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Determination of light quark masses from eta-->3pi0
Deandrea A., Nehme A., Talavera P.
Physical Review D 78 (2008) 034032 - http://hal.in2p3.fr/in2p3-00271540
Physique/Physique des Hautes Energies - Phénoménologie
Determination of light quark masses from eta-->3pi0
A. Deandrea1, A. Nehme, P. Talavera
1 :  IPNL - Institut de Physique Nucléaire de Lyon
CNRS : UMR5822 – IN2P3 – Université Claude Bernard - Lyon I (UCBL)
We provide a model-independent determination of the quantity B_0(m_d-m_u). Our approach rests only on chiral symmetry and data from the decay of the eta into three neutral pions. Since the low-energy prediction at next-to-leading order fails to reproduce the experimental results, we keep the strong interaction correction as an unknown parameter. As a first step, we relate this parameter to the quark mass difference using data from the Dalitz plot. A similar relation is obtained using data from the decay width. Combining both relations we obtain B_0(m_d-m_u)=(4495 +/- 440) MeV^2. We use the preceding value to estimate the size of the violation of Dashen's theorem and the quark mass ratio m_u/m_d.

Articles dans des revues avec comité de lecture
Physical Review D (Phys. Rev. D)
Publisher American Physical Society
ISSN 1550-7998 (eISSN : 1550-2368)

LYCEN 2008-03
12.39.Fe, 11.30.Rd, 14.40.Aq
10 pages
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