NLO+NLL squark and gluino production cross sections with threshold-improved parton distributions

The European Physical Journal C

Simone Marzani¹  Eric Laenen²  Michael Krämer³  Anna Kulesza⁴  Christoph Borschensky⁴  Juan Rojo⁵  Wim Beenakker⁶ 

[1] Department of Physics, University at Buffalo, The State University of New York, 14260-1500, Buffalo, NY, USA;ITFA, University of Amsterdam, Science Park 904, 1018 XE, Amsterdam, The Netherlands;ITF, Utrecht University, Leuvenlaan 4, 3584 CE, Utrecht, The Netherlands;Nikhef Theory Group, Science Park 105, 1098 XG, Amsterdam, The Netherlands;Institute for Theoretical Particle Physics and Cosmology, RWTH Aachen University, 52056, Aachen, Germany;Institute for Theoretical Physics, WWU Münster, 48149, Münster, Germany;Rudolf Peierls Centre for Theoretical Physics, University of Oxford, 1 Keble Road, OX1 3NP, Oxford, UK;Theoretical High Energy Physics, IMAPP, Faculty of Science, Radboud University Nijmegen, P.O. Box 9010, Mailbox 79, 6500 GL, Nijmegen, The Netherlands;Institute of Physics, University of Amsterdam, Amsterdam, The Netherlands;

关键词: Pair Production;    Partonic Cross Section;    Sparticle Mass;    Threshold Resummation;    Gluino Pair Production;   

DOI  :  10.1140/epjc/s10052-016-3892-4

来源: Springer

【 摘 要 】

We present updated predictions for the cross sections for pair production of squarks and gluinos at the LHC Run II. First of all, we update the calculations based on NLO+NLL partonic cross sections by using the NNPDF3.0NLO global analysis. This study includes a full characterization of theoretical uncertainties from higher orders, PDFs and the strong coupling. Then we explore the implications for this calculation of the recent NNPDF3.0 PDFs with NLO+NLL threshold resummation. We find that the shift in the results induced by the threshold-improved PDFs is within the total theory uncertainty band of the calculation based on NLO PDFs. However, we also observe that the central values of the NLO+NLL cross sections are modified both in a qualitative and a quantitative way, illustrating the relevance and impact of using threshold-improved PDFs together with resummed partonic cross sections. The updated NLO+NLL cross sections based on NNPDF3.0NLO are publicly available in the NLL-fast format, and should be an important ingredient for the interpretation of the searches for supersymmetric particles at Run II.

【 授权许可】

CC BY