The electromomentum effect in piezoelectric Willis scatterers

Materials with asymmetric microstructure can constitutively couple macroscopic fields from different physics. Examples include piezoelectric materials that couple mechanical and electric fields and Willis materials that anomalously couple dynamic and elastic fields. Recently, it was shown anomalous coupling between the elastodynamic and electric field emerges when piezoelectricity is incorporated into Willis materials. Here, we investigate such one-dimensional piezoelectric Willis elements using heuristic homogenization, long-wavelength asymptotic analysis and numerical experiments. We show that an anomalous electromomentum coupling is necessary to explain the scattering properties of the asymmetric piezoelectric media by a macroscopic description that respects reciprocity and energy conservation. Our findings elucidate the origins of the electromomentum coupling and provide insight for the future design of this new class of coupled-field metamaterials.

The top-quark polarization beyond the Standard Model in electron–positron annihilation

Electron–positron annihilation into a pair of top quarks is considered at the energy of the future collider CLIC. Polarization components of the top quark are calculated with the [Formula: see text] and [Formula: see text] interactions which follow from the Lagrangian of the effective field theory of the Standard Model. The polarization vector as a function of the scattering angle is calculated and averaged components of polarization are analyzed as functions of anomalous coupling constants. Extrema of these observables (maxima, minima and saddle points) are studied as functions of the [Formula: see text] energy.

Probing CP-violating WWγ couplings in γp collision at the LHC

We have studied the potential of [Formula: see text] collision at the Large Hadron Collider (LHC) to probe CP (Charge and Parity)-violating anomalous WW[Formula: see text] couplings via the process [Formula: see text]. Considering various integrated luminosities and forward detector acceptance values, we have obtained 95% confidence level (CL) bounds on the anomalous coupling parameters [Formula: see text] and [Formula: see text]. Obtained limits on the coupling parameters have been compared with the current limits.

Search for anomalous quartic WWZγ couplings at the future linear e+e− collider

In this paper, the potentials of two different processes [Formula: see text] and [Formula: see text] at the Compact Linear Collider (CLIC) are examined to probe the anomalous quartic [Formula: see text] gauge couplings. For [Formula: see text], 1.5 and 3[Formula: see text]TeV energies at the CLIC, 95% confidence level limits on the anomalous coupling parameters defining the dimension-six operators are found via the effective Lagrangian approach in a model independent way. The best limits on the anomalous couplings [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] which can be achieved with the integrated luminosity of [Formula: see text] at the CLIC with [Formula: see text] are [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text], respectively.