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Nuclear Theory·nucl-th

Friday·July 19, 2024

6 papers—2 primary·4 cross-listed

All6Primary2Cross-lists4
  1. 03

    Identifying the two-pole structure of the using an SU(3) flavor filter

    Ying-Bo He🇨🇳 · Xiao-Hai Liu🇨🇳 · Li-Sheng Geng🇨🇳 · Feng-Kun Guo🇨🇳 · Ju-Jun Xie🇨🇳

    We propose a novel method to identify the two-pole structure of the . The two poles owe their origin to different quark flavor irreducible representations in the meson-baryon coupled-channel interactions, thus they should be individually manifested in reactions that provide good flavor eigenstate sources. Hadronic decays of charmonia into and are such reactions, and the flavor octet and singlet poles can be approximately singled out in these two decay modes. This SU(3) flavor filter works even considering the flavor symmetry breaking. With the huge charmonium data sets collected, it is therefore promising to solve the long-standing puzzle employing the proposed flavor filter.

    ↳ hep-phhep-exnucl-thPRD(2026)·11 citations
  2. 04

    Dimuon and ditau production in photon-photon collisions at next-to-leading order in QED

    Hua-Sheng Shao🇫🇷 · David d'Enterria🇨🇭

    Next-to-leading-order (NLO) quantum electrodynamics (QED) corrections to the production of muon and tau pairs in photon-photon collisions, , are calculated in the equivalent photon approximation. We mostly consider processes in ultraperipheral collisions of hadrons at the LHC, but the process in collisions at LEP is also discussed. The NLO terms are found to modify the total fiducial cross sections by up to 5%, increasing the tails of the dilepton acoplanarity and transverse momentum distributions, and depleting by up to 15% the yields at high masses, with respect to the leading-order predictions including the very small virtuality of the colliding photons. At the LHC, the calculations obtained with the charge form factor for protons and lead ions including the NLO QED corrections improve the data--theory agreement for all measured differential distributions, and prove an indispensable ingredient for the extraction of precision quantities in photon-photon processes, such as the anomalous magnetic moment of the tau lepton.

    ↳ hep-phhep-exnucl-exnucl-thJHEP(2025)·22 citations
  3. 05

    Systematic input scheme of many-boson Hamiltonians with applications to the two-dimensional theory

    Weijie Du🇺🇸 · James P. Vary🇺🇸

    We develop a novel, systematic input scheme for many-boson Hamiltonians in order to solve field theory problems within the light-front Hamiltonian formalism via quantum computing. We present our discussion of this input scheme based on the light-front Hamiltonian of the two-dimensional theory. In our input scheme, we employ a set of quantum registers, where each register encodes the occupation of a distinct boson mode as binaries. We squeeze the boson operators of each mode and present the Hamiltonian in terms of unique combinations of the squeezed boson operators. We design the circuit modules for these unique combinations. Based on these circuit modules, we block encode the many-boson Hamiltonian utilizing the idea of quantum walk. For demonstration purposes, we present the spectral calculations of the Hamiltonian utilizing the hybrid quantum-classical symmetry-adapted quantum Krylov subspace diagonalization algorithm based on our input scheme, where the quantum computations are performed with the IBM Qiskit quantum simulator. The results of the hybrid calculations agree with exact results.

    ↳ quant-phhep-thnucl-thPRD(2025)·10 citations
  4. 06

    Josephson currents in neutron stars

    Armen Sedrakian · Peter B. Rau

    We demonstrate that the interface between -wave and -wave paired superfluids in neutron stars induces a neutron supercurrent, a charge-neutral analog of the Josephson junction effect in electronic superconductors. The proton supercurrent entrainment by the neutron superfluid generates, in addition to the neutral supercurrent, a charged current across the interface. Beyond this stationary effect, the motion of the neutron vortex lines responding to secular changes in the neutron star's rotation rate induces a time-dependent oscillating Josephson current across this interface when proton flux tubes are dragged along with them. We show that such motion produces radiation from the interface once clusters of proton flux tubes intersect the interface. The power of radiation exceeds by orders of magnitude the Ohmic dissipation of currents in neutron stars. This effect appears to be phenomenologically significant enough to heat the star and alter its cooling rate during the photon cooling era.

    ↳ astro-ph.HEcond-mat.supr-connucl-thPRD(2025)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE