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Closure testing the NNPDF3.0 methodology

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arxiv 1409.4283 v1 pith:IUPKVJT6 submitted 2014-09-15 hep-ph

Closure testing the NNPDF3.0 methodology

classification hep-ph
keywords closuremethodologydeterminationnnpdf3resultstestsapplyingbeen
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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A thorough understanding of the issues surrounding the determination of parton distributions is crucial due to their importance to calculations of LHC observables. However, it is still not fully understood how much of an impact methodological bias has on PDF fits. Closure tests, where a fit is performed to pseudo-data generated using an existing PDF set, provide a way of directly investigating whether current PDF fitting methodologies are successful. Here, we present a sample of results from closure tests applying the NNPDF methodology to data created using a variety of different PDF sets. The results validate our methodology by showing that the initial PDFs can be reproduced within uncertainties. We also briefly discuss our latest PDF determination, NNPDF3.0, which has been developed making extensive use of the closure test technique.

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