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Determination of pi pi scattering lengths from measurement of pi(+)pi(-) atom lifetime
- 1.0367051 - ÚJF 2012 RIV NL eng J - Journal Article
Adeva, B. - Afanasyev, L. - Benayoun, M. - Hons, Zdeněk … Total 95 authors
Determination of pi pi scattering lengths from measurement of pi(+)pi(-) atom lifetime.
Physics Letters. B. Roč. 704, 1-2 (2011), s. 24-29. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA ČR GAP203/10/0310
Institutional research plan: CEZ:AV0Z10480505
Keywords : DIRAC experiment * Elementary atom * Pionium atom
Subject RIV: BG - Nuclear, Atomic and Molecular Physics, Colliders
Impact factor: 3.955, year: 2011
The DIRAC experiment at CERN has achieved a sizeable production of pi(+)pi(-) atoms and has significantly improved the precision on its lifetime determination. From a sample of 21 227 atomic pairs, a 4% measurement of the S-wave pi pi scattering length difference |a(0) - a(2)| = (0.2533(-0.0078)(+0.0080)|stat(-0.0073)(+0.0078)|syst)M(pi+)(-1) has been attained, providing an important test of Chiral Perturbation Theory. (C) 2011 Elsevier B.V. All rights reserved.
Permanent Link: http://hdl.handle.net/11104/0201839
Number of the records: 1