LHC bounds on large extra dimensions

Franceschini, Roberto; Giardino, Pier Paolo; Lodone, Paolo; Strumia, Alessandro; Giudice, Gian F.

doi:10.1007/JHEP05(2011)092

Article
Report number	arXiv:1101.4919 ; IFUP-TH-2010-43 ; CERN-PH-TH-2010-286
Title	LHC bounds on large extra dimensions
Author(s)	Franceschini, Roberto (LPHE, Lausanne) ; Giardino, Pier Paolo (Pisa U. ; INFN, Pisa) ; Giudice, Gian F. (CERN) ; Lodone, Paolo (Pisa, Scuola Normale Superiore ; INFN, Pisa) ; Strumia, Alessandro (Pisa U. ; INFN, Pisa ; NICPB, Tallinn)
Publication	2011
Imprint	26 Jan 2011
Number of pages	16
Note	Comments: 16 pages, 6 figures 16 pages, 6 figures. v2: updated with CMS data. v3: updated with ATLAS data at 36/pb/ final published version
In:	JHEP 05 (2011) 092
DOI	10.1007/JHEP05(2011)092
Subject category	Particle Physics - Phenomenology
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.
Copyright/License	Open Access Preprint: © 2010-2025 CERN (License: CC-BY-3.0)

$\em Fig.~\ref{fig:treeloop}{\rm a}: Tree-level graviton exchange generating the dimension-8 operator $\cal T$. Fig.~\ref{fig:treeloop}{\rm b}: One-loop graviton exchange generating the dimension-6 operator $\Upsilon$.$ $\bf Tree-level graviton exchange}: \em {95\% CL limits on the coefficient $M_{T}$ (known as Hewett normalization~\cite{hewett}) of the dimension-8 operator $\cal T$ of eq.\eq{tau} for positive and negative interference. The last two limits are derived in this work. \bf Loop-level graviton exchange}: \em { 95\% CL limits on the coefficient $|c_\Upsilon/4\pi|^{-1/2}$ (in {\rm TeV}) of the dimension-6 operator $\Upsilon$ of eq.\eq{Upsilon} for positive and negative values of $c_\Upsilon$.$ $\em Left (right): $pp\to jj$ angular distribution at ATLAS with $M_{jj}>1.2\TeV$ (at CMS with $M_{jj}>2.2\TeV$) binned as a function of the angular distance $\chi$. The experimental data (crosses) are compared to the SM prediction (black histogram) and to the expectation including virtual graviton effects at tree level.$ Show more plots

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