ISSN 0253-2778

CN 34-1054/N

Open AccessOpen Access JUSTC

Results on hadronic cross sections at KLOE

Cite this:
https://doi.org/10.3969/j.issn.0253-2778.2016.04.005
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  • Author Bio:

    DE LEO V., female, born in 1986, PhD. Research field: particle physics.

  • Received Date: 30 November 2015
  • Rev Recd Date: 20 April 2016
  • Publish Date: 30 April 2016
  • The precise determination of the e+e-→π+π-(γ) cross section is particularly important to evaluate the hadronic loop contribution to the SM calculation of the muon (g-2), where a long-standing 3σ discrepancy with the direct experimental determination is observed. The KLOE experiment studied the production of π+π- in the ISR channel and published three measurements (in 2005, 2008 and 2012) of the π+π- cross section with the ISR photon emitted at small angles and an independent measurement (in 2010) with the ISR photon emitted at large angles and using data at a collision energy of 1 GeV. The combination of the last analysis (KLOE12) with two previously published (KLOE08, KLOE10) together with the preliminary fit by using the Gounaris-Sakurai model is presented.
    The precise determination of the e+e-→π+π-(γ) cross section is particularly important to evaluate the hadronic loop contribution to the SM calculation of the muon (g-2), where a long-standing 3σ discrepancy with the direct experimental determination is observed. The KLOE experiment studied the production of π+π- in the ISR channel and published three measurements (in 2005, 2008 and 2012) of the π+π- cross section with the ISR photon emitted at small angles and an independent measurement (in 2010) with the ISR photon emitted at large angles and using data at a collision energy of 1 GeV. The combination of the last analysis (KLOE12) with two previously published (KLOE08, KLOE10) together with the preliminary fit by using the Gounaris-Sakurai model is presented.
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