Gionata Luisoni [email protected]Max Planck Institute for Physics Munich NLO calculations with GoSam In collaboration with: G.Cullen, N. Greiner, G.Heinrich, P.Mastrolia, E.Mirabella, G.Ossola, F. Tramontano H. Van Deurzen, T.Peraro, J. Reichel , J. Schlenk, J.F.G. von Soden-Fraunhofen GoSam release: arXiv:1111.2034 [hep-ph] | http://gosam.hepforge.org/ Rencontres de Moriond 2013, La Thuile 11.03.2013
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All codes in gosam-contrib package Yellow codes distributed separately
BLHA-interface
G.Luisoni, 11th March 2013
GoSam with external MC • GoSam + MadGraph4 + MadDipole + MadEvent
• Interfaced via add-hoc interface • Succesfully used to compute:
◦ W+W- + 2 jets ◦ bbbb production ◦ X0
1 + X01 + 1 jet
◦ γ + γ + 1 jet
• GoSam + POWHEG • Development phase completed • Finalizing test phase
• GoSam + SHERPA • Possible since Sherpa 1.4.0 (March 2012) : [--enable-lhole] • Little additional patch needed for parameter communication • Packages publicly available at: http://gosam.hepforge.org/proc/ • Succesfully used to compute
[Greiner, Heinrich, Reichel, von Soden-Fraunhofen in preparation]
[Gehrmann, Greiner, Heinrich 13]
GoSam+Sherpa Process Packages
G.Luisoni, 11th March 2013
• Single process packages with pre-generated virtual code for the calculation of NLO QCD corrections to selected LHC processes.
• Available online for the current stable version of Sherpa-1.4.X. (version for Sherpa-2.0.X in preparation)
Available on:
• Completely stand-alone • No need to install further code other than Sherpa
• Only 3 steps for NLO: • Download / un-tar package / run ‘makecode‘ script • Script for plots is also attached • Packages come with example Run card for LO/NLO/NLO+Rivet
Towards Higgs+3jets @ NLO • Transverse momentum distributions for Born + Virtual + Integrated dipoles
G.Luisoni, 11th March 2013
PRELIMINARY
Conclusions & Outlook • Successful use of GoSam interfaced with:
for the computation of NLO corrections for a number of different processes. • Packages available online: • Computation of H+2 jets in gluon-gluon fusion • First preliminary results for H+3 jets in gluon-gluon fusion
• Outlook: • Use available packages for phenomenology • Preparation and optimization of packages for further processes • Phenomenology studies in H+jets with available codes • Code improvements to make computation faster and codes “lighter“