Search for Excited Quarks in $q\bar{q} \to γγ$ at the LHC

Details Search for Excited Quarks in $q\bar{q} \to γγ$ at the LHC Search for Excited Quarks in $q\bar{q} \to γγ$ at the LHC

2007-05-23

arxiv.org/abs/0705.3472v2

Phys.Rev.D76:115017,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, 11 figures

Scientific paper

10.1103/PhysRevD.76.115017

If quarks are composite particles, then excited states are expected to play a r\^ole in the Large Hadron Collider phenomena. Concentrating on virtual effects, and using a large part of the CMS detection criteria, we present here a realistic examination of their effect in diphoton production at the LHC. For various luminosities, we present the 99 % confidence limit (CL) achievable in $\Lambda-M_{q*}$ parameter space where $\Lambda$ is the compositeness scale and M_{q^*} the mass of the state. For a q^* of mass 0.5 TeV, $\Lambda \leq 1.55 (2.95)$ can be excluded at 99% CL with 30 (200)${\rm fb}^{-1}$ integrated luminosity.

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