Sumensari, O. (ORCID:0000000289184808)

DOE OSTI2025

On the EFT validity for Drell–Yan tails at the LHC

Abstract In this article, we examine the validity range of the Effective Field Theory (EFT) description of high-energy Drell–Yan processes at the LHC. To this purpose, we consider explicit mediators that contribute to these processes in the s - and t -channels, comparing their effects in Drell–Yan distributions with the ones obtained by matching onto the corresponding EFT. We determine the conditions for the EFT results to accurately describe these scenarios. In particular, we explore the impact of including dimension-eight $$(d=8)$$ ( d = 8 ) operators in the faster convergence of the EFT series, at the analytical and numerical level, considering contributions to the cross section up to the square of $$d=8$$ d = 8 EFT operator insertions. Moreover, we discuss the possible implications of clipping LHC data and illustrate results for a specific New-Physics scenario motivated by low-energy flavor data.

Allwicher, L. (ORCID:0000000269561661)↗

DOE OSTI2023

Probing lepton flavor violation in meson decays with LHC data

Abstract In this letter, we use LHC data from the Drell–Yan processes $$pp\rightarrow \ell _i\ell _j$$ p p → ℓ i ℓ j (with $$i\ne j$$ i ≠ j ) to derive model-independent upper limits on lepton-flavor-violating meson decays. Our analysis is based on an Effective Field Theory (EFT) approach and it does not require a specific assumption regarding the basis of effective operators. We find that current LHC data (140 $$\textrm{fb}^{-1}$$ fb - 1 ) already provides competitive limits on $${\mathcal {B}}(B\rightarrow \pi e \tau )$$ B ( B → π e τ ) and $${\mathcal {B}}(B\rightarrow \pi \mu \tau )$$ B ( B → π μ τ ) with respect to the ones obtained through experimental searches at the B -factories. Moreover, we derive upper limits on several decays that have not been searched for experimentally yet, such as $$D^0\rightarrow e\tau $$ D 0 → e τ in the charm sector, and various semileptonic decays such as $$B\rightarrow \rho \mu \tau $$ B → ρ μ τ , $$B_s\rightarrow K \mu \tau $$ B s → K μ τ and $$B_s\rightarrow \phi \mu \tau $$ B s → ϕ μ τ . Lastly, we discuss the validity of the EFT description of LHC data and the impact of loop corrections in our analysis.

Descotes-Genon, S.↗