12-16 October 2015
Hungarian Academy of Sciences
Europe/Budapest timezone

Observation of long-lived states of hydrogen-like atom consisting of pi+ and pi- mesons.

Oct 13, 2015, 11:00 AM
45m
Kis terem (Small conference room) (Hungarian Academy of Sciences)

Kis terem (Small conference room)

Hungarian Academy of Sciences

1051 Budapest, Széchenyi tér 9.

Speaker

Leonid Afanasyev (Joint Inst. for Nuclear Research (RU))

Description

DIRAC experiment at the CERN PS accelerator observes for the first time long-lived states of hydrogen-like atom consisting of $\pi^+$ and $\pi^-$ mesons with lifetimes of about 10−11~s and more. There were observed $436\pm61$ characteristic pion pairs resulting from the long-lived states breakup, that corresponds to a signal-to-error ratio of better than 7 standard deviations. Together with measurement of the ground state lifetime of $\pi^+\pi^-$ atom, this observation opens a new possibility for detailed study of $\pi\pi$ scattering lengths.

Primary author

Leonid Afanasyev (Joint Inst. for Nuclear Research (RU))

Presentation materials