A. Benelli

First measurement of the π+π- atom lifetime

The goal of the DIRAC experiment at CERN (PS212) is to measure the

DIRAC: A High Resolution Spectrometer for Pionium Detection

\pi^+\pi^-

Detection of π+π− atoms with the DIRAC spectrometer at CERN

atom lifetime with 10% precision. Such a measurement would yield a precision of 5% on the value of the

First πK atom lifetime and πK scattering length measurements

S

Measurement of the

-wave

\pi K

\pi\pi

atom lifetime and the

scattering lengths combination

\pi K

|a_0-a_2|

scattering length

. Based on part of the collected data we present a first result on the lifetime,

Observation of

\tau=[2.91 ^{+0.49}_{-0.62}]\times 10^{-15}