Abstract
Using 1.6 fb−1 of e + e − → ϕ → ηγ data collected with the KLOE detector at DAΦNE, the Dalitz plot distribution for the η → π + π − π 0 decay is studied with the world’s largest sample of ∼ 4.7 · 106 events. The Dalitz plot density is parametrized as a polynomial expansion up to cubic terms in the normalized dimensionless variables X and Y . The experiment is sensitive to all charge conjugation conserving terms of the expansion, including a gX 2 Y term. The statistical uncertainty of all parameters is improved by a factor two with respect to earlier measurements.
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References
D.G. Sutherland, Current algebra and the decay η → 3π, Phys. Lett. 23 (1966) 384 [INSPIRE].
J.S. Bell and D.G. Sutherland, Current algebra and η → 3π, Nucl. Phys. B 4 (1968) 315 [INSPIRE].
R. Baur, J. Kambor and D. Wyler, Electromagnetic corrections to the decays η → 3π, Nucl. Phys. B 460 (1996) 127 [hep-ph/9510396] [INSPIRE].
C. Ditsche, B. Kubis and U.-G. Meißner, Electromagnetic corrections in η → 3π decays, Eur. Phys. J. C 60 (2009) 83 [arXiv:0812.0344] [INSPIRE].
J. Bijnens and J. Gasser, Eta decays at and beyond p 4 in chiral perturbation theory, Phys. Scripta T 99 (2002) 34 [hep-ph/0202242] [INSPIRE].
H. Leutwyler, The ratios of the light quark masses, Phys. Lett. B 378 (1996) 313 [hep-ph/9602366] [INSPIRE].
R.F. Dashen, Chiral SU(3) × SU(3) as a symmetry of the strong interactions, Phys. Rev. 183 (1969) 1245 [INSPIRE].
J. Gasser and H. Leutwyler, η → 3π to one loop, Nucl. Phys. B 250 (1985) 539 [INSPIRE].
Particle Data Group collaboration, K.A. Olive et al., Review of particle physics, Chin. Phys. C 38 (2014) 090001 [INSPIRE].
J. Bijnens and K. Ghorbani, η → 3π at two loops in chiral perturbation theory, JHEP 11 (2007) 030 [arXiv:0709.0230] [INSPIRE].
B. Borasoy and R. Nissler, Hadronic η and η ′ decays, Eur. Phys. J. A 26 (2005) 383 [hep-ph/0510384] [INSPIRE].
S.P. Schneider, B. Kubis and C. Ditsche, Rescattering effects in η → 3π decays, JHEP 02 (2011) 028 [arXiv:1010.3946] [INSPIRE].
K. Kampf, M. Knecht, J. Novotný and M. Zdráhal, Analytical dispersive construction of η → 3π amplitude: first order in isospin breaking,Phys. Rev. D 84 (2011) 114015 [arXiv:1103.0982] [INSPIRE].
G. Colangelo, S. Lanz, H. Leutwyler and E. Passemar, Determination of the light quark masses from η → 3π, PoS(EPS-HEP2011)304 [INSPIRE].
P. Guo et al., Three-body final state interaction in η → 3π, Phys. Rev. D 92 (2015) 054016 [arXiv:1505.01715] [INSPIRE].
M. Gormley et al., Experimental determination of the Dalitz-plot distribution of the decays η→π + π − π 0 and η→π + π − γ and the branching ratio η→π + π − γ/η → π +, Phys. Rev. D 2 (1970) 501 [INSPIRE].
J.G. Layter et al., Study of Dalitz-plot distributions of the decays η → π + π − π 0 and η → π + π − γ, Phys. Rev. D 7 (1973) 2565 [INSPIRE].
Crystal Barrel collaboration, A. Abele et al., Momentum dependence of the decay η → π + π − π 0, Phys. Lett. B 417 (1998) 197 [INSPIRE].
KLOE collaboration, F. Ambrosino et al., Determination of η → π + π − π 0 Dalitz plot slopes and asymmetries with the KLOE detector, JHEP 05 (2008) 006 [arXiv:0801.2642] [INSPIRE].
WASA-at-COSY collaboration, P. Adlarson et al., Measurement of the η → π + π − π 0 Dalitz plot distribution, Phys. Rev. C 90 (2014) 045207 [arXiv:1406.2505] [INSPIRE].
BESIII collaboration, M. Ablikim et al., Measurement of the matrix elements for the decays η → π + π − π 0 and η/η ′ → π 0 π 0 π 0, Phys. Rev. D 92 (2015) 012014 [arXiv:1506.05360] [INSPIRE].
J. Kambor, C. Wiesendanger and D. Wyler, Final state interactions and Khuri-Treimanequations in η → 3π decays, Nucl. Phys. B 465 (1996) 215 [hep-ph/9509374] [INSPIRE].
M. Adinolfi et al., The tracking detector of the KLOE experiment, Nucl. Instrum. Meth. A 488 (2002) 51 [INSPIRE].
M. Adinolfi et al., The KLOE electromagnetic calorimeter, Nucl. Instrum. Meth. A 482 (2002) 364 [INSPIRE].
KLOE collaboration, M. Adinolfi et al., The trigger system of the KLOE experiment, Nucl. Instrum. Meth. A 492 (2002) 134 [INSPIRE].
F. Ambrosino et al., Data handling, reconstruction and simulation for the KLOE experiment, Nucl. Instrum. Meth. A 534 (2004) 403 [physics/0404100] [INSPIRE].
M. Gormley et al., Experimental test of C invariance in η → π + π − π 0, Phys. Rev. Lett. 21 (1968) 402 [INSPIRE].
J.G. Layter et al., Measurement of the charge asymmetry in the decay η → π + π − π 0, Phys. Rev. Lett. 29 (1972) 316 [INSPIRE].
M.R. Jane et al., A measurement of the charge asymmetry in the decay η → π + π − π 0, Phys. Lett. B 48 (1974) 260 [INSPIRE].
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The KLOE-2 collaboration., Anastasi, A., Babusci, D. et al. Precision measurement of the η → π + π − π 0 Dalitz plot distribution with the KLOE detector. J. High Energ. Phys. 2016, 19 (2016). https://doi.org/10.1007/JHEP05(2016)019
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DOI: https://doi.org/10.1007/JHEP05(2016)019