First measurement of the pi+ pi- atom lifetime - INSPIRE

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First measurement of the pi+ pi- atom lifetime

DIRAC

Collaboration

•

B. Adeva

Apr, 2005

17 pages

Published in:

Phys.Lett.B 619 (2005) 50-60

e-Print:

hep-ex/0504044 [hep-ex]

DOI:

10.1016/j.physletb.2005.05.045

Experiments:

CERN-PS-212

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Abstract: (Elsevier)

The goal of the DIRAC experiment at CERN (PS212) is to measure the π+π− atom lifetime with 10% precision. Such a measurement would yield a precision of 5% on the value of the S -wave ππ scattering lengths combination |a0−a2| . Based on part of the collected data we present a first result on the lifetime, τ=[2.91−0.62+0.49]×10−15 s, and discuss the major systematic errors. This lifetime corresponds to |a0−a2|=0.264−0.020+0.033mπ−1 .

Note:

18 pages, 6 figures

25.80.E
29.30.Aj
25.80.Gn
32.70.Cs
36.10.-k
DIRAC experiment
Elementary atom
Pionium atom
Pion scattering
25.80.E

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