Odd Physics Off the Diagonal: Constraining CP-violating SMEFT with Quantum Tomography

• URL: http://arxiv.org/abs/2604.21857v2
• Date: Fri, 24 Apr 2026 16:10:47 GMT
• Title: Odd Physics Off the Diagonal: Constraining CP-violating SMEFT with Quantum Tomography
• Abstract summary: We exploit the full signature of Beyond-SM physics, including the pure quadratic NP terms.<n>We show that this approach provides superior simultaneous sensitivity to characteristic features of CP-even and CP-odd contributions.
• Score: 39.146761527401424
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: New sources of charge-parity (CP) violation beyond those described in the Standard Model (SM) are required to explain the observed matter--antimatter asymmetry of the Universe. The Standard Model Effective Field Theory (SMEFT) provides a framework to introduce additional electroweak sources of CP-odd physics in a model-independent manner. However, these CP-violating signatures are mostly degenerate to CP-even SMEFT operators in polarisation-blind observables, distinguishable only in the SM-New Physics (NP) interference using the azimuthal decay angle. Using Quantum Tomography techniques, we present a new approach to constraining these NP effects. Reconstructing the spin density matrix (SDM) of a diboson system, we go beyond `interference resurrection' to exploit the full signature of the Beyond-SM physics, including the pure quadratic NP terms. We show that this approach provides superior simultaneous sensitivity to characteristic features of CP-even and CP-odd contributions, including effects not fully captured by traditional angular observables.

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