About
The NA48/2 experiment at the CERN SPS has collected more than 100 million fully reconstructed K±-->π±π0π0 decays.
The preliminary analysis of a third of the data shows a sudden change of slope of the π0π0 invariant mass distribution in the region around 2m, where m is the mass of the charged pion. This anomaly, which was never observed before, is interpreted as a cusp-like effect resulting mainly from the contribution of the K±-->π±π0π0 decay amplitude through π+π- -->π0π0 charge exchange.
The study of this phenomenon is a new and potentially more accurate method to measure a0-a2, the difference of the I = 0 and I = 2 S-wave scattering lengths.
The colloquium will consist of two parts: the experiment, given by Italo Mannelli, and the theory by Nicola Cabibbo.
Organiser(s): Luis Alvarez-Gaume / PH-TH
Note: * Tea & coffee will be served at 16.00 hrs..
0:00:00 Slide 1
0:06:44 Slide 2
0:13:27 Slide 3
0:20:10 Slide 4
0:26:53 Slide 5
0:33:36 Slide 6
The talk
Credits and licence
- Institution
- CERN
- Department
- CERN Colloquium
- Speaker
- Nicola Cabibbo, Italo Mannelli (Univ. La Sapienza, Roma and Scuola Normale Superiore, Pisa),
- Year
- 2005
- Language
- English
- Source
- CERN
- Licence
- CERN, as CERN states it. CERN's terms
- Attribution
- © CERN. CERN provides its audiovisual media free of charge for educational and informational use, credited to CERN; this lecture is shown in CERN's own player.
- Who can watch
- CERN gives no rating. Invisible Network shows it to Teens profiles and older, judged from what the source says about it. How courses are placed