Naive $T$-odd Drell-Yan angular coefficients as a probe of the dimension-8 SMEFT

TL;DR

This paper introduces naive T-odd Collins-Soper moments in Drell-Yan processes as novel probes for dimension-8 SMEFT operators, potentially revealing new physics at the TeV scale.

Contribution

It identifies specific angular coefficients sensitive to dimension-8 CP-odd operators and assesses their potential to probe new physics at the LHC.

Findings

High invariant mass and transverse momentum regions enhance sensitivity.

Projected LHC luminosity can probe effective scales of a few TeV.

Naive T-odd moments provide a new avenue for SMEFT exploration.

Abstract

We propose the ``naive" $T$-odd Collins-Soper moments in the Drell-Yan process as probes of previously unexplored directions in the Standard Model Effective Field Theory (SMEFT) parameter space. We show that the moments $A_6$ and $A_7$ in the high invariant mass and transverse momentum region are sensitive to dimension-8 $CP$-odd semi-leptonic four-fermion operators with an additional gluon field strength tensor. Using the projected integrated luminosity of a future high-luminosity LHC, we show that effective ultraviolet scales in the few-TeV range can be probed with this process.