LHC bounds on large extra dimensions
Roberto Franceschini, Gian Francesco Giudice, Pier Paolo Giardino,, Paolo Lodone, Alessandro Strumia
TL;DR
This paper establishes new limits on large extra dimensions by analyzing LHC dijet data, refining constraints on quantum gravity scales through detailed comparison of graviton exchange effects.
Contribution
It provides the first comprehensive bounds on effective operators from graviton exchange using LHC data, clarifies the impact of on-shell graviton exchange, and compares full amplitude calculations to experimental results.
Findings
Lower bounds on the quantum gravity scale: 2.1 TeV (ATLAS), 3.4 TeV (CMS)
Demonstrates the significance of on-shell graviton exchange in collider bounds
Provides a detailed comparison between full graviton amplitude and experimental data.
Abstract
We derive new dominant bounds on the coefficient of the effective operator generated by tree-level graviton exchange in large extra dimensions from pp \rightarrow jj data at LHC: M_T > 2.1TeV (ATLAS after 3.1/pb of integrated luminosity), M_T > 3.4 TeV (CMS after 36/pb), MT > 3.2 TeV (ATLAS after 36/pb). We clarify the role of on-shell graviton exchange and compare the full graviton amplitude to ATLAS data, setting bounds on the fundamental quantum-gravity scale.
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