Probing dark sector <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math> violation with electric dipole moments and colliders
Bibliographic record
Abstract
We study the experimental constraints on $CP$ violation originating in a dark sector that communicates with the Standard Model through a Higgs portal coupling ${H}^{\ifmmode\dagger\else\textdagger\fi{}}H{Z}_{\ensuremath{\mu}\ensuremath{\nu}}^{\ensuremath{'}}{\stackrel{\texttildelow{}}{Z}}^{\ensuremath{'}\ensuremath{\mu}\ensuremath{\nu}}$, where the ${Z}^{\ensuremath{'}}$ is from a new $U(1)$ gauge symmetry which is assumed to couple to lepton number. We compute explicitly the leading two-loop contribution of this effective operator to the electron electric dipole moment (EDM) and show that the resulting constraints are comparable to those from direct ${Z}^{\ensuremath{'}}$ searches at electron-positron colliders when the effective operator is generated at tree level. We also examine an explicit UV completion for this effective operator that was first introduced to achieve electroweak baryogenesis and show that collider constraints from $B$ factories already exclude viable baryogenesis for ${Z}^{\ensuremath{'}}$ masses below 10 GeV, and that future electron-positron Higgs factories will exclude viable baryogenesis for ${Z}^{\ensuremath{'}}$ masses up to the ${e}^{+}{e}^{\ensuremath{-}}$ center-of-mass energy if anticipated luminosities are achieved. For higher ${Z}^{\ensuremath{'}}$ masses, the full viable baryogenesis parameter space lies within 6 orders of magnitude of the current upper bound on the electron EDM.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.001 | 0.001 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".