Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector

A. Anastasi, D. Babusci, G. Bencivenni, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Dané, V. De Leo, E. De Lucia, A. De Santis, P. De SimoneA. Di Cicco, A. Di Domenico, R. Di Salvo, D. Domenici, A. D'Uffizi, A. Fantini, G. Felici, S. Fiore, A. Gajos, P. Gauzzi, G. Giardina, S. Giovannella, E. Graziani, F. Happacher, L. Heijkenskjöld, T. Johansson, D. Kamińska, W. Krzemien, A. Kupsc, S. Loffredo, P. A. Lukin, G. Mandaglio, M. Martini, M. Mascolo, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, M. Papenbrock, The KLOE-2 Collaboration

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20 Citations (Scopus)

Abstract

We have measured the running of the effective QED coupling constant α(s) in the time-like region 0.6<s<0.975 GeV with the KLOE detector at DAΦNE using the Initial-State Radiation process e+e→μ+μγ. It represents the first measurement of the running of α(s) in this energy region. Our results show a more than 5σ significance of the hadronic contribution to the running of α(s), which is the strongest direct evidence both in time- and space-like regions achieved in a single measurement. By using the e+e→π+π cross section measured by KLOE, the real and imaginary parts of the shift Δα(s) have been extracted. From a fit of the real part of Δα(s) and assuming the lepton universality the branching ratio BR(ω→μ+μ)=(6.6±1.4stat±1.7syst)⋅10−5 has been determined.

Original languageEnglish
Pages (from-to)485-492
Number of pages8
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume767
DOIs
Publication statusPublished - 10 Apr 2017

Keywords

  • Vacuum polarization
  • α running
  • LUMINOSITY
  • MUON PAIR PRODUCTION
  • HADRONIC CROSS-SECTION
  • FSR
  • ANGLE BHABHA SCATTERING
  • VACUUM POLARIZATION
  • RADIATIVE RETURN
  • E(+)E(-)
  • arunning

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