HEP Lattice·hep-lat

Mon·Aug 17, 2026Monday·August 17, 2026

3 papers—1 primary·2 cross-listed

01
Entanglement spectrum ordering and flavor polarization in the two-flavor Schwinger model at vacuum angle $θ = π$
Boliang Yu🇺🇸 · Ruixin Zhou🇨🇳 · Meisen Gao🇨🇳
Entanglement spectra in gauge theories can encode both symmetry breaking and the organization of gauge sectors. In the two-flavor Schwinger model at vacuum angle $θ = π$ , we find that the joint Schmidt distribution $p_{Q_{A}, F_{A}}$ , labeled by the subsystem gauge charge $Q_{A}$ and flavor imbalance $F_{A}$ , reveals a cut-dependent gauge-sector hierarchy and a mass-induced flavor asymmetry: changing the staggered cut reorganizes the gauge-charge distribution $p_{Q_{A}}$ , while mass imbalance breaks the $F_{A} \leftrightarrow - F_{A}$ symmetry of the conditional flavor distribution $p_{F_{A} ∣ Q_{A}}$ . Defining the combined weight $W_{F}^{(q)} = p_{q, + 1} + p_{q, - 1}$ and conditional polarization $P_{F}^{(q)} = (p_{q, + 1} - p_{q, - 1}) / W_{F}^{(q)}$ , we find that changing the cut reverses the weight hierarchy, $W_{F}^{(- 1)} > W_{F}^{(+ 1)}$ at unit-cell boundaries but $W_{F}^{(+ 1)} > W_{F}^{(- 1)}$ at intra-cell cuts, while mass imbalance drives $P_{F}^{(q)}$ away from zero with a $q$ -dependent cut response. Symmetry resolution therefore separates gauge-sector ordering, sector weight, and flavor polarization that are mixed in the globally ordered entanglement spectrum.
hep-latcond-mat.stat-mechquant-ph0 citations
02
Efficient Hamiltonian Truncation: Fast Matrix Construction and Quantum Krylov Diagonalization
Rachel Houtz🇺🇸 · Marco Knipfer🇺🇸 · Konstantin Matchev🇺🇸 · Alexander Roman🇺🇸 · Mia West🇺🇸
Hamiltonian truncation offers a nonperturbative route to quantum field theory, yet its accuracy is limited by the rapid expansion of the truncated Hilbert space, which drives up computational cost. We tackle this bottleneck with a hybrid strategy that pairs classical and quantum algorithms: 1) we develop an efficient basis-generation scheme built on integer partitions; 2) we speed up the construction of the sparse Hamiltonian matrix using symmetry-aware algorithms; and 3) we explore quantum Krylov diagonalization as a route to the low-lying spectrum. Benchmarking against the free massive scalar and $ϕ^{4}$ theories in two spacetime dimensions, we achieve substantial gains in the computational efficiency of Hamiltonian truncation and chart a path toward future quantum implementations.
↳ quant-phhep-lathep-phhep-th0 citations
03
Enhanced Three-Particle Contribution to Electroweak Penguin $B$ -Meson Decays
Yong-Kang Huang🇨🇳 · Yu-Ming Wang🇨🇳 · Xue-Chen Zhao🇨🇳
We compute for the first time the subleading twist correction to the exclusive rare $b \to {s, d} ℓ^{+} ℓ^{-}$ decays from the three-particle $B$ -meson distribution amplitude at next-to-leading order accuracy by employing the soft-collinear effective theory. This constitutes the last missing ingredient for the complete factorization analysis of the hadronic matrix element of the weak effective Hamiltonian at leading power in the heavy quark expansion. Incorporating further a variety of the next-to-next-to-leading-order QCD corrections to the spectator-scattering amplitude and the weak annihilation topology, we then present the improved field-theoretic predictions for phenomenologically interesting observables in the electroweak penguin $B \to {K, π} ℓ^{+} ℓ^{-}$ decays.
↳ hep-phhep-exhep-lat0 citations

Affiliations

first authorsco-authorsvia INSPIRE

Entanglement spectrum ordering and flavor polarization in the two-flavor Schwinger model at vacuum angle θ=π

Efficient Hamiltonian Truncation: Fast Matrix Construction and Quantum Krylov Diagonalization

Enhanced Three-Particle Contribution to Electroweak Penguin B-Meson Decays

Affiliations

Entanglement spectrum ordering and flavor polarization in the two-flavor Schwinger model at vacuum angle $θ = π$

Enhanced Three-Particle Contribution to Electroweak Penguin $B$ -Meson Decays