Precision Drell-Yan Measurements at the LHC and Implications for the Diphoton Excess

TL;DR

This paper uses precise Drell-Yan cross section measurements at the LHC to constrain new physics models, especially those explaining the 750 GeV diphoton excess, showing LHC data surpasses LEP constraints.

Contribution

It provides a detailed analysis of how LHC Drell-Yan data constrains models for the diphoton excess, surpassing previous LEP bounds and projecting future LHC reach.

Findings

LHC Drell-Yan data constrains new electroweak-charged states.

LHC14 results will probe most of the relevant parameter space.

LHC constraints are stronger than LEP EW precision tests.

Abstract

Precision measurements of the Drell-Yan (DY) cross section at the LHC constrain new physics scenarios that involve new states with electroweak (EW) charges. We analyze these constraints and apply them to models that can address the LHC diphoton excess at 750 GeV. We confront these findings with LEP EW precision tests and show that DY provides stronger constraints than the LEP data. While 8 TeV data can already probe some parts of the interesting region of parameter space, LHC14 results are expected to cover a substantial part of the relevant terrain. We derive the bounds from the existing data, estimate LHC14 reach and compare them to the bounds one gets from LEP and future FCC-ee precision measurements.