Predictions for the Isolated Diphoton Production through NNLO in QCD and Comparison to the 8 TeV ATLAS Data

Bouzid Boussaha,Lahouari Semlala,F Iddir

doi:10.1155/2018/4174602

Bouzid Boussaha, Lahouari Semlala + Show 1 more

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https://doi.org/10.1155/2018/4174602

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Abstract

We present cross-section predictions for the isolated diphoton production in next-to-next-to-leading order (NNLO) QCD using the computational framework MATRIX. Both the integrated and the differential fiducial cross-sections are calculated. We found that the arbitrary setup of the isolation procedure introduces uncertainties with a size comparable to the estimation of the theoretical uncertainties obtained with the customary variation of the factorization and renormalization scales. This fact is taken into account in the final result.

Highlights

Considerable attention, both experimental and theoretical, has been paid to the study of the diphoton productions
The complete NLO oneand two-fragmentation contributions are implemented in DIPHOX
We can lift the following points from this study: (i) The next-to-next-to-leading order (NNLO) cross-sections are more sensitive to the variation of the parameters of isolation in comparison with the NLO results

Summary

Introduction

Considerable attention, both experimental and theoretical, has been paid to the study of the diphoton productions. This is far from the Les Houches accord 2013 recommendations which state that to match experimental conditions to theoretical calculations with reasonable accuracy, the isolation parameters must be tight enough: EmT ax ≤ 5 GeV or ε < 0.1 (assuming n = 1) [17].

Results

Conclusion