Journal of High Energy Physics (Sep 2018)

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

  • 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

DOI
https://doi.org/10.1007/JHEP09(2018)021
Journal volume & issue
Vol. 2018, no. 9
pp. 1 – 17

Abstract

Read online

Abstract Using 1.63 fb−1 of integrated luminosity collected by the KLOE experiment about 7 × 104 K S → π ± e ∓ ν decays have been reconstructed. The measured value of the charge asymmetry for this decay is A S = (−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 A S = (−3.8 ± 5.0stat ± 2.6syst) × 10−3 and, together with the asymmetry of the K L semileptonic decay, provides significant tests of the CPT symmetry. The obtained results are in agreement with CPT invariance.

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