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1.	Anastasi, A., et al. (author) Limit on the production of a new vector boson in e+e− → Uγ, U → π+π− with the KLOE experiment 2016 In: Physics Letters B. - : Elsevier BV. - 0370-2693 .- 1873-2445. ; 757, s. 356-361 Journal article (peer-reviewed)abstract Abstract The recent interest in a light gauge boson in the framework of an extra U(1) symmetry motivates searches in the mass range below 1 GeV. We present a search for such a particle, the dark photon, in e + e − → U γ , U → π + π − based on 28 million e + e − → π + π − γ events collected at DAΦNE by the KLOE experiment. The π + π − production by initial-state radiation compensates for a loss of sensitivity of previous KLOE U → e + e − , μ + μ − searches due to the small branching ratios in the ρ – ω resonance region. We found no evidence for a signal and set a limit at 90% CL on the mixing strength between the photon and the dark photon, ε 2 , in the U mass range between 527 and 987 MeV . Above 700 MeV this new limit is more stringent than previous ones.
2.	Anastasi, A., et al. (author) Precision measurement of the η → π + π − π 0 Dalitz plot distribution with the KLOE detector 2016 In: Journal of High Energy Physics (JHEP). - 1126-6708 .- 1029-8479. ; :5 Journal article (peer-reviewed)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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Type of publication: journal article (2)

Type of content: peer-reviewed (2)

Author/Editor: Ceradini, F. (2); Di Domenico, A. (2); Gauzzi, P. (2); Graziani, E. (2); Passeri, A. (2); Schioppa, M. (2); show more...; Branchini, P. (2); Morello, G. (2); Miscetti, S. (2); Happacher, F. (2); D'Agostini, G. (2); Wolke, Magnus (2); Johansson, Tord (2); Ikegami Andersson, W ... (2); Papenbrock, Michael (2); Felici, G. (2); Patera, V (2); Tortora, L. (2); De Simone, P (2); Anastasi, A (2); Berlowski, M. (2); Czerwinski, E. (2); Heijkenskjöld, Lena (2); Krzemien, W. (2); Moskal, P. (2); Bencivenni, G. (2); Ciambrone, P. (2); Domenici, D. (2); Fiore, S. (2); di Salvo, R (2); Fantini, A. (2); Mandaglio, G. (2); Messi, R. (2); Moricciani, D. (2); Budano, A (2); Bloise, C. (2); Bossi, F. (2); De Lucia, E. (2); De Santis, A. (2); Giovannella, S. (2); Martini, M. (2); Santangelo, P. (2); Silarski, M. (2); Venanzoni, G. (2); Babusci, D. (2); Dané, E. (2); Ranieri, A. (2); Sarra, I. (2); Wiślicki, W. (2); Curciarello, F. (2); show less...

University: Uppsala University (2)

Language: English (2)

Research subject (UKÄ/SCB): Natural sciences (2)

Year: 2016 (2)Undo refine

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