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Z-Boson Production in Association with a Jet at Next-To-Next-To-Leading Order in Perturbative QCD (2016)
Journal Article
Boughezal, R., Campbell, J., Ellis, R., Focke, C., Giele, W., Liu, X., & Petriello, F. (2016). Z-Boson Production in Association with a Jet at Next-To-Next-To-Leading Order in Perturbative QCD. Physical Review Letters, 116(15), Article 152001. https://doi.org/10.1103/physrevlett.116.152001

We present the first complete calculation of Z-boson production in association with a jet in hadronic collisions through next-to-next-to-leading order in perturbative QCD. Our computation uses the recently proposed N-jettiness subtraction scheme to r... Read More about Z-Boson Production in Association with a Jet at Next-To-Next-To-Leading Order in Perturbative QCD.

A multi-threaded version of MCFM (2015)
Journal Article
Campbell, J. M., Ellis, R. K., & Giele, W. T. (2015). A multi-threaded version of MCFM. The European Physical Journal C, 75(6), Article 246. https://doi.org/10.1140/epjc/s10052-015-3461-2

We report on our findings modifying MCFM using OpenMP to implement multi-threading. By using OpenMP, the modified MCFM will execute on any processor, automatically adjusting to the number of available threads. We modified the integration routine VEGA... Read More about A multi-threaded version of MCFM.

Top-pair production and decay at NLO matched with parton showers (2015)
Journal Article
Campbell, J. M., Ellis, R. K., Nason, P., & Re, E. (2015). Top-pair production and decay at NLO matched with parton showers. Journal of High Energy Physics, 2015(04), Article 114. https://doi.org/10.1007/jhep04%282015%29114

We present a next-to-leading order (NLO) calculation of tt¯ production in hadronic collisions interfaced to shower generators according to the POWHEG method. We start from an NLO result from previous work, obtained in the zero width limit, where radi... Read More about Top-pair production and decay at NLO matched with parton showers.

Higgs constraints from vector boson fusion and scattering (2015)
Journal Article
Campbell, J. M., & Ellis, R. K. (2015). Higgs constraints from vector boson fusion and scattering. Journal of High Energy Physics, 2015(04), Article 030. https://doi.org/10.1007/jhep04%282015%29030

We present results on 4-lepton + 2-jet production, the partonic processes most commonly described as vector boson pair production in the Vector Boson Fusion (VBF) mode. This final state contains diagrams that are mediated by Higgs boson exchange. We... Read More about Higgs constraints from vector boson fusion and scattering.

Top-quark processes at NLO in production and decay (2014)
Journal Article
Campbell, J. M., & Ellis, R. K. (2014). Top-quark processes at NLO in production and decay. Journal of Physics G: Nuclear and Particle Physics, 42(1), Article 015005. https://doi.org/10.1088/0954-3899/42/1/015005

We describe the implementation of top production and decay processes in the parton-level Monte Carlo program MCFM. By treating the top quark as being on-shell, we can factorize the amplitudes for top-pair production, s-channel single-top production,... Read More about Top-quark processes at NLO in production and decay.

Interference effects for Higgs boson mediatedZ-pair plus jet production (2014)
Journal Article
Campbell, J. M., Ellis, R. K., Furlan, E., & Röntsch, R. (2014). Interference effects for Higgs boson mediatedZ-pair plus jet production. Physical Review D, 90(9), Article 093008. https://doi.org/10.1103/physrevd.90.093008

We study interference effects in the production channel Z Z + jet , in particular focusing on the role of the Higgs boson. This production channel receives contributions both from Higgs boson mediated diagrams via the decay H → Z Z (signal diagrams),... Read More about Interference effects for Higgs boson mediatedZ-pair plus jet production.

Bounding the Higgs width at the LHC using full analytic results for gg−>e−e+μ−μ+ (2014)
Journal Article
Campbell, J. M., Ellis, R. K., & Williams, C. (2014). Bounding the Higgs width at the LHC using full analytic results for gg−>e−e+μ−μ+. Journal of High Energy Physics, 2014(04), Article 060. https://doi.org/10.1007/jhep04%282014%29060

We revisit the hadronic production of the four-lepton final state, e − e + μ − μ + , through the fusion of initial state gluons. This process is mediated by loops of quarks and we provide first full analytic results for helicity amplitudes that accou... Read More about Bounding the Higgs width at the LHC using full analytic results for gg−>e−e+μ−μ+.