The POWHEG BOX             
              

Project

The POWHEG BOX is a general computer framework for implementing NLO calculations in shower Monte Carlo programs according to the POWHEG method. It is also a library, where previously included processes are made available to the users. It can be interfaced with all modern shower Monte Carlo programs that support the Les Houches Interface for User Generated Processes.


Available Processes

  • Single vector-boson production with decay, S. Alioli, P. Nason, C. Oleari and E. Re, JHEP 0807 (2008) 060, arXiv:0805.4802 [paper]
       POWHEG-BOX/W
       POWHEG-BOX/Z
  • Vector boson plus one jet production with decay, S. Alioli, P. Nason, C. Oleari and E. Re, JHEP 1101 (2011) 095, arXiv:1009.5594 [paper]
        POWHEG-BOX/Zj
        POWHEG-BOX/Wj
  • Single-top production in the s- and t-channel, S. Alioli, P. Nason, C. Oleari and E. Re, JHEP 0909 (2009) 111, arXiv:0907.4076 [paper]
        POWHEG-BOX/ST_sch
        POWHEG-BOX/ST_tch
  • Single-top production associated with a W boson, E. Re, Eur. Phys. J. C71 (2011) 1547, arXiv:1009.2450 [paper]
        POWHEG-BOX/ST_wtch_DR
        POWHEG-BOX/ST_wtch_DS
  • Higgs boson production in gluon fusion, S. Alioli, P. Nason, C. Oleari and E. Re, JHEP 0904 (2009) 002, arXiv:0812.0578 [paper]
        POWHEG-BOX/gg_H
  • Higgs boson production in vector boson fusion, P. Nason and C. Oleari, JHEP 1002 (2010) 037, arXiv:0911.5299 [paper] 
  • From rev. 2940, the code is under the V2 version. Only this version will be maintened
        POWHEG-BOX/VBF_H
        User-Processes-V2/VBF_H
  • Jet pair production , S. Alioli, K. Hamilton, P. Nason, C. Oleari and E. Re, JHEP 1104 (2011) 081, arXiv:1012.3380 [paper] ;  see also note on dijet upgrade 
        POWHEG-BOX/Dijet
        POWHEG-BOX/dijet (under ver 2)
  • Heavy-quark pair production, S. Frixione, P. Nason and G. Ridolfi, JHEP 0709 (2007) 126, arXiv:0707.3088 [paper]
        POWHEG-BOX/hvq
  • W+ W+ plus dijet production, T. Melia, P. Nason, R. Rontsch, G. Zanderighi, Eur. Phys. J. C71 (2011) 1670, arXiv:1102.4846 [paper]
        POWHEG-BOX/Wp_Wp_J_J
  • NLO corrections merged with parton showers for Z+2 jets production using the POWHEG method, E. Re, arXiv:1204.5433, [paper]
        POWHEG-BOX/Zjj
        (Needs to be linked with an external program to compute virtual corrections. Detailed instructions are in the manual)
  • ZZ, WZ and W+W- production, including Gamma/Z interference, singly resonant contributions and interference for identical leptons, T. Melia, P. Nason, R. Rontsch, G. Zanderighi, JHEP 1111 (2011) 078, arXiv:1107.5051 [paper]

  • POWHEG-BOX/WW
    POWHEG-BOX/WZ
    POWHEG-BOX/ZZ

    For the same processes in POWHEG-BOX-V2 quote also:
    W+W− , WZ and ZZ production in the POWHEG-BOX-V2, P. Nason and G. Zanderighi, Eur.Phys.J. C74 (2014) 2702, arXiv:1311.1365 [paper]
  • W b bbar production, C. Oleari and L. Reina, JHEP 1108 (2011) 061, arXiv:1105.4488 [paper]. Available also under version 2

  • POWHEG-BOX/Wbb
    User-Processes-V2/Wbb_nodec
  • NLO corrections to electroweak and QCD production of W+W+ plus two jets, B. Jäger and G. Zanderighi, JHEP 1111 (2011) 055, arXiv:1108.0864 [paper]
        POWHEG-BOX/VBF_Wp_Wp
  • Higgs boson production in gluon fusion with quark mass and EW effects, E. Bagnaschi, G. Degrassi, P. Slavich, A. Vicini, arXiv:1111.2854 [paper]
        POWHEG-BOX/gg_H_quark-mass-effects
  • Scalar and Pseudoscalar Higgs production in gluon fusion in the MSSM, E. Bagnaschi, G. Degrassi, P. Slavich, A. Vicini, arXiv:1111.2854 [paper]
        POWHEG-BOX/gg_H_MSSM
  • Scalar and Pseudoscalar Higgs production in gluon fusion in 2HDM, E. Bagnaschi, G. Degrassi, P. Slavich, A. Vicini,
        POWHEG-BOX/gg_H_2HDM
  • Combining NLO QCD and electroweak radiative corrections to W-boson production at hadron colliders in the POWHEG framework, C. Bernaciak and D. Wackeroth, arXiv:1201.4804 [paper]

  • POWHEG-BOX/W_ew_BW
  • Electroweak corrections in single W production, L. Barzé, G. Montagna, P. Nason, O. Nicrosini, F. Piccinini, arXiv:1202.0465 [paper]

  • POWHEG-BOX/W_ew_BMNNP
  • NLO Higgs boson production plus one and two jets using the POWHEG BOX, MadGraph4 and MCFM, J.M. Campbell, R.K. Ellis, R. Frederix, P. Nason, C. Oleari, C. Williams, JHEP 1207 (2012) 092, arXiv:1202.5475 [paper] From rev. 2942, code in version 2.

  • POWHEG-BOX/HJ
    POWHEG-BOX/HJJ
    User-Processes-V2/HJJ
  • Associated production of charged Higgs bosons and top quarks with POWHEG, M. Klasen, K. Kovarik, P. Nason, C. Weydert, arXiv:1203.1341 [paper]

  • NOT YET ADDED to the POWHEG BOX repository. Please contact the authors.
  • Next-to-leading order QCD corrections to electroweak Zjj production in the POWHEG BOX, B. Jäger, S. Schneider, G. Zanderighi, arXiv:1207.2626 [paper]

  • POWHEG-BOX/VBF_Z
  • Single-top t-channel hadroproduction in the four-flavour scheme with POWHEG and aMC@NLO, R. Frederix, E. Re, P. Torrielli, arXiv:1207.5391 [paper]
  • From rev. 2954, it is under the V2 version. Only this version will be maintened.

    POWHEG-BOX/ST_tch_4f
    User-Processes-V2/ST_tch_4f
  • Slepton pair production in the POWHEG BOX, B. Jäger, A. von Manteuffel, S. Thier, arXiv:1208.2953 [paper]

  • POWHEG-BOX/dislepton
  • Electroweak W+W- j j production, B. Jäger, and G. Zanderighi, arXiv:1301.1695 [paper]

  • POWHEG-BOX/VBF_Wp_Wm
  • Neutral current Drell-Yan with combined QCD and electroweak corrections in the POWHEG BOX, L. Barzè, G. Montagna, P. Nason, O. Nicrosini, F. Piccinini, A. Vicini, arXiv:1302.4606 [paper]

  • POWHEG-BOX/Z_ew_BMNNPV
  • Parton shower effects on W and Z production via vector boson fusion at NLO QCD, F. Schissler, D. Zeppenfeld, arXiv:1302.2884 [paper]

  • POWHEG-BOX/VBF_W-Z
  • W and Z bosons in association with two jets using the POWHEG method, J.M. Campbell, R.K. Ellis, P. Nason and G. Zanderighi, arXiv:1303.5447 [paper]

  • POWHEG-BOX/W2jet
    POWHEG-BOX/Z2jet
  • Hadronic top-quark pair-production with one jet and parton showering, S. Alioli, S.O. Moch and P. Uwer, JHEP 1201 (2012) 137, arXiv:1110.5251 [paper]

  • POWHEG-BOX/ttJ
  • HW/HZ + 0 and 1 jet at NLO with the POWHEG BOX interfaced to GoSam and their merging within MiNLO, G. Luisoni, P. Nason, C. Oleari, F. Tramontano, JHEP 1310 (2013) 083, arXiv:1306.2542 [paper]. From rev. 2940, virtual contributions in HVJ are computed analytically. Exact top- and bottom-quark mass effects are included in the virtual diagrams. Hadronic and inclusive decays added. Code in version 2.

  • User-Processes-V2/HW
    User-Processes-V2/HZ
    User-Processes-V2/HWJ
    User-Processes-V2/HZJ
  • gg → HZ at LO, G. Luisoni, C. Oleari, F. Tramontano. Exact top- and bottom-quark mass effects included.Code in version 2.

  • User-Processes-V2/ggHZ
  • Dark-Matter + Monojet with POWHEG, U. Haisch, F, Kahlhoefer, E. Re, arXiv:1310.4491 [paper]. Code in version 2.

  • User-Processes-V2/DMV
    User-Processes-V2/DMGG
    User-Processes-V2/DMS
  • Scalar and pseudoscalar monojet production, exact top-quark mass effects included (at LO). U. Haisch, E. Re, arXiv:1503.00691 [paper]. Code in version 2.

  • User-Processes-V2/DMS_tloop
  • W+W-, WZ and ZZ production in the POWHEG BOX V2, P. Nason and G. Zanderighi, arXiv:1311.1365 [paper]. Code in version 2.

  • User-Processes-V2/ZZ
    User-Processes-V2/WZ
    User-Processes-V2/WW
  • Electroweak ZZjj production in the Standard Model and beyond in thePOWHEG-BOX V2, Barbara Jager, Alexander Karlberg and Giulia Zanderighi, arXiv:1312.3252 [paper]. Code in version 2.

  • User-Processes-V2/VBF_Z_Z
  • Three-jet production in POWHEG, Adam Kardos, Paolo Nason and Carlo Oleari, arXiv:1402.4001 [paper]. Code in version 2.

  • User-Processes-V2/trijet
  • VBF Higgs boson production + 3 jets, B. Jager, F. Schissler, D. Zeppenfeld, arXiv:1405.6950 [paper]. Code in version 2.

  • User-Processes-V2/VBF_HJJJ
  • Squark production and decay, R. Gavin, C. Hangst, M. Krämer, M. Mühlleitner, M. Pellen, E. Popenda, M. Spira, arXiv:1305.4061 [paper] and arXiv:1407.7971 [paper]. Code in version 2.

  • User-Processes-V2/disquark
  • Wγ production in hadronic collisions using the POWHEG+MiNLO method, L. Barzé, M. Chiesa, G. Montagna, P. Nason, O. Nicrosini, F. Piccinini and V. Prosperi, JHEP 1412 (2014) 039, arXiv:1408.5766 [paper] Code in version 2.

  • User-Processes-V2/Wgamma
  • Slepton pair production in association with a jet, B. Jäger, A. von Manteuffel, S. Thier, arXiv:1410.3802 [paper]. Code in version 2.

  • User-Processes-V2/dislepton-jet
  • Higgs boson production in association with top quarks in the POWHEG BOX, H. B. Hartanto, B. Jäger, L. Reina, D. Wackeroth, arXiv:1501.04498 [paper]. Code in version 2.

  • User-Processes-V2/ttH
  • Higgs boson production in association with bottom quarks in the POWHEG BOX, B. Jäger, L. Reina, D. Wackeroth, arXiv:1509.05843 [paper]. Code in version 2.

  • User-Processes-V2/bbH
  • Wbbj and Wbb production with W → l vu, G. Luisoni, C. Oleari, F. Tramontano, arXiv:1502.01213 [paper]. Code in version 2.

  • User-Processes-V2/Wbbj
    User-Processes-V2/Wbb_dec
  • t tbar production and decays, with NLO correction to the decays also treated, and off-shell effects treated at leading order, J.M. Campbell, R.K. Ellis, P. Nason and E. Re, arXiv:1412.1828 [paper]. Code in version 2.

  • User-Processes-V2/ttb_NLO_dec


In addition to the specific subprocess reference, the following papers should always be cited while using the POWHEG BOX:
  • P. Nason, JHEP 0411 (2004) 040, hep-ph/0409146 [paper]
  • S. Frixione, P. Nason and C. Oleari, JHEP 0711 (2007) 070, arXiv:0709.2092 [paper]
  • S. Alioli, P. Nason, C. Oleari and E. Re, JHEP 1006 (2010) 043, arXiv:1002.2581 [paper]

Download

The POWHEG BOX is made available only via SVN, with the command:

$ svn checkout [--revision n] --username anonymous --password anonymous svn://powhegbox.mib.infn.it/trunk/POWHEG-BOX

The optional argument --revision n is used to specify which svn version to get. Omitting the argument, one gets the latest version.

Since revision 2801, the POWHEG BOX files, without user processes, have been mirrored in svn://powhegbox.mib.infn.it/trunk/POWHEG-BOX-NoUserProcesses. Further fixes to this version will only be made in this directory. Thus, users should first download

$ svn checkout svn://powhegbox.mib.infn.it/trunk/POWHEG-BOX-NoUserProcesses POWHEG-BOX

then do

$ cd POWHEG-BOX
$ svn checkout svn://powhegbox.mib.infn.it/trunk/POWHEG-BOX/"process-of-interest"

This is to avoid having to download all user processes when we are only interested into one.



VERSION 2

The POWHEG BOX V2 (Version 2) is now ready. New processes will only be implemented in V2. Older processes will be ported on V2 upon request to the respective authors.
To get the V2 version do
$ svn checkout [--revision n] --username anonymous --password anonymous svn://powhegbox.mib.infn.it/trunk/POWHEG-BOX-V2

User processes should be downloaded independently. This is to avoid long downloads from the svn server. They are in the subdirectories in svn://powhegbox.mib.infn.it/trunk/User-Processes-V2.
Do:
$ svn list [--revision n] --username anonymous --password anonymous svn://powhegbox.mib.infn.it/trunk/User-Processes-V2
to get a list of available processes.

Do:
$ svn co [--revision n] --username anonymous --password anonymous svn://powhegbox.mib.infn.it/trunk/User-Processes-V2/XXX
to download process XXX. In order to compile XXX you should put it in the POWHEG-BOX-V2 directory.


Bug
A list of found bugs in the V1 (trunk/POWHEG-BOX) version can be found here. Bugs are corrected immediately in the trunk version, that can be considered the most up-to-date version of the POWHEG BOX.



Bug
A list of found bugs in the V2 (trunk/POWHEG-BOX-V2) version can be found here. Bugs are corrected immediately in the V2 version, that can be considered the most up-to-date version of the POWHEG BOX V2.






The previous trunk (before 29 March 2011) is made available at

$ svn checkout [--revision n] --username anonymous --password anonymous svn://powhegbox.mib.infn.it/tags/trunk00/POWHEG-BOX

The POWHEG BOX is distributed under the following license, according to the MCNet Guidelines for Event Generators Authors and Users.



Previous implementations can be found in the old web page.


Related useful software (pdfs, jet analysis, showering...): LHAPDF   FastJet   HERWIG  PYTHIA.


Contributing Authors

Up to now, the following people have contributed to the POWHEG BOX:
Simone Alioli, Keith Hamilton, Paolo Nason, Carlo Oleari, Emanuele Re, Giulia Zanderighi.