Precision Probes of QCD at High Energies

Abstract

New physics, that is too heavy to be produced directly, can leave measurable imprints on the tails of kinematic distributions at the LHC. We use energetic QCD processes to perform novel measurements of the Standard Model (SM) Effective Field Theory. We show that the dijet invariant mass spectrum, and the inclusive jet transverse momentum spectrum, are sensitive to a dimension 6 operator that modifies the gluon propagator at high energies. The dominant effect is constructive or destructive interference with SM jet production. We compare differential next-to-leading order predictions from POWHEG to public 7 TeV jet data, including scale, PDF, and experimental uncertainties and their respective correlations. We constrain a New Physics (NP) scale of 3.5 TeV with current data. We project the reach of future 13 and 100 TeV measurements, which we estimate to be sensitive to NP scales of 8 and 60 TeV, respectively. As an application, we apply our bounds to constrain heavy vector octet colorons that couple to the QCD current. We project that effective operators will surpass bump hunts, in terms of coloron mass reach, even for sequential couplings.

40 pages, 13 figures, 8 tables. Minor changes. Accepted on JHEP

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• LHC tau-pair production constraints on $a_{\tau }$ and $d_{\tau }$
• Unitarity Bounds on Effective Field Theories at the LHC
• Machine learning of log-likelihood functions in global analysis of parton distributions
• Impact of unidentified light charged hadron data on the determination of pion fragmentation functions
• Exploring the Flavor Symmetry Landscape
• A tale of $Z$+jet: SMEFT effects and the Lam-Tung relation
• Collider constraints and new tests of color octet vectors
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