PHOKHARA
    radiative return at flavour factories

Physics

Electron--positron annihilation into hadrons plus an energetic photon from initial state radiation (ISR) allows the hadronic cross-section to be measured over a wide range of energies at high luminosity flavour factories [DAPHNE, CESR, PEP-II, KEK-B, Super-KEKB, BESIII].

Content

PHOKHARA is a Monte Carlo event generator which simulates this process at the next-to-leading order (NLO) accuracy. This includes virtual and soft photon corrections to one photon emission events and the emission of two real hard photons.

Downloads

VERSION 10.0 (October 2020): Includes complete NLO radiative corrections for the extraction of the pion form factor. The new implementation is described in detail in Phys. Rev. D100 (2019) no.7, 076004 [arXiv:1903.10197 hep-ph].

  • manual [PDF], source [.tar.gz]

    The Phokhara 10.0 version of (December 2018), previously distributed, contains two bugs/omissions:

    • For the 2-pion mode the vacuum polarisation corrections were not implemented in the virtual parts with two photons exchanged between the initial and final states.
    • For the 2-muon mode the vacuum polarisation corrections were not implemented correctly in some parts of the code. That bug was there since the release of version 9.0. The numerical size of these bugs/omissions has to be studied case by case basis.
    Results presented in Phys. Rev. D100 (2019) no.7, 076004 [arXiv:1903.10197 hep-ph] are not affected by those omissions.

  •  

    Forthcoming features

  • Further updates are not expected.
  •  

    Previous versions

    VERSION 9.3 (November 2017): New hadronic channels, e+e- → Pγ(γ) with P=π0, η,η', were added. The implemented models are described in details in Phys. Rev. D97 (2018) no.1, 016006 [arXiv:1711.00820 hep-ph]

  • manual [Postscript, PDF], source [.tar.gz]

    VERSION 9.2 (August 2016): Direct, resonant production of χc1 and χc2 in electron-positron annihilation through two virtual photons was added with the subsequent decays χci → J/ψ (→ μ+ μ- )γ.

  • manual [Postscript, PDF], source [.tgz]

    VERSION 9.1 (December 2014): A new model of nucleon form factors was implemented and the FSR corrections to the proton - antiproton final state were added both in the radiative return and scan modes. This version supersedes the version released in August. For details, compare arXiv:1407.7995v2 (it corresponds to the new version) with arXiv:1407.7995v1 (August version). As the model of form factors implemented in the December version is better, the August version will not be supported.

  • manual [Postscript, PDF], source [.tar.gz]

    VERSION 9.0 (February 2014): Includes complete NLO radiative corrections for the muon pair production mode.

  • manual [Postscript, PDF], source [.tar.gz]

    VERSION 8.0 (July 2013):

  • Generates also the mode with no photon emission, including one- and two-loop corrections, as required in scan experiments with inclusive treatement of radiated photons. ISR corrections from one- and two-real photon emission, and one real plus one virtual photon emission as implemented in the previous versions of PHOKHARA are also included. In total this correspond to a NNLO treatement of electron-positron annihilation.
  • The FSR correction to the proton-antiproton final state added in the radiative return mode.
  • New hadronic channel η π+ π-.
  • manual [Postscript, PDF], source [.tgz]

    VERSION 7.0 (July 2010): New modeling of the 4-pion, 2-pion and 2-kaon hadronic currents was implemented and J/ψ and ψ(2S) contributions to 2-pion, 2-kaon, 2-muon final states were introduced.

  • manual [Postscript, PDF], source [.tgz]

    VERSION 6.1 (January 2009): Includes KLOE parametrization for f0+sigma+double vector resonance contributions to FSR for two pions as described in
    O. Shekhovtsova, G. Venanzoni, G. Pancheri, arXiv:0901.4440 [hep-ph]

  • source [.tar.gz]

    VERSION 6.0 (December 2006): Lambda pair production added as new hadronic channel : e+e- → Λ (→ π- p) Λ (→ π+ p ) γ.

  • manual [Postscript, PDF], source [.tar.gz]

    6 Oct 2009: Warning, the program compiled with gfortran, the new GNU Fortran compiler which replaces g77 from version 4 of GCC, does not run correctly even if no errors/warnings are given during compilation and linking. We strongly recommend to use ifort from Intel.

    3 Dec 2007: bug on the two pion channel at line 994 corrected (LO FSR was switched off when vacuum polarization corrections are off). Do not affect previous versions.

    VERSION 5.1 (July 2006): New parameters and functional form of the three-pion form factor.

  • manual [Postscript, PDF], source [.tar.gz]

    VERSION 5.0 (December 2005): Includes three-pion and kaon-pair production as new channels, and radiative phi decay contributions to the reaction e+e- → π+ π- γ, as well as a new pion form factor.

  • manual [Postscript, PDF], source [.tar.gz]

    VERSION 4.0 (April 2004): Incorporates nucleon pair production (proton-antiproton and neutron-antineutron) as new channels. FSR at NLO for muon pair production added, with some improvements in the pion pair channel. Effect of vacuum polarization implemented.

  • manual [Postscript, PDF], source [uuencoded]

    VERSION 3.0 (August 2003): simulates ISR at NLO for two charged pions or muons, and four-pion channels, and FSR at leading order for two charged pions or muons. FSR at NLO for two charged pions added.

  • manual [Postscript, PDF], source [uuencoded]

    VERSION 2.0 (December 2002): includes small angle photon generation, four-pion channels and FSR at leading order for two charged pions or muons.

  • manual [Postscript, PDF], source [uuencoded]

    VERSION 1.0 (December 2001): includes ISR only and is limited to two charged pions or muons together with one or two hard photons as final states.

  • manual [Postscript, PDF], source [uuencoded]

    EVA: simulates two pion events and includes ISR, FSR, and their interference at the leading order (LO), and the dominant radiative corrections from additional collinear radiation through structure function techniques.

  • manual [Postscript, PDF], source [uuencoded]

  • References

  • PHOKHARA 10.0:
    F. Campanario, H. Czyż, J. Gluza, T. Jeliński, G. Rodrigo, S. Tracz and D. Zhuridov
    Phys. Rev. D100 (2019) no.7, 076004 [arXiv:1903.10197 hep-ph].
  • PHOKHARA 9.3:
    H. Czyż, P. Kisza and S. Tracz,
    Phys. Rev. D97 (2018) no.1, 016006 [arXiv:1711.00820 hep-ph].
  • PHOKHARA 9.2:
    H. Czyż, J.H. Kühn and S. Tracz,
    Phys. Rev. D94 (2016) no.3, 034033 [arXiv:1605.06803 hep-ph].
  • PHOKHARA 9.1:
    H. Czyż, J.H. Kühn and S. Tracz,
    Phys. Rev. D90 (2014) no.11, 114021 [arXiv:1407.7995 hep-ph].
  • PHOKHARA 9.0:
    F. Campanario, H. Czyż, J. Gluza, M. Gunia, T. Riemann, G. Rodrigo and V. Yundin,
    JHEP 1402 (2014) 114 [arXiv:1312.3610 hep-ph].
  • PHOKHARA 8.0:
    H. Czyż, M. Gunia, J.H. Kühn,
    JHEP 1308 (2013) 110 [arXiv:1306.1985 hep-ph].
  • PHOKHARA 7.0:
    H. Czyż, J.H. Kühn, A. Wapienik,
    Phys. Rev. D77 (2008) 114005 [arXiv:0804.0359].
    H. Czyż, A. Grzelińska, J.H. Kühn,
    Phys. Rev. D81 (2010) 094014 [arXiv:1002.0279].
    H. Czyż, J.H. Kühn,
    Phys. Rev. D80 (2009) 034035 [arXiv:0904.0515].
  • PHOKHARA 6.0:
    H. Czyż, A. Grzelińska, J.H. Kühn,
    Phys. Rev. D75 (2007) 074026 [hep-ph/0702122].
  • PHOKHARA 5.0:
    H. Czyż, A. Grzelińska, J.H. Kühn, G. Rodrigo,
    Eur. Phys. J. C47 (2006) 617 [hep-ph/0512180].
    H. Czyż, A. Grzelińska, J.H. Kühn,
    Phys. Lett. B611 (2005) 116 [hep-ph/0412239].
  • PHOKHARA 4.0:
    H. Czyż, A. Grzelińska, J.H. Kühn, G. Rodrigo,
    Eur.Phys.J.C39(2005)411 [hep-ph/0404078].
    H. Czyż, J.H. Kühn, E. Nowak, G. Rodrigo,
    Eur.Phys.J.C35(2004)527 [hep-ph/0403062].
  • PHOKHARA 3.0:
    H. Czyż, A. Grzelińska, J.H. Kühn, G. Rodrigo,
    Eur. Phys. J. C33 (2004) 333 [hep-ph/0308312].
  • PHOKHARA 2.0:
    H. Czyż, A. Grzelińska, J.H. Kühn, G. Rodrigo,
    Eur. Phys. J. C27 (2003) 563 [hep-ph/0212225].
    J.H. Kühn, G. Rodrigo,
    Eur. Phys. J. C25 (2002) 215 [hep-ph/0204283].
  • PHOKHARA 1.0:
    G. Rodrigo, H. Czyż, J.H. Kühn, M. Szopa,
    Eur. Phys. J. C24 (2002) 71 [hep-ph/0112184].
    G. Rodrigo, A. Gehrmann-De Ridder, M. Guilleaume, J.H. Kühn, Eur. Phys. J. C22 (2001) 81 [hep-ph/0106132].
  • EVA:
    S. Binner, J.H. Kühn and K. Melnikov,
    Phys. Lett. B459 (1999) 279 [hep-ph/9902399].
  • EVA-4pi:
    H. Czyż and J.H. Kühn,
    Eur. Phys. J. C18 (2001) 497 [hep-ph/0008262].
  • Further reading:
    S. Tracz, H. Czyż,
    Acta Phys. Polon. B46 (2015) 2273
    S. Tracz, H. Czyż,
    Acta Phys. Polon. B44 (2013) 2281
    S. Ivashyn, H. Czyż, and A. Korchin,
    Acta Phys. Polon. B40 (2009) 3185 [arXiv:0910.5335].
    A. Grzelińska, H. Czyż, and A. Wapienik,
    Nucl. Phys. Proc. Suppl. 189 (2009)216 [arXiv:0812.1939].
    H. Czyż, Nucl. Phys. Proc. Suppl. 181-182 (2008) 264.
    H. Czyż and A. Grzelińska,
    Acta Phys. Polon. B38 (2007) 2989 [arXiv:0707.1275].
    H. Czyż, A. Grzelińska and A. Wapienik,
    Acta Phys. Polon. B38 (2007) 3491 [arXiv:0710.4227].
    H. Czyż, Nucl. Phys. Proc. Suppl. 162 (2006) 76 [ hep-ph/0606227].
    H. Czyż, A. Grzelińska, E. Nowak-Kubat,
    Acta Phys. Polon. B36 (2005) 3403 [hep-ph/0510208].
    H. Czyż and E. Nowak-Kubat,
    Acta Phys. Polon. B36 (2005) 3425 [hep-ph/0510287];
    Acta Phys. Polon. B34 (2003) 5231 [hep-ph/0310335].
    H. Czyż, A. Grzelińska,
    eConf C0309101(2003)FRWP007 [hep-ph/0402030];
    Acta Phys. Polon. B34 (2003) 5219 [hep-ph/0310341].
    H. Czyż, A. Grzelińska, J.H. Kühn, G. Rodrigo, Nucl. Phys. Proc. Suppl. 131 (2004) 39 [hep-ph/0312217].
    G. Rodrigo, H. Czyż, J.H. Kühn, hep-ph/0205097;
    Nucl. Phys. Proc. Suppl. 123 (2003) 167
    [hep-ph/0210287];
    Nucl. Phys. Proc. Suppl. 116 (2003) 249
    [hep-ph/0211186].
    G. Rodrigo, hep-ph/0311158;
    Acta Phys. Polon. B32 (2001) 3833 [hep-ph/0111151].
    J.H. Kühn, Nucl. Phys. Proc. Suppl. 144 (2005) 214
    Nucl. Phys. Proc. Suppl. 98 (2001) 289 [hep-ph/0101100].
  • © Last updated 8 May 2014
    http://ific.uv.es/~rodrigo/phokhara
    German.Rodrigo@cern.ch