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<p>Estimating decay parameters in lattice simulations is a computationally demanding problem, requiring several volumes and momenta. We explore an alternative approach, where the transition amplitude can be extracted from the spectral decomposition of particular ratios built from correlation functions. This so-called ratio method has the advantage of not needing various irreducible representations or volumes, and it allows us to predict the decay width Γ and the energy shift <i>ϵ</i> of the spectrum directly. In this work, we apply this method to study the hadronic decay <i>ψ</i>(3770) → <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="13130_2025_26013_Article_IEq1.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="33" /> </InlineMediaObject> <EquationSource Format="MATHML"><math display="inline"> <mover accent="true"> <mi>D</mi> <mo stretchy="true">¯</mo> </mover> <mi>D</mi> </math></EquationSource> <EquationSource Format="TEX">\( \overline{D}D \)</EquationSource> </InlineEquation> on two CLS <i>N</i><sub>f</sub> = 2 ensembles. This approach requires close to on-shell kinematics to work, and we employ twisted boundary conditions to precisely tune the on-shell point. Although our study is yet to approach the continuum limit, we find a value of Γ fully compatible to the physical result, and <i>ϵ</i> informs us by how much our spectrum would shift in a fully dynamical simulation. Besides lattice calculations, many analytical tools have been proposed to understand decay processes. A relatively simple, early example is the <sup>3</sup><i>P</i><sub>0</sub> quark model, which provides a physical insight of the decay process.</p>

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Hadronic decay of vector charmonium from the lattice

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年4月17日

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  • Benoît Blossier,
  • Jochen Heitger,
  • Jan Neuendorf,
  • Teseo San José

摘要

Estimating decay parameters in lattice simulations is a computationally demanding problem, requiring several volumes and momenta. We explore an alternative approach, where the transition amplitude can be extracted from the spectral decomposition of particular ratios built from correlation functions. This so-called ratio method has the advantage of not needing various irreducible representations or volumes, and it allows us to predict the decay width Γ and the energy shift ϵ of the spectrum directly. In this work, we apply this method to study the hadronic decay ψ(3770) → D ¯ D \( \overline{D}D \) on two CLS Nf = 2 ensembles. This approach requires close to on-shell kinematics to work, and we employ twisted boundary conditions to precisely tune the on-shell point. Although our study is yet to approach the continuum limit, we find a value of Γ fully compatible to the physical result, and ϵ informs us by how much our spectrum would shift in a fully dynamical simulation. Besides lattice calculations, many analytical tools have been proposed to understand decay processes. A relatively simple, early example is the 3P0 quark model, which provides a physical insight of the decay process.