Two-photon physics capabilities of KLOE at DAΦNE

G. Alexander, F. Anulli, D. Babusci, R. Baldini-Ferroli, M. Bassetti, S. Bellucci, I. Cohen, A. Courau, G. Giordano, G. Matone, A. Moalem, M. A. Moinester, G. Pancheri, M. Preger, L. Razdolkaja, P. Sergio, P. Tini-Brunozzi, A. Zallo

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

A feasibility study has been carried out for high-precision measurements of two-photon reactions leading to hadrons at the DAΦNE electron-positron collider. This new facility will operate at a c.m. energy of 1.02 GeV and up to a maximum of 1.5 GeV. It will have a luminosity of L⋍5·1032 cm−2s−1, 100 times larger than the present available e+e colliders. DAΦNE offers an excellent opportunity to study γγ reactions at low energy with high statistics, using the KLOE detector equipped with electron tagging facilities as described in this report. Among the various topics that one may address in these studies, we concentrate on the following: 1) Precision measurements of the polarizabilities of charged and neutral pions via the two-photon reactions γγ→ππ. These will allow tests of chiral theories and chiral perturbation techniques, as well as other theoretical approaches. 2) Measurements for the first time of the azimuthal correlations of the γγ→ππ and other two-photon reactions. These provide new tests of the validity of chiral and other theories. 3) Formation of the C=+1 light pseudoscalar mesons, π0, η and η′. This allows the study of the(Formula presented.) and possibly gluonic inner structure of these mesons. For the π0 its measured radiative width will also improve the currently known lifetime. 4) The possibility to realize a double tagging at DAΦNE will allow reliable measurements of the currently little known total γγ→hadrons cross-section below 1 GeV, to be compared with several models. The physics program described above cannot be realized without tagging the two-photon reactions to suppress the background from e+e annihilation channels and other sources.

Original languageEnglish
Pages (from-to)837-861
Number of pages25
JournalLa Rivista del Nuovo Cimento
Volume107
Issue number6
DOIs
StatePublished - 1 Jan 1994

Keywords

  • 13.60.Le - Meson and meson-resonance production
  • 29.90 - Other topics in elementary-particle and nuclear physics experimental methods and instrumentations

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