HEP Lattice·hep-lat

Mon·Jul 13, 2026Monday·July 13, 2026

7 papers—0 primary·7 cross-listed

01
Renormalon subtracted nonrelativistic QCD for heavy hadron systems
Benoît Assi🇺🇸 · Andreas S. Kronfeld🇺🇸 · Simon Vaiva🇺🇸 · Michael L. Wagman🇺🇸
We present a renormalon-subtracted formulation of potential nonrelativistic QCD (pNRQCD) for precision spectroscopy of heavy hadron systems, combining variational and Green's function Monte Carlo (VMC/GFMC) methods with NNLO static two- and three-body potentials. Minimal renormalon subtraction (MRS) systematically sums leading factorially growing terms, thereby stabilizing perturbative convergence and reducing renormalization-scale dependence. We tune charm and bottom quark masses to spin-averaged $1 S$ quarkonium states and predict $Ω_{ccc}$ , $Ω_{cc b}$ , $Ω_{c bb}$ , and $Ω_{bbb}$ baryon masses, as well as QCD-stable baryons containing top quarks. NNLO MRS results undershoot lattice QCD by 125--175~MeV, with fractional differences decreasing as $\sim 1/ m_{Q}$ , consistent with neglected $O (1/ m_{Q})$ corrections. Applying these methods to unequal-mass fully-heavy tetraquarks, we determine the critical heavy-to-light mass ratio for binding and compute binding energies across the mass-ratio landscape.
↳ hep-phhep-exhep-lat0 citations
02
Hunting for new physics in $B$ meson $b \to u$ transitions: A fresh look with Belle II data
Pietro Colangelo🇮🇹 · Fulvia De Fazio🇮🇹 · Maria Letizia Di Cuia · Davide Milillo🇮🇹
We present an analysis of the decays $B^{-} \to ℓ^{-} ν ˉ_{ℓ}$ , $B ˉ^{0} \to π^{+} ℓ^{-} ν ˉ_{ℓ}$ , and $B^{-} \to ρ^{0} ℓ^{-} ν ˉ_{ℓ}$ leveraging the precise measurements of binned differential branching fractions recently reported by the Belle II Collaboration for the semileptonic modes. We adopt a generalized low-energy Hamiltonian that incorporates all dimension-six operators with left-handed neutrinos -- consistent with the Standard Model effective field theory (SMEFT) -- featuring complex, lepton-flavor-dependent Wilson coefficients. For three representative values of $∣ V_{u b} ∣$ , we perform a fit to the measured $q^{2}$ -binned observables to constrain the coupling parameter space and determine the corresponding confidence regions. Finally, we perform a global fit for the three decay channels, determining $∣ V_{u b} ∣$ together with the new physics couplings.
↳ hep-phhep-exhep-lat0 citations
03
Tensor-polarized parton distribution functions of the deuteron by a convolution model
S. Kumano🇨🇳 · Kenshi Kuroki🇨🇳
Tensor-polarized parton distribution functions (PDFs) are calculated for the deuteron by using a convolution formalism, where the tensor-polarized PDFs are given by the corresponding nucleon's unpolarized PDFs convoluted with the tensor-polarized nucleon momentum distribution in the deuteron. These distributions are obtained at $Q^{2} = 2.5$ GeV $^{2}$ in order to compare with the tensor-polarized PDFs which were determined by HERMES $b_{1}$ data. The obtained distributions are very different from the ones determined from the HERMES data, which indicates further studies are needed to clarify the difference, possibly by considering a new mechanism beyond the simple bound system of a proton and a neutron. The obtained PDFs $δ_{T} q$ and $δ_{T} q ˉ$ are converted to the PDFs of the Trento convention $f_{1 LL}^{q}$ and $f_{1 LL}^{q ˉ}$ , and they are used for estimating the twist-3 PDFs $f_{L T}^{q}$ and $f_{L T}^{q ˉ}$ by using a Wandzura-Wilczek-like relation. Because deep-inelastic-scattering experiments are under preparation for structure functions with a tensor-polarized deuteron target at the Thomas Jefferson National Accelerator Facility, and a Drell-Yan experiment will be possible at hadron accelerator facilities, such as the Fermi National Accelerator Laboratory, the obtained tensor-polarized PDFs will be tested experimentally.
↳ hep-phhep-exhep-latnucl-ex+10 citations
04
Diffusion Monte Carlo study of deuteron-like fully light hexaquarks
M.C. Gordillo🇪🇸 · J. Segovia🇪🇸
We perform a Diffusion Monte Carlo study of fully light hexaquarks containing three $u$ quarks and three $d$ quarks within a constituent-quark model. Both compact and baryon--baryon-like arrangements were considered separately. All compact hexaquark configurations are found well above their corresponding baryon--baryon thresholds, suggesting that deeply bound compact six-quark states are not favored in the light-quark sector within this model. By contrast, several dibaryon-like configurations lie close, but above, to the $N N$ , $N Δ$ , and $ΔΔ$ thresholds and show spatial structures compatible with molecular states. One configuration exhibits two well-defined nucleon-like subclusters separated by several femtometers, characteristic of deuteron-like spatial clustering, although its calculated energy remains slightly above the corresponding threshold.
↳ hep-phhep-exhep-latnucl-ex+10 citations
05
Fully-beauty tensor tetraquark
S. S. Agaev🇦🇿 · K. Azizi🇮🇷 · H. Sundu🇹🇷
Parameters of the fully-beauty tensor tetraquark $T = bb b b$ are computed using QCD sum rule method. The mass $m$ and coupling $Λ$ of this state are evaluated by means of two-point sum rule approach. Prediction $m = (18530 \pm 86) MeV$ for the mass demonstrates that $T$ is stable against decays to pairs of $η_{b} η_{b}$ and $ΥΥ$ mesons. But it transforms to conventional particles due to $b b$ annihilations to light quarks $q q$ and $s s$ followed by creation of mesons $B^{(*) +} B^{(*) -}$ , $B^{(*) 0} B^{(*) 0}$ and $B_{s}^{(*) 0} B_{s}^{(*) 0}$ . Partial width of these decay channels are calculated by invoking technical tools of three-point sum rule method. The latter allows us to estimate strong couplings at relevant tetraquark-meson-meson vertices and, hence, a width of the process under consideration. Our prediction $Γ = (48 \pm 6) MeV$ along with the mass of this state can be valuable for experimental studies of all-heavy resonances.
↳ hep-phhep-exhep-lat0 citations
06
Perusing confining pseudoreal theories: a story of emerging massless spin-1 bosons
Giacomo Cacciapaglia🇫🇷 · Konstantinos Kollias🇪🇸
Solving quantum field theory, which is at the basis of the standard model of particle interactions, is one of the main tasks of contemporary theoretical physics. Minimal asymptotically free pseudoreal theories, containing one or two species of massless Weyl fermions in pseudoreal representations of the gauge group, flow towards a poorly understood infrared dynamics. We provide a comprehensive study of all pseudoreal theories, identifying the ones that likely flow towards a conformal dynamics, while we show that the remaining ones confine with a non-trivial condensate dynamics. Among the latter, all but one one-species theories feature a massless spin-1 state. Instead, the only confining two-species theory likely features two massless spin-1 states and one Nambu-Goldstone boson. These predictions could be further tested, for instance by use of Lattice simulations, the functional renormalization group, and supersymmetric analogs.
↳ hep-thhep-lathep-ph1 citation
07
SCET sum rules for $B \to D_{1} (2420)$ and $B \to D_{1}^{'} (2430)$ form factors at next-to-leading order
Jun-Wei Zhang🇨🇳 · Yong-Kang Huang🇨🇳
We present the first calculation of the $B \to D_{1} (2420)$ and $B \to D_{1}^{'} (2430)$ transition form factors at $O (α_{s})$ using light-cone sum rules within the framework of soft-collinear effective theory (SCET). We first match the QCD transition currents onto $SCE T_{I}$ and then factorize the corresponding vacuum-to- $B$ -meson correlation functions in $SCE T_{II}$ . The resulting factorization formulae are used to construct the leading-power sum rules for the effective SCET form factors $ξ_{∥ / ⊥}^{R}$ and $Ξ_{∥ / ⊥}^{R}$ ( $R = D_{1}, D_{1}^{'}$ ). In particular, we calculate the additional longitudinal form factor $ξ_{∥, m_{c}}^{R}$ induced by the finite charm-quark mass, whose contribution depends only on the $B$ -meson light-cone distribution amplitude $ϕ_{B}^{+} (ω, μ)$ . To disentangle the mixed $D_{1}$ and $D_{1}^{'}$ states, we introduce dedicated combinations of interpolating currents, with their decay constants determined via the equations of motion. To isolate the orbitally excited states from ground-state contamination, we subtract the ground-state contribution from the total sum rules and examine the stability of the resulting sum rules. Furthermore, the $q^{2}$ -dependence of the physical form factors is extrapolated over the full kinematic region using the Bourrely--Caprini--Lellouch parameterization. Finally, we provide phenomenological predictions for the branching fractions, differential decay widths, and lepton flavor universality ratios. Numerically, we obtain $R (D_{1}) = 0.07 0_{- 0.018}^{+ 0.028}$ and $R (D_{1}^{'}) = 0.15 9_{- 0.025}^{+ 0.032}$ , which can be confronted with the future measurements at Belle~II and LHCb.
↳ hep-phhep-exhep-lat1 citation

Affiliations

first authorsco-authorsvia INSPIRE

Renormalon subtracted nonrelativistic QCD for heavy hadron systems

Hunting for new physics in B meson b→u transitions: A fresh look with Belle II data

Tensor-polarized parton distribution functions of the deuteron by a convolution model

Diffusion Monte Carlo study of deuteron-like fully light hexaquarks

Fully-beauty tensor tetraquark

Perusing confining pseudoreal theories: a story of emerging massless spin-1 bosons

SCET sum rules for B→D1​(2420) and B→D1′​(2430) form factors at next-to-leading order

Affiliations

Hunting for new physics in $B$ meson $b \to u$ transitions: A fresh look with Belle II data

SCET sum rules for $B \to D_{1} (2420)$ and $B \to D_{1}^{'} (2430)$ form factors at next-to-leading order