First measurement of the atom lifetime

B ADEVA,L G Afanasyev,M BENAYOUN,A BENELLI,Z BERKA,V BREKHOVSKIKH,G CARAGHEORGHEOPOL,T CECHAK,Masakuni Chiba,S CONSTANTINESCU,C Detraz,D Dreossi, Daniel Drijard,Alexey Dudarev,Ioannis Evangelou,M Ferroluzzi,M V Gallas, Josef Gerndt,R Giacomich,P Gianotti, D Goldin,F Gomez, A M Gorin,O E Gorchakov,C Guaraldo, Marc Hansroul,R Hosek,M Iliescu,V V Karpukhin,J Kluson,Masaaki Kobayashi, P Kokkas, V Iu Komarov, V B Kruglov,L Kruglova,A I Kulikov,A Kuptsov,I Kurochkin,K Kuroda,A Lamberto, A Lanaro,V G Lapshin,R Lednicky,Ph Leruste,P Levi Sandri,A Lopez Aguera,V Lucherini,T Maki,N Manthos,I Manuilov,L Montanet, J L Narjoux, L L Nemenov,M Nikitin,T Nunez Pardo, Kunihiro Okada,V Olchevskii,A Tapia Pazos,M Pentia, A Penzo,J M Perreau,C Petrascu, M Plo,T Ponta,D Pop,G F Rappazzo,A Rodriguez Fernandez,Aldo Humberto Romero, A V Ryazantsev,V I Rykalin, C Santamarinarios,J Saborido,J Schacher,Ch P Schuetz,A Sidorov,J Smolik,F Takeutchi,A V Tarasov,L Tauscher,M J Tobar,S Trusov,V Utkin,O Vazquez Doce,P Vazquez,S Vlachos,V Yazkov, Yumiko Yoshimura,M Zhabitsky,P Zrelov

Physics Letters B（2005）

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摘要

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.

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关键词

36.10.-k,32.70.Cs,25.80.E,25.80.Gn,29.30.Aj

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