Monolepton production in SMEFT to $$ \mathcal{O} $$(1/Λ4) and beyond

Abstract

Abstract We calculate pp → ℓ+ν, ℓ−$$ \overline{\nu} $$ ν ¯ to $$ \mathcal{O} $$ O (1/Λ4) within the Standard Model Effective Field Theory (SMEFT) framework. In particular, we calculate the four-fermion contribution from dimension six and eight operators, which dominates at large center of mass energy. We explore the relative size of the $$ \mathcal{O} $$ O (1/Λ4) and $$ \mathcal{O} $$ O (1/Λ2) results for various kinematic regimes and assumptions about the Wilson coefficients. Results for Drell-Yan production pp → ℓ+ℓ− at $$ \mathcal{O} $$ O (1/Λ4) are also provided. Additionally, we develop the form for four fermion contact term contributions to pp → ℓ+ν, ℓ−$$ \overline{\nu} $$ ν ¯ , pp → ℓ+ℓ− of arbitrary mass dimension. This allows us to estimate the effects from even higher dimensional (dimension > 8) terms in the SMEFT framework.