Bottom quark electroweak dipole moments at a high-energy $\hat{I}¼-$collider

Abstract

We study the sensitivity of a high-energy $\hat{I}¼-$collider with center of mass energy in the multi--TeV range in testing electroweak dipole interactions of the $b-$quark. We parametrize the relevant deformations in the language of the Standard Model effective field theory, where the dominant modifications arise at the $d=6$ level. We analyse $\hat{I}{¼}^{+}\hat{I}{¼}^{-}\to b\bar{b}$ and $\hat{I}{¼}^{+}\hat{I}{¼}^{-}\to b\bar{b}h$ scatterings, performing a study at the level of a fast detector simulation. Owing the chiral structure of the dipole interaction, the study of the $\hat{I}{¼}^{+}\hat{I}{¼}^{-}\to b\bar{b}h$ process allows to enforce the stronger bounds on the Wilson coefficients of the $d=6$ operators. The limits that can be obtained surpass present and future bounds from EW precision measurements also improving upon the ones arising from the measurement of the $\hat{I}”F=1$ transitions $B\to X_s{\hat{I}}^3$.

14 pages, 6 figures, 3 tables