are proposed and discussed. Test results on IBM hardware show that good agreement can be achieved with two qubits, but complete failure ensues with three qubits due to two-qubit gate operation errors and thermal relaxation errors.
Comments:
Title changed to Scattering phase shift in quantum mechanics on quantum computers, and updated version match to accepted draft at PRD
Subjects:
Quantum Physics (quant-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2601.04092 [pdf]
PRD(2026)·5 citations
07
[Submitted on 7 Jan 2026] (cross-list from hep-ph)
Complete NLO BFKL impact factors for quarkonium hadroproduction in NRQCD: the case of $^{1} S_{0}^{[1]}$ , $^{1} S_{0}^{[8]}$ , and $^{3} S_{1}^{[8]}$ states
Michael Fucilla🇵🇱 · Jean-Philippe Lansberg🇫🇷 · Maxim Nefedov🇮🇱 · Lech Szymanowski🇵🇱 · Samuel Wallon🇫🇷
We present the first complete next-to-leading-order calculation of the impact factors for hadroproduction of the $^{1} S_{0}^{[1]}$ , $^{1} S_{0}^{[8]}$ , and $^{3} S_{1}^{[8]}$ NRQCD states within the BFKL formalism. We complete the recent virtual-correction computation presented in JHEP 12 (2024) 129 by that of the real-emission contributions. We observe the cancellation of the soft divergences between these real- and virtual-emission contributions and we note that the surviving collinear singularities are compatible with factorisation up to one loop for a novel class of processes where BFKL resummation can be applied. Our work indeed represents the first complete NLO quarkonium impact factor in the BFKL framework and paves the way to first next-to-leading-logarithmic-precision studies for hadroproduction of forward-backward quarkonium associated production at hadron colliders.
Comments:
52 pages, 6 figures; version submitted to JHEP; broken references fixed
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2601.04142 [pdf]
JHEP(2026)·0 citations
08
[Submitted on 7 Jan 2026] (cross-list from hep-lat)
Three-particle scattering amplitudes from lattice QCD
Stephen R. Sharpe🇺🇸
I review recent progress in calculating scattering amplitudes and resonance properties involving three particles using results from lattice QCD. The necessary input is the finite-volume spectrum, and the outputs -- via solutions of integral equations -- are scattering amplitudes that can be continued into the complex plane to search for resonance poles. I describe the outlook for future extensions and applications of this work.
Comments:
Plenary talk at Lattice 2025. 26 pages, 7 figures. v2: minor improvements in text, typos corrected
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2601.04147 [pdf]
9 citations

Affiliations

first authorsco-authorsvia INSPIRE

Role of Σ(1660) in the K−p→π0π0Σ0 reaction

Scattering phase shift in quantum mechanics on quantum computers

Complete NLO BFKL impact factors for quarkonium hadroproduction in NRQCD: the case of 1S0[1]​, 1S0[8]​, and 3S1[8]​ states

Three-particle scattering amplitudes from lattice QCD

Affiliations

Role of $Σ (1660)$ in the $K^{-} p \to π^{0} π^{0} Σ^{0}$ reaction

Complete NLO BFKL impact factors for quarkonium hadroproduction in NRQCD: the case of $^{1} S_{0}^{[1]}$ , $^{1} S_{0}^{[8]}$ , and $^{3} S_{1}^{[8]}$ states