Tag: Nuclear and High Energy Physics
Next-to-leading power terms can be significant in slepton pair production
What the study found Next-to-leading power contributions in the threshold variable can be significant for inclusive slepton pair production. The authors also report that existing calculations underestimate the scale error for large slepton masses. Why the authors say this matters The study suggests that accounting for these next-to-leading power effects is important when assessing theoretical…
Unified framework links CP-violating Higgs parametrisations
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What the study found The study provides a unified framework for relating different ways of describing CP-violating Higgs boson interactions. It also constructs explicit dictionaries to translate between commonly used parametrisations. Why the authors say this matters The authors say this matters because differing conventions and assumptions across the literature make translation between parametrisations nontrivial…
Semi-visible dark jets may be probed at FCC-ee
What the study found The study finds that Higgs-boson-mediated production of dark quarks at the Future Circular Collider in electron-positron collisions could produce semi-visible jets, meaning jets made of both visible and invisible particles. The authors report that a graph neural network jet tagger helps improve sensitivity, especially when the invisible part of the signal…
Adjoint QCD2 can exhibit supersymmetry at specific fermion masses
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…
Compact formula for conserved three-point tensor structures in 4D CFT
What the study found The study found a compact analytic formula for a complete basis of conformally invariant tensor structures for three-point functions of conserved operators in four-dimensional conformal field theory (CFT). It also found that the same framework can be used for cases with one non-conserved operator. Why the authors say this matters The…
Mean-field approaches qualitatively capture heavy-quark QCD phase behavior
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…
Scalar leptoquarks help fermionic dark matter evade direct detection
What the study found The study finds that adding scalar leptoquarks to a vector-like lepton dark matter model can change the dark matter candidate so it better avoids direct detection limits. The added interactions can split the neutral dark matter state into two non-degenerate pseudo-Dirac states and enlarge the parameter space that can reproduce the…
Massive Type IIA solutions model monodromy defects in 5d and 6d theories
What the study found The study proposes massive Type IIA supergravity solutions as duals of co-dimension 2 monodromy defects in 6d (1,0) conformal field theories and in the 5d Sp(N) fixed point theory. It also reports evidence that, for 3d defects, the defect entanglement entropy can be written as a linear combination of the defect…
Neutron-capture uncertainties limit r-process residuals
What the study found Some r-process, or rapid neutron-capture, isotope residuals in the solar system remain significantly uncertain because uncertainties in s-process, or slow neutron-capture, abundances propagate into them. Why the authors say this matters The authors say this is important because r-process residuals are used as a benchmark in stellar models of explosive nucleosynthesis,…
Weak gravity bound extended to AdS settings
What the study found The authors extend a recent proposal for the Weak Gravity Conjecture (WGC) in anti-de Sitter (AdS) space to more general effective field theories. They report that, when moduli are present, the relevant condition is that a particle produced by Schwinger effect during an extremal black hole decay is repelled close to…
