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24 April 2024

» arxiv » 1210.3927

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Limit on the production of a light vector gauge boson in phi meson decays with the KLOE detector
KLOE-2 Collaboration ; D. Babusci ; D. Badoni ; I. Balwierz-Pytko ; G. Bencivenni ; C. Bini ; C. Bloise ; F. Bossi ; P. Branchini ; A. Budano ; L. Caldeira Balkestaahl ; G. Capon ; F. Ceradini ; P. Ciambrone ; E. Czerwinski ; E. Dane ; E. De Lucia ; G. De Robertis ; A. De Santis ; A. Di Domenico ; C. Di Donato ; R. Di Salvo ; D.Domenici ; O. Erriquez ; G. Fanizzi ; A. Fantini ; G. Felici ; S. Fiore ; P. Franzini ; P. Gauzzi ; G. Giardina ; S. Giovannella ; F. Gonnella ; E.Graziani ; F. Happacher ; L. Heijkenskj ; B. Hoistad ; L. Iafolla ; M. Jacewicz ; T. Johansson ; A. Kupsc ; J. Lee-Franzini ; B. Leverington ; F. Loddo ; S. Loffredo ; G. Mandaglio ; M. Martemianov ; M. Martini ; M. Mascolo ; R. Messi ; S. Miscetti ; G. Morello ; D. Moricciani ; P. Moskal ; F. Nguyen ; A. Passeri ; V. Patera ; I. Prado Longhi ; A. Ranieri ; C. F. Redmer ; P. Santangelo ; I. Sarra ; M. Schioppa ; B. Sciascia ; M. Silarski ; C. Taccini ; L. Tortora ; G. Venanzoni ; W. Wislicki ; M. Wolke ; J. Zdebik ;
Date:	15 Oct 2012
Abstract:	We present a new limit on the production of a light dark-force mediator with the KLOE detector at DAPHNE. This boson, called U, has been searched for in the decay phi -->eta U, with the hypothesis U-->e+e-, analyzing the decay eta-->pi0pi0pi0 in a data sample of 1.7 fb-1 integrated luminosity. This search is combined with a previous result obtained using the decay eta-->pi+pi-pi0, increasing substantially the sensitivity. No structures are observed in the e+e- invariant mass distribution over the background. Combining the two eta decay modes, we set an upper limit at 90% C.L. on the ratio between the U boson coupling constant and the fine structure constant of alpha’/alpha <= 1.5x10^-5 for 30<M_U<420 MeV and alpha’/alpha <= 5.0x10^-6 for the sub-region 60<M_U<190 MeV. This result assumes the Vector Meson Dominance expectations for the phi-eta-gamma^* transition form factor. The dependence of this limit on the transition form factor has also been studied.
Source:	arXiv, 1210.3927
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