Search for the CP violating $K_{S} \rightarrow 3\pi^{0}$ decay with the KLOE detector

doi:10.1088/1742-6596/447/1/012028

Search for the CP violating $K_{S} \rightarrow 3\pi^{0}$ decay with the KLOE detector

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Search for the CP violating $K_{S} \rightarrow 3\pi^{0}$ decay with the KLOE detector

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title:	Search for the CP violating $K_{S} \rightarrow 3\pi^{0}$ decay with the KLOE detector
author:	Silarski Michał , Babusci D., Badoni D., Pytko Izabela , Bencivenni G., Bini C., Bloise C., Bossi F., Branchini P., Budano A., Caldeira Balkeståhl L., Capon G., Ceradini F., Ciambrone P., Curciarello F., Czerwiński Eryk , Danè E., De Leo V., De Lucia E., De Robertis G., De Santis A., Di Domenico A., Di Donato C., Di Salvo R., Domenici D., Erriquez O., Fanizzi G., Fantini A., Felici G., Fiore S., Franzini P., Gauzzi P., Giardina G., Giovannella S., Gonnella F., Graziani E., Happacher F., Heijkenskjold L., Hoistad B., Iafolla L., Jacewicz M., Johansson T., Kacprzak K., Kupsc A., Lee-Franzini J., Leverington B., Loddo F., Loffredo S., Mandaglio G., Martemianov M., Martini M., Mascolo M., Messi R., Miscetti S., Morello G., Moricciani D., Moskal Paweł , Nguyen F., Passeri A., Patera V., Prado Longhi I., Ranieri A., Redmer C. F., Santangelo P., Sarra I., Schioppa M., Sciascia B., Taccini C., Tortora L., Venanzoni G., Wiślicki W., Wolke M., Zdebik Jarosław
institution:	KLOE-2 Collaboration
journal title:	Journal of Physics. Conference Series
title of volume:	DISCRETE 2012 – Third Symposium on Prospects in the Physics of Discrete Symmetries : 3-7 December 2013, IST Congress Center, Lisbon, Portugal
volume:	447
date of publication :	2013
article ID:	012028
ISSN:	1742-6588
eISSN:	1742-6596
DOI:	10.1088/1742-6596/447/1/012028
notes:	Autorka Izabela Pytko podpisana jako: Izabela Balwierz-Pytko.
language:	English
journal language:	English
abstract in English:	We present a new search for the $K_{S}\rightarrow 3\pi ^{0}$ decay performed with the KLOE detector operating at the DAΦNE $\phi$ -factory. The $K_{S}$ mesons were tagged via registration of $K_{L}$ mesons which crossed the drift chamber without decaying and interacted with the KLOE electromagnetic calorimeter. The $K_{S}\rightarrow 3\pi ^{0}$ decay was then searched requiring six prompt photons. To suppress background, originating from fake $K_{S}$ tags and $K_{S}\rightarrow 2\pi ^{0}$ decays with additional two spurious clusters, we have performed a discriminant analysis based on kinematical fit, testing of the signal and background hypotheses and exploiting of the differences in kinematics of the $K_{S}$ decays into $2\pi ^{0}$ and $3\pi ^{0}$. In a sample of about 1.7$\cdot 10^{9} \phi \rightarrow K_{S}K_{L}$ events we have found no candidates in data and simulated background samples. Normalizing to the number of $K_{S}\rightarrow 2\pi^{0}$ events in the same sample, we have set the upper limit on the $K_{S}\rightarrow 3\pi^{0}$ branching ratio BR $\left ( K_{S}\rightarrow 3\pi^{0} \right )< 2.6\cdot 10^{-8}$ at 90% C.L., five times lower than the previous limit. This upper limit can be translated into a limit on the modulus of the $\eta _{000}$ parameter amounting to $\left \| \eta _{000} \right \|< 0.0088$ at 90% C.L., improving by a factor two the latest direct measurement.
number of pulisher's sheets:	0,5
conference:	DISCRETE 2012 – Third Symposium on Prospects in the Physics of Discrete Symmetries; 2013-12-03; 2013-12-07; Lizbona; Portugalia; indeksowana w Web of Science; indeksowana w Scopus; ;
affiliation:	Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
type:	journal article
subtype:	conference proceedings