Color-singlet production at NNLO in MCFM

Radja Boughezal; John M. Campbell; R. Keith Ellis; Christfried Focke; Walter Giele; Xiaohui Liu; Frank Petriello; Ciaran Williams

doi:10.1140/epjc/s10052-016-4558-y

EPJ

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2023 Impact factor 4.2

Particles and Fields

Open Access

Eur. Phys. J. C (2017) 77: 7
https://doi.org/10.1140/epjc/s10052-016-4558-y

Regular Article - Theoretical Physics

Color-singlet production at NNLO in MCFM

Radja Boughezal¹, John M. Campbell², R. Keith Ellis³, Christfried Focke⁴^*, Walter Giele², Xiaohui Liu⁵, Frank Petriello¹^,4 and Ciaran Williams⁶

¹ High Energy Physics Division, Argonne National Laboratory, Argonne, IL, 60439, USA
² Fermilab, P.O.Box 500, Batavia, IL, 60510, USA
³ Department of Physics, Institute for Particle Physics Phenomenology, University of Durham, Durham, DH1 3LE, UK
⁴ Department of Physics and Astronomy, Northwestern University, Evanston, IL, 60208, USA
⁵ Maryland Center for Fundamental Physics, University of Maryland, College Park, Maryland, 20742, USA
⁶ Department of Physics, University at Buffalo, The State University of New York, Buffalo, 14260, USA

^* e-mail: christfried.focke@northwestern.edu

Received: 14 July 2016
Accepted: 7 December 2016
Published online: 30 December 2016

Abstract

We present the implementation of several color-singlet final-state processes at Next-to-Next-to Leading Order (NNLO) accuracy in QCD to the publicly available parton-level Monte Carlo program MCFM. Specifically we discuss the processes $pp\rightarrow H$ , $pp\rightarrow Z$ , $pp\rightarrow W$ , $pp\rightarrow HZ$ , $pp\rightarrow HW$ and $pp\rightarrow \gamma \gamma$ . Decays of the unstable bosons are fully included, resulting in a flexible fully differential Monte Carlo code. The NNLO corrections have been calculated using the non-local N-jettiness subtraction approach. Special attention is given to the numerical aspects of running MCFM for these processes at this order. We pay particular attention to the systematic uncertainties due to the power corrections induced by the N-jettiness regularization scheme and the evaluation time needed to run the hybrid openMP/MPI version of MCFM at NNLO on multi-processor systems.