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Kaon International Conference

21–25 May 2007
Laboratori Nazionali di Frascati dell'INFN
Europe/Rome timezone

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Session

Session III

5
22 May 2007, 17:20
High Energy Building - Aula Bruno Touschek (Laboratori Nazionali di Frascati dell'INFN)

High Energy Building - Aula Bruno Touschek

Laboratori Nazionali di Frascati dell'INFN

Via E. Fermi, 40 00044 Frascati

Conveners

Session III: Low Energy QCD

  • Gilberto Colangelo (Bern Univ.)

Session III: Low Energy QCD

  • Juerg Gasser (Bern Univ.)

Presentation materials

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  1. 21. Theoretical progress on cusp effect and Kl4
    Prof. Juerg Gasser (Berna University)
    22/05/2007, 17:20
    Low energy QCD
    Data on hadronic reactions have become so precise by now that one has to take into account radiative corrections as completely as possible. My talk will concentrate on this issue from a theoretical point of view, for K->3 pi and K_e4 decays.
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  2. 44. Precision study of K+- into pi+- pi0 pi0 and K+- into pi+- pi+ pi- Dalitz plot distributions by NA48/2.
    Dr Evgueni Goudzovski (Scuola Normale Superiore and INFN, Pisa)
    22/05/2007, 17:50
    Low energy QCD
    The NA48/2 experiment at the CERN SPS has collected an unprecedented sample of 3-pion decays of charged kaons. The high statistics and the good resolution of the detectors allow a unique investigation of the detailed phase space distributions of these decays. The effects of final state pion rescattering observed in the Dalitz plot distribution of the K+- into pi+- pi0 pi0 decays turned...
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  3. 45. Recent results from NA48/2 on Ke4 decays and interpretation in term of pi-pi scattering lengths
    Mrs Brigitte BLOCH-DEVAUX (DAPNIA/SPP CEA-SACLAY ( FRANCE))
    22/05/2007, 18:10
    Low energy QCD
    The NA48/2 experiment at the CERN SPS has collected about 10**6 K± decays into pi+ pi- e± ν (Ke4) in 2003 and 2004. The analysis of a partial sample of ~500000 such events allows a precise measurement of the decay parameters. The form factors of the reaction and their dependence with dipion and dilepton masses have been measured. Thanks to a sizeable acceptance at large Mpipi...
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  4. 58. An update of the DIRAC result on the pion-pion |a0-a2| scattering length
    Prof. Ludwig Tauscher (Basel University)
    22/05/2007, 18:30
    Low energy QCD
    DIRAC aims at measuring the scattering length |a0-a2| through the lifetime of the pi+pi- atom in its 1S state. The published result (Physics Letters B 619 (2005)) used only part of the totally collected statistics. An update of the result concerning the statistical accuracy will be presented.
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  5. 61. Kaonic X-ray experiments at DAFNE using SIDDHARTA
    Michael Cargnelli (Austrian Academy of Sciences - Stefan Meyer Institute)
    22/05/2007, 18:50
    Low energy QCD
    At the DAFNE electron-positron collider of Laboratori Nazionali di Frascati we study kaonic atoms, taking advantage of the low-energy kaons produced in the phi-meson decay. The kaon-nucleon interaction at rest in kaonic hydrogen and kaonic deuterium can be investigated under favorable conditions. The DEAR (DAFNE Exotic Atom Research) experiment at LNF delivered the most precise data on...
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  6. 20. Theoretical progress on pi-pi scattering lengths and phases
    Prof. Gilberto Colangelo (Berna University)
    23/05/2007, 09:00
    Low energy QCD
  7. 74. Review of pi-pi scattering measurements in K decays
    Prof. Luigi Di Lella (Scuola Normale Superiore di Pisa)
    23/05/2007, 09:30
    Low energy QCD
    Over the last few years it has become possible to study low energy ππ scattering in K decays to three pions, thanks to the high statistics measurement of K±→ π±π°π° decay with excellent π°π° invariant mass resolution performed by the NA48/2 experiment at the CERN SPS. The information on the ππ scattering lengths which can be extracted from these results is reviewed and compared with the...
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