Precision measurement of the η → π + π − π 0 Dalitz plot distribution with the KLOE detector

• DOI: 10.1007/jhep05(2016)019
• Publication Date: 2016-05-05T11:14:14Z
• Authors: A. Anastasi; D. Babusci; G. Bencivenni; M. Berlowski; C. Bloise; F. Bossi; P. Branchini; A. Budano; L. Caldeira Balke...; B. Cao; F. Ceradini; P. Ciambrone; F. Curciarello; E. Czerwinski; G. D’Agostini; E. Danè; V. De Leo; E. De Lucia; A. De Santis; P. De Simone; A. Di Cicco; A. Di Domenico; R. Di Salvo; D. Domenici; A. D’Uffizi; A. Fantini; G. Felici; S. Fiore; A. Gajos; P. Gauzzi; G. Giardina; S. Giovannella; E. Graziani; F. Happacher; L. Heijkenskjöld; W. Ikegami Andersson; T. Johansson; D. Kaminska; W. Krzemien; A. Kupsc; S. Loffredo; G. Mandaglio; M. Martini; M. Mascolo; R. Messi; S. Miscetti; G. Morello; D. Moricciani; P. Moskal; M. Papenbrock; A. Passeri; V. Patera; E. Perez del Rio; A. Ranieri; P. Santangelo; I. Sarra; M. Schioppa; M. Silarski; F. Sirghi; L. Tortora; G. Venanzoni; W. Wislicki; M. Wolke
• Keywords: Dalitz plot; Dimensionless quantity

Using 1.6 fb−1 of e + − → ϕ ηγ data collected with the KLOE detector at DAΦNE, Dalitz plot distribution for η π 0 decay is studied world's largest sample ∼ 4.7 · 106 events. The density parametrized as a polynomial expansion up to cubic terms in normalized dimensionless variables X and Y . experiment sensitive all charge conjugation conserving expansion, including gX 2 term. statistical uncertainty parameters improved by factor two respect earlier measurements.