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Ntuples for NLO events at hadron colliders

Bern, Z.; Dixon, L.J.; Febres Cordero, F.; Höche, S.; Ita, H.; Kosower, D.A.; Maître, D.

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Z. Bern

L.J. Dixon

F. Febres Cordero

S. Höche

H. Ita

D.A. Kosower


We present an event-file format for the dissemination of next-to-leading-order (NLO) predictions for QCD processes at hadron colliders. The files contain all information required to compute generic jet-based infrared-safe observables at fixed order (without showering or hadronization), and to recompute observables with different factorization and renormalization scales. The files also make it possible to evaluate cross sections and distributions with different parton distribution functions. This in turn makes it possible to estimate uncertainties in NLO predictions of a wide variety of observables without recomputing the short-distance matrix elements. The event files allow a user to choose among a wide range of commonly-used jet algorithms and jet-size parameters. We provide event files for a W or Z boson accompanied by up to four jets, and for pure-jet events with up to four jets. The files are for the Large Hadron Collider with a center of mass energy of 7 or 8 TeV. A C++ library along with a Python interface for handling these files is also provided and described in this article. The library allows a user to read the event files and recompute observables transparently for different pdf sets and factorization and renormalization scales.


Bern, Z., Dixon, L., Febres Cordero, F., Höche, S., Ita, H., Kosower, D., & Maître, D. (2014). Ntuples for NLO events at hadron colliders. Computer Physics Communications, 185(5), 1443-1460.

Journal Article Type Article
Acceptance Date Jan 16, 2014
Online Publication Date Jan 28, 2014
Publication Date 2014-05
Deposit Date Feb 18, 2014
Publicly Available Date Nov 1, 2021
Journal Computer Physics Communications
Print ISSN 0010-4655
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 185
Issue 5
Pages 1443-1460


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