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Tag: Quantum Chromodynamics and Particle Interactions

  • Adjoint QCD2 can exhibit supersymmetry at specific fermion masses

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    What the study found The study finds that a 1+1-dimensional SU(N) gauge theory with an adjoint Majorana fermion, called adjoint QCD2, exhibits supersymmetry when the fermion mass is set to a specific value. It also identifies related models in which a supersymmetric massive sector coexists with a non-supersymmetric conformal field theory (CFT, a theory describing…

  • Mean-field approaches qualitatively capture heavy-quark QCD phase behavior

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    What the study found The study finds that three mean-field approximations applied to effective Polyakov loop theories can qualitatively determine the phase diagram of lattice QCD with heavy quarks using fully analytical methods. It also reports a first-order nuclear liquid-gas transition with a critical end point at very low temperatures and moderately heavy quarks. Why…

  • Toponium masses estimated from QCD sum rules

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    What the study found The study estimates masses for purely top-quark bound states: pseudoscalar toponium (η_t), vector toponium (ψ_t), and the triply-top baryon (Ω_ttt). The authors report that the pseudoscalar toponium estimate is consistent with near-threshold events seen in recent experiments, and that the Ω_ttt central mass slightly exceeds the sum of the three top-quark…

  • Modified PYTHIA mPDFs better satisfy symmetry and sum rules

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    What the study found A modified algorithm based on PYTHIA produces equal-scale multi-parton distribution functions that are symmetric and satisfy the relevant sum rules more closely than earlier PYTHIA-based results. Why the authors say this matters The authors state that multi-parton distribution functions are important for predicting multiple scattering rates at hadron colliders, and the…

  • ANATAR is a Mathematica package for multi-loop computations

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    What the study found ANATAR is a new Mathematica package for multi-loop computations. It integrates several existing tools for higher-order amplitude generation and analysis, and it is described as efficient, user-friendly, and flexible. Why the authors say this matters The authors say ANATAR provides a platform for higher-order computations and is optimized for computations in…

  • Axion interaction Lagrangian includes WZW terms and meson decays

    Axion interaction Lagrangian includes WZW terms and meson decays

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    Complete Lagrangian for axion interactions with mesons incorporating Wess-Zumino-Witten terms and instanton effects, enabling consistent predictions for axion decay widths.