Automated calculation of Jet fragmentation at NLO in QCD

Abstract

We present FMNLO, a framework to combine general-purpose Monte Carlo generators and fragmentation functions (FFs). It is based on a hybrid scheme of phase-space slicing method and local subtraction method, and accurate to next-to-leading order (NLO) in QCD. The new framework has been interfaced to MG5 aMC@NLO and made publicly available in this work. We demonstrate its unique ability by giving theoretical predictions of various fragmentation measurements at the LHC, followed by comparison with the data. With the help of interpolation techniques, FMNLO allows for fast calculation of fragmentation processes for a large number of different FFs, which makes it a promising tool for future fits of FFs. As an example, we perform a NLO fit of parton fragmentation functions to unidentified charged hadrons using measurements at the LHC. We find the ATLAS data from inclusive dijet production show a strong constraining power. Notable disparities are found between our gluon FF and that of BKK, DSS and NNFF, indicating the necessities of additional constraints and data for gluon fragmentation function.

35 pages, 15 figures, 3 tables; comments are welcome

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Cited by in corpus (7)

• Global analysis of fragmentation functions to charged hadrons with high-precision data from the LHC
• Simultaneous Determination of Fragmentation Functions and Test on Momentum Sum Rule
• Fragmentation Functions of Charged Hadrons at Next-to-Next-to-Leading Order and Constraints on the Proton Parton Distribution Functions
• Global analysis of fragmentation functions to light neutral hadrons
• Polarized fragmenting jet functions in Inclusive and Exclusive Jet Production
• Identified Hadron Production at Hadron Colliders in Next-to-Next-to-Leading-Order QCD
• Dihadron Angular Correlations in the $e^{+}{e}^{-}$ Collision