Measurement of the charge asymmetry for the KS → πeν decay and test of CPT symmetry with the KLOE detector

Journal of High Energy Physics, Sep 2018

Abstract Using 1.63 fb−1 of integrated luminosity collected by the KLOE experiment about 7 × 104 KS → π±e∓ν decays have been reconstructed. The measured value of the charge asymmetry for this decay is AS = (−4.9 ± 5.7stat ± 2.6syst) × 10−3, which is almost twice more precise than the previous KLOE result. The combination of these two measurements gives AS = (−3.8 ± 5.0stat ± 2.6syst) × 10−3 and, together with the asymmetry of the KL semileptonic decay, provides significant tests of the CPT symmetry. The obtained results are in agreement with CPT invariance.

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Measurement of the charge asymmetry for the KS → πeν decay and test of CPT symmetry with the KLOE detector

Journal of High Energy Physics September 2018, 2018:21 | Cite as Measurement of the charge asymmetry for the KS → πeν decay and test of CPT symmetry with the KLOE detector AuthorsAuthors and affiliations The KLOE-2 collaborationA. AnastasiD. BabusciM. BerlowskiC. BloiseF. BossiP. BranchiniA. BudanoB. CaoG. CaponF. CeradiniP. CiambroneF. CurciarelloE. CzerwinskiG. D’AgostiniE. DanèV. De LeoE. De LuciaA. De SantisP. De SimoneA. Di CiccoA. Di DomenicoD. DomeniciA. D’UffiziA. FantiniG. FantiniP. FermaniS. FioreA. GajosP. GauzziS. GiovannellaE. GrazianiV. L. IvanovT. JohanssonX. KangD. Kisielewska-KaminskaE. A. KozyrevW. KrzemienA. KupsćS. LoffredoP. A. LukinG. MandaglioM. MartiniR. MessiS. MiscettiD. MoriccianiP. MoskalA. PasseriV. PateraE. Perez del RioN. RahaP. SantangeloM. SchioppaA. SelceM. SilarskiF. SirghiE. P. SolodovL. TortoraG. VenanzoniW. WislickiM. Wolke Open Access Regular Article - Experimental Physics First Online: 05 September 2018 Received: 25 June 2018 Revised: 11 August 2018 Accepted: 14 August 2018 23 Downloads Abstract Using 1.63 fb−1 of integrated luminosity collected by the KLOE experiment about 7 × 104 KS → π±e∓ν decays have been reconstructed. The measured value of the charge asymmetry for this decay is AS = (−4.9 ± 5.7stat ± 2.6syst) × 10−3, which is almost twice more precise than the previous KLOE result. The combination of these two measurements gives AS = (−3.8 ± 5.0stat ± 2.6syst) × 10−3 and, together with the asymmetry of the KL semileptonic decay, provides significant tests of the CPT symmetry. The obtained results are in agreement with CPT invariance. Keywords CP violation e+-e- Experiments Flavor physics  ArXiv ePrint: 1806.08654 Download to read the full article text Notes Open Access This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. References [1] F. Niebergall et al., Experimental study of the ΔSΔQ rule in the time dependent rate of K 0 → πeν, Phys. Lett. B 49 (1974) 103 [INSPIRE].ADSCrossRefGoogle Scholar [2] S. Bennett, D. Nygren, H. Saal, J. Steinberger and J. Sunderland, Measurement of the Charge Asymmetry in the Decay K L0 → π ± + e ∓ + ν, Phys. Rev. Lett. 19 (1967) 993 [INSPIRE].ADSCrossRefGoogle Scholar [3] KLOE collaboration, F. Ambrosino et al., |V us| and lepton universality from kaon decays with the KLOE detector, JHEP 04 (2008) 059 [arXiv:0802.3009] [INSPIRE]. [4] FlaviaNet Working Group on Kaon Decays collaboration, M. Antonelli et al., An Evaluation of |V us| and precise tests of the Standard Model from world data on leptonic and semileptonic kaon decays, Eur. Phys. J. C 69 (2010) 399 [arXiv:1005.2323] [INSPIRE]. [5] M. Hayakawa and A.I. Sanda, Searching for T, CP, CPT and ΔS = ΔQ rule violations in the neutral K meson system: A Guide, Phys. Rev. D 48 (1993) 1150 [hep-ph/9302206] [INSPIRE]. [6] L. Maiani, CP and CPT violation in neutral kaon decays, in The Second DAΦNE Physics Handbook. Volume I, L. Maiani, G. Pancheri and N. Paver eds., INFN, Frascati Italy (1995), pp. 3–26 [INSPIRE]. [7] G. Lüders, Proof of the TCP theorem, Annals Phys. 2 (1957) 1 [INSPIRE].ADSMathSciNetCrossRefzbMATHGoogle Scholar [8] N.E. Mavromatos, Decoherence and CPT Violation in a Stringy Model of Space-Time Foam, Found. Phys. 40 (2010) 917 [arXiv:0906.2712] [INSPIRE].ADSMathSciNetCrossRefzbMATHGoogle Scholar [9] S. Liberati, Tests of Lorentz invariance: a 2013 update, Class. Quant. Grav. 30 (2013) 133001 [arXiv:1304.5795] [INSPIRE].ADSMathSciNetCrossRefzbMATHGoogle Scholar [10] J. Bernabeu, A. Di Domenico and P. Villanueva-Perez, Probing CPT in transitions with entangled neutral kaons, JHEP 10 (2015) 139 [arXiv:1509.02000] [INSPIRE].ADSCrossRefGoogle Scholar [11] J.S. Bell and J. Steinberger, Weak interactions of kaons, in proceeedings of the Oxford International Conference on Elementary Particles, Oxford, U.K., 19–25 September 1965 [INSPIRE]. [12] KLOE collaboration, F. Ambrosino et al., Determination of CP and CPT violation parameters in the neutral kaon system using the Bell-Steinberger relation and data from the KLOE experiment, JHEP 12 (2006) 011 [hep-ex/0610034] [INSPIRE]. [13] Particle Data Group collaboration, C. Patrignani et al., Review of Particle Physics, Chin. Phys. C 40 (2016) 100001 [INSPIRE]. [14] KTeV collaboration, A. Alavi-Harati et al., A Measurement of the K L charge asymmetry, Phys. Rev. Lett. 88 (2002) 181601 [hep-ex/0202016] [INSPIRE]. [15] A. Di Domenico, Handbook on Neutral Kaon Interferometry at a ϕ-factory, Frascati Physics Series, volume 43, INFN, Frascati Italy (2007) [INSPIRE]. [16] A. Gallo et al., DAFNE status report, Conf. Proc. C 060626 (2006) 604 [INSPIRE].ADSGoogle Scholar [17] KLOE collaboration, F. Ambrosino et al., Study of the branching ratio and charge asymmetry for the decay K S → πeν with the (...truncated)


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The KLOE-2 collaboration, A. Anastasi, D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, G. Capon, 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, D. Domenici, A. D’Uffizi, A. Fantini, G. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V. L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kaminska, E. A. Kozyrev, W. Krzemien, A. Kupsć, S. Loffredo, P. A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, D. Moricciani, P. Moskal, A. Passeri, V. Patera, E. Perez del Rio, N. Raha, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E. P. Solodov, L. Tortora, G. Venanzoni, W. Wislicki, M. Wolke. Measurement of the charge asymmetry for the KS → πeν decay and test of CPT symmetry with the KLOE detector, Journal of High Energy Physics, 2018, pp. 21, Volume 2018, Issue 9, DOI: 10.1007/JHEP09(2018)021