Searcharxiv⌕ Search

arXiv subjects

Maurice Benayoun

Publications and source records attributed to Maurice Benayoun.

6 recordsLinked to original sources
arXiv2026

Balancing Evidence and Interpretation: Historical Grounding Ratio as a Design Parameter for AI-Generated Urban Storytelling

Location-aware generative systems can now select historical archives and real-time contextual information based on a user's surroundings to automatically generate narratives for urban heritage walks. Yet when multiple sources jointly inform generation, existing systems provide neither a clear representation of how much content from each source actually appears in the output nor an operational means of measuring it. We introduce the Historical Grounding Ratio (HGR), defined as the proportion of claim-bearing information units in a generated narrative that are supported by historical archives. HGR turns the realized share of historical evidence in a narrative into a directly measurable design parameter. In GeoDrama, a mobile narrative system, we created three conditions that used a common retrieval procedure and comparable evidence-bundle sizes while varying the allocation of information from different sources during generation. We evaluated how changes in HGR affected narrative experience through a within-subject walking study with 18 participants. Increasing HGR significantly strengthened the perceived relevance between narrative content and the specific location. However, historical understanding, integration with the visible scene, appropriateness of the amount of information, and intention to explore further did not increase monotonically with HGR; all four measures were highest in the intermediate, balanced condition. These findings show that designing location-aware generative interfaces involves not only retrieving relevant material but also determining how information from different sources composes the final output. HGR offers an operational measure for comparing information-allocation strategies and their experiential consequences.

cs.HC↗
arXiv2024

The $η/η' \rightarrow π^+ π^- γ$ Decays within BHLS$_2$ and the Muon HVP

The departure of the latest FNAL experimental average for the muon anomalous magnetic moment $a_μ=(g_μ-2)/2$ measurements having increased from $4.2 σ$ to $5.0 σ$, with respect to the White Paper consensus, it may indicate a hint for new physics. As the most delicate piece of $a_μ$ is its leading order HVP part $a_μ^{HVP-LO}$, methods to ascertain its theoretical value are crucial to interpret this discrepancy. We propose to examine the dipion spectra from the $η/η' \rightarrow π^+ π^- γ$ decays in the Hidden Local Symmetry (HLS) context using its BHLS$_2$ broken variant. We thus have at our disposal a framework where the close relationship of the dipion spectra from the $η/η'$ and $τ$ decays and of the $e^+e^- \to π^+π^-$ annihilation can be simultaneously considered. A special focus is put to the high statistic dipion spectra from the $η$ decay collected by the KLOE/KLOE2 Collaboration and $η'$ decay collected by the BESIII Collaboration, and it is shown that the BHLS$_2$ framework provides a fair account of their dipion spectra. More precisely, it is first proven that a single Omnès representation real polynomial is requested, common to both the $η$ and $η'$ dipion spectra. Moreover, it is shown that fits involving the $η/η'/τ$ dipion spectra, and excluding the $e^+e^- \to π^+π^-$ annihilation data, allow for a prediction of the pion vector form factor data $F_π(s)$ which fairly agree with the usual dipion spectra collected in the $e^+e^- \to π^+π^-$ annihilation channel. Even if more precise $η/η'/τ$ dipion spectra would help to be fully conclusive, this confirms the Dispersive Approach results for $a_μ^{HVP-LO}$ and points towards a common non experiment-dependent origin to this tension with the now well accepted LQCD result.

hep-ph↗
arXiv2022

BHLS$_2$ Upgrade : $τ$ spectra, muon HVP and the [$π^0,~η,~η^\prime$] System

The generic Hidden Local Symmetry (HLS) model has given rise to the BHLS$_2$ variant which introduces symmetry breaking in the vector meson sector; the central mechanism is a modification of the covariant derivative at the root of the HLS approach. However, the description of the Belle $τ$ dipion spectra is not satisfactory whereas the dealing with its annihilation sector ($e^+ e^- \rightarrow π^+ π^-/π^+ π^-π^0/ π^0 γ/ηγ/K^+ K^-/K_L K_S$) is optimum. This issue is solved by an additional breaking term allowing to include the $[π^0,η,η^\prime]$ system. This extension of the usual 't~Hooft determinant term only affects the BHLS$_2$ kinetic energy term. One obtains a fair account for the $τ$ dipion spectra as well as for the annihilation channels. The Belle dipion spectrum provides evidence for a violation of CVC in the $τ$ lepton decay; this evidence is strengthened by imposing the conditions $<0|J_μ^q |[q^\prime \overline{q^\prime}](p)>=ip_μf_q δ_{q q^\prime }, \{ [q \overline{q}], q=u,d,s\}$ on BHLS$_2$ axial current matrix elements. BHLS$_2$ is found to recover the usual (completed) formulae for the [$π^0,~η,~η^\prime$] mixing parameters and the global fits return mixing parameter values in agreement with expectations and better uncertainties. Updating the muon HVP, one argues that the strong tension between the KLOE and BaBar pion form factors imposes to provide two solutions : $a_μ^{HVP-LO}({\rm KLOE})=687.31 \pm 2.93$ and $a_μ^{HVP-LO}({\rm BaBar})=692.36 \pm 2.95$, in units of $10^{-10}$, rather than some combination of these. Taking into account common systematics, their differences with the experimental BNL-FNAL average value exhibit significances $> 5.4σ$ (KLOE) and $> 4.1σ$ (BaBar) with fit probabilities favoring the former.

hep-ph↗
arXiv2015

The HLS approach to $(g-2)_μ$~: A Solution to the "$τ$ versus $e^+e^- $" Puzzle

The Hidden Local Symmetry (HLS) Model provides a framework able to encompass several physical processes and gives a unfied description of these in an energy range extending up to the $ϕ$ mass. Supplied with appropriate symmetry breaking schemes, the HLS Model gives a broken Effective Lagrangian (BHLS). The BHLS Lagrangian gives rise to a fit procedure in which a simultaneous description of the $e^+ e^-$ annihilations to $π^+π^-$, $π^0 γ$, $ηγ$, $π^+π^- π^0$, $K^+ K^-$, $K_L K_S$ and of the dipion spectrum in the decay $τ^\pm \rightarrow π^\pm π^0 ν$ can be performed. Supplemented with a few pieces of information on the $ρ^0-ω-ϕ$ system, the $τ$ dipion spectrum is shown to predict accurately the pion form factor in $e^+ e^-$ annihilations. Physics results derived from global fits involving or excluding the $τ$ dipion spectra are found consistent with each others. Therefore, no obvious mismatch between the $τ$ and $e^+e^- $ physics properties arises and the $τ-e^+e^- $ puzzle vanishes within the broken HLS Model.

hep-ph↗
arXiv2008

Effects of the (rho, omega, phi) mixing on the dipion mass spectrum in e+ e- annihilation and tau decay

A way to explain the puzzling difference between the pion form factor as measured in e+ e- annihilations and in tau decays is discussed. We show that isospin symmetry breaking, beside the already identified effects, produces also a full mixing between the rho0, omega and phi mesons which generates an isospin 0 component inside the rho0 meson. This effect, not accounted for in current treatments of the problem, seems able to account for the apparent mismatch between e+ e- and tau data below the phi mass.

hep-ph↗