A. Rodriguez Fernandez

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^-

Determination of

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

\pi\pi

S

scattering lengths from measurement of

-wave

\pi^+\pi^-

\pi\pi

atom lifetime

scattering lengths combination

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

|a_0-a_2|

Detection of atoms consisting of π+ and π− mesons at PS CERN

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

First measurement of the p + p - atom lifetime

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