Journal
PHYSICAL REVIEW D
Volume 81, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.81.085037
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Funding
- European Programme [PITN-GA-2009-237920]
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We derive model-independent, universal upper bounds on the operator product expansion coefficients in unitary 4-dimensional conformal field theories. The method uses the conformal block decomposition and the crossing symmetry constraint of the 4-point function. In particular, the operator product expansion coefficient of three identical dimension d scalar primaries is found to be bounded by similar or equal to 10(d - 1) for 1 < d < 1.7. This puts strong limits on unparticle self-interaction cross sections at the LHC.
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