Abstract
The KLOE-2 experiment continues and extends the program of its predecessor KLOE in the field of discrete symmetry tests with the K meson system, among other studies which comprise light meson spectroscopy, dark matter searches and γγ physics. Together, KLOE and KLOE-2 have recorded the largest sample (almost 8 fb− 1) of e+e− collisions at the energy equal to ϕ meson mass, amounting to 2.4 × 1010 of produced ϕ mesons. We report on the latest results and ongoing analyses of KLOE and KLOE-2 concerning discrete symmetry tests and measurements of symmetry-violating observables. A measurement of the CPT violation sensitive asymmetry in semileptonic decays of K˙S with 1.7 fb− 1 of KLOE data will be presented, which improves the sensitivity w.r.t. previous measurements about twice. Moreover, status of direct tests of T and CPT in transitions of neutral kaons performed with the ϕ →K˙SK˙L → πeν, 3π0(2π) processes will be reported, followed by the search of the CP-violating decay K˙S → 3π0 using the data recently acquired by KLOE-2.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
Di Domenico, A.: Handbook on neutral kaon interferometry at a Φ-factory. Frascati Phys. Ser. 43, 1–38 (2007)
Bossi, F., De Lucia, E., Lee-Franzini, J., Miscetti, S., Palutan, M.: Precision Kaon and Hadron Physics with KLOE. Riv. Nuovo Cim. 31, 531–623 (2008). https://doi.org/10.1393/ncr/i2008-10037-9
Adinolfi, M., et al.: The tracking detector of the KLOE experiment. Nucl. Instrum. Methods A488, 51–73 (2002). https://doi.org/10.1016/S0168-9002(02)00514-4
Adinolfi, M., Ambrosino, F., Antonelli, A., Antonelli, M., Anulli, F., et al.: The KLOE electromagnetic calorimeter. Nucl. Instrum. Methods A482, 364–386 (2002). https://doi.org/10.1016/S0168-9002(01)01502-9
Balla, A., et al.: Status of the cylindical-GEM project for the KLOE-2 inner tracker. Nucl. Instrum. Methods A628, 194–198 (2011). https://doi.org/10.1016/j.nima.2010.06.315
Cordelli, M., et al.: CCALT: a crystal CALorimeter with timing for the KLOE-2 upgrade. Nucl. Instrum. Methods A718, 81–82 (2013). https://doi.org/10.1016/j.nima.2012.11.074
Cordelli, M., et al.: QCALT: a tile calorimeter for KLOE-2 experiment. Nucl. Instrum. Methods A617, 105–106 (2010). https://doi.org/10.1016/j.nima.2009.09.106
Alavi-Harati, A., et al.: A measurement of the K(L) charge asymmetry. Phys. Rev. Lett. 88, 181601 (2002). https://doi.org/10.1103/PhysRevLett.88.181601
Ambrosino, F., et al.: Study of the branching ratio and charge asymmetry for the decay K(s) → π e ν with the KLOE detector. Phys. Lett. B636, 173–182 (2006). https://doi.org/10.1016/j.physletb.2006.03.047
Anastasi, A., et al.: Measurement of the charge asymmetry for the \(K_S \rightarrow \pi e \nu \) decay and test of CPT symmetry with the KLOE detector. JHEP (in print). Preprint: arXiv:1806.08654 (2018)
Bernabeu, J., Di Domenico, A., Villanueva-Perez, P.: Direct test of time-reversal symmetry in the entangled neutral kaon system at a ϕ-factory. Nucl. Phys. B868, 102–119 (2013). https://doi.org/10.1016/j.nuclphysb.2012.11.009
Bernabeu, J., Di Domenico, A., Villanueva-Perez, P.: Probing CPT in transitions with entangled neutral kaons. JHEP 10, 139 (2015). https://doi.org/10.1007/JHEP10(2015)139
Lees, J.P., et al.: Observation of time reversal violation in the B 0 Meson system. Phys. Rev. Lett. 109, 211801 (2012). https://doi.org/10.1103/PhysRevLett.109.211801
Babusci, D., et al.: A new limit on the CP violating decay K S → 3π 0 with the KLOE experiment. Phys. Lett. B723, 54–60 (2013). https://doi.org/10.1016/j.physletb.2013.05.008
Acknowledgements
We warmly thank our former KLOE colleagues for the access to the data collected during the KLOE data taking campaign. We thank the DAΦNE team for their efforts in maintaining low background running conditions and their collaboration during all data taking. We want to thank our technical staff: G.F. Fortugno and F. Sborzacchi for their dedication in ensuring efficient operation of the KLOE computing facilities; M. Anelli for his continuous attention to the gas system and detector safety; A. Balla, M. Gatta, G. Corradi and G. Papalino for electronics maintenance; C. Piscitelli for his help during major maintenance periods. This work was supported in part by the Polish National Science Centre through the Grants No. 2013/11/B/ST2/04245, 2014/14/E/ST2/00262, 2014/12/S/ST2/00459, 2016/21/N/ST2/01727, 2016/23/N/ST2/01293, 2017/26/M/ST2/00697.
Author information
Authors and Affiliations
Consortia
Corresponding author
Additional information
This article is part of the Topical Collection on Proceedings of the 7th Symposium on Symmetries in Subatomic Physics (SSP 2018), Aachen, Germany, 10–15 June 2018
Guest Edited by Hans Ströher, Jörg Pretz, Livia Ludhova and Achim Stahl
Rights and permissions
Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.
About this article
Cite this article
Gajos, A., KLOE-2 Collaboration. Tests of discrete symmetries with the neutral kaon system at the KLOE and KLOE-2 experiments. Hyperfine Interact 239, 53 (2018). https://doi.org/10.1007/s10751-018-1532-0
Published:
DOI: https://doi.org/10.1007/s10751-018-1532-0