First measurement of the pi(+)pi(-) atom lifetime (Journal article)

Adeva, B./ Afanasyev, L./ Benayoun, M./ Benelli, A./ Berka, Z./ Brekhovskikh, V./ Caragheorgheopol, G./ Cechak, T./ Chiba, M./ Constantinescu, S./ Detraz, C./ Dreossi, D./ Drijard, D./ Dudarev, A./ Evangelou, I./ Ferro-Luzzi, M./ Gallas, M. V./ Gerndt, J./ Giacomich, R./ Gianotti, P./ Goldin, D./ Gomez, F./ Gorin, A./ Gorchakov, O./ Guaraldo, C./ Hansroul, M./ Hosek, R./ Iliescu, M./ Karpukhin, V./ Kluson, J./ Kobayashi, M./ Kokkas, P./ Komarov, V./ Kruglov, V./ Kruglova, L./ Kulikov, A./ Kuptsov, A./ Kurochkin, I./ Kuroda, K. I./ Lamberto, A./ Lanaro, A./ Lapshin, V./ Lednicky, R./ Leruste, P./ Sandri, P. L./ Aguera, A. L./ Lucherini, V./ Maki, T./ Manthos, N./ Manuilov, I./ Montanet, L./ Narjoux, J. L./ Nemenov, L./ Nikitin, M./ Pardo, T. N./ Okada, K./ Olchevskii, V./ Pazos, A./ Pentia, M./ Penzo, A./ Perreau, J. M./ Petrascu, C./ Plo, M./ Ponta, T./ Pop, D./ Rappazzo, G. F./ Fernandez, A. R./ Romero, A./ Ryazantsev, A./ Rykalin, V./ Santamarina, C./ Saborido, J./ Schacher, J./ Schuetz, C. P./ Sidorov, A./ Smolik, J./ Takeutchi, F./ Tarasov, A./ Tauscher, L./ Tobar, M. J./ Trusov, S./ Utkin, V./ Doce, O. V./ Vazquez, P./ Vlachos, S./ Yazkov, V./ Yoshimura, Y./ Zhabitsky, M./ Zrelov, P.

The goal of the DIRAC experiment at CERN (PS212) is to measure the pi(+)pi(-) atom lifetime with 10% precision. Such a measurement would yield a precision of 5% on the value of the S-wave pi pi scattering lengths combination vertical bar a(0)-a(2)vertical bar. Based on part of the collected data we present a first result on the lifetime, tau = [2.91(-0.62)(+0.49)] x 10(-15) s, and discuss the major systematic errors. This lifetime corresponds to vertical bar a(0)-a(2)vertical bar = 0.264(-0.020)(+0.033) m(pi)(-1). (c) 2005 Elsevier B.V. All rights reserved.
Institution and School/Department of submitter: Πανεπιστήμιο Ιωαννίνων. Σχολή Επιστημών και Τεχνολογιών. Τμήμα Βιολογικών Εφαρμογών και Τεχνολογιών
Keywords: dirac experiment,elementary atom,pionium atom,pion scattering,relativistic elementary atoms,cross-sections,pi(-) mesons,pionium,energy,matter,scattering,spectrometer,excitation,formalism
URI: https://olympias.lib.uoi.gr/jspui/handle/123456789/16135
ISSN: 0370-2693
Link: <Go to ISI>://000230280100008
http://ac.els-cdn.com/S0370269305007021/1-s2.0-S0370269305007021-main.pdf?_tid=0d5cd5b73869c380426496ba968f73e7&acdnat=1334228264_f37fde9567f53616d92c8eeb7f694456
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