Measurement of time-dependent CP violation in B 0ηK 0 decays

Abstract

We present a measurement of the time-dependent CP violation parameters in B 0ηK 0 decays. The measurement is based on the full data sample containing 772 × 106 \( B\overline{B} \) pairs collected at the Υ(4S) resonance using the Belle detector at the KEKB asymmetric-energy e + e collider. The measured values of the mixing-induced and direct CP violation parameters are:

$$ \sin\ 2{\phi}_1^{\mathrm{eff}}=+0.68\pm 0.07\pm 0.03, $$
$$ {\mathcal{A}}_{{{{}_{\eta}}_{\prime}}_{K^0}}=+0.03\pm 0.05\pm 0.04, $$

where the first uncertainty is statistical and the second is systematic. The values obtained are the most accurate to date. Furthermore, these results are consistent with our previous measurements and with the world-average value of sin 2ϕ 1 measured in B 0J/ψK 0 decays.

A preprint version of the article is available at ArXiv.

References

  1. [1]

    M. Kobayashi and T. Maskawa, CP Violation in the Renormalizable Theory of Weak Interaction, Prog. Theor. Phys. 49 (1973) 652 [INSPIRE].

    ADS  Article  Google Scholar 

  2. [2]

    Belle collaboration, K. Abe et al., Observation of large CP-violation in the neutral B meson system, Phys. Rev. Lett. 87 (2001) 091802 [hep-ex/0107061] [INSPIRE].

    Article  Google Scholar 

  3. [3]

    BaBar collaboration, B. Aubert et al., Observation of CP-violation in the B 0 meson system, Phys. Rev. Lett. 87 (2001) 091801 [hep-ex/0107013] [INSPIRE].

    ADS  Article  Google Scholar 

  4. [4]

    M.B. Gavela, P. Hernández, J. Orloff and O. Pene, Standard model CP-violation and baryon asymmetry, Mod. Phys. Lett. A 9 (1994) 795 [hep-ph/9312215] [INSPIRE].

    ADS  Article  Google Scholar 

  5. [5]

    Y. Grossman and M.P. Worah, CP asymmetries in B decays with new physics in decay amplitudes, Phys. Lett. B 395 (1997) 241 [hep-ph/9612269] [INSPIRE].

    ADS  Article  Google Scholar 

  6. [6]

    D. Atwood and A. Soni, Bη′ + X and the QCD anomaly, Phys. Lett. B 405 (1997) 150 [hep-ph/9704357] [INSPIRE].

    ADS  Article  Google Scholar 

  7. [7]

    M. Ciuchini, E. Franco, G. Martinelli, A. Masiero and L. Silvestrini, CP violating B decays in the standard model and supersymmetry, Phys. Rev. Lett. 79 (1997) 978 [hep-ph/9704274] [INSPIRE].

    ADS  Article  Google Scholar 

  8. [8]

    A.B. Carter and A.I. Sanda, CP Violation in B Meson Decays, Phys. Rev. D 23 (1981) 1567 [INSPIRE].

    ADS  Google Scholar 

  9. [9]

    I.I.Y. Bigi and A.I. Sanda, Notes on the Observability of CP-violations in B Decays, Nucl. Phys. B 193 (1981) 85 [INSPIRE].

    ADS  Article  Google Scholar 

  10. [10]

    M. Gronau, J.L. Rosner and J. Zupan, Updated bounds on CP asymmetries in B 0ηK S and B 0π 0 K S , Phys. Rev. D 74 (2006) 093003 [hep-ph/0608085] [INSPIRE].

    ADS  Google Scholar 

  11. [11]

    M. Beneke, Corrections to sin(2β) from CP asymmetries in B 0 → (π 0 , ρ 0 , η, η, ω, ϕ) K S decays, Phys. Lett. B 620 (2005) 143 [hep-ph/0505075] [INSPIRE].

    ADS  Article  Google Scholar 

  12. [12]

    A.R. Williamson and J. Zupan, Two body B decays with isosinglet final states in SCET, Phys. Rev. D 74 (2006) 014003 [Erratum ibid. D 74 (2006) 03901] [hep-ph/0601214] [INSPIRE].

  13. [13]

    H.-Y. Cheng, C.-K. Chua and A. Soni, Effects of final-state interactions on mixing-induced CP-violation in penguin-dominated B decays, Phys. Rev. D 72 (2005) 014006 [hep-ph/0502235] [INSPIRE].

    ADS  Google Scholar 

  14. [14]

    M. Beneke and M. Neubert, QCD factorization for BPP and BPV decays, Nucl. Phys. B 675 (2003) 333 [hep-ph/0308039] [INSPIRE].

    ADS  Article  Google Scholar 

  15. [15]

    M. Gronau, J.L. Rosner and J. Zupan, Correlated bounds on CP asymmetries in B 0ηK S , Phys. Lett. B 596 (2004) 107 [hep-ph/0403287] [INSPIRE].

    ADS  Article  Google Scholar 

  16. [16]

    Y. Grossman, Z. Ligeti, Y. Nir and H. Quinn, SU(3) relations and the CP asymmetries in B decays to ηK S , ϕK S , and K + K K S , Phys. Rev. D 68 (2003) 015004 [hep-ph/0303171] [INSPIRE].

    ADS  Google Scholar 

  17. [17]

    Belle collaboration, K.-F. Chen et al., Observation of time-dependent CP-violation in B 0ηK 0 decays and improved measurements of CP asymmetries in B 0ϕK 0 , K 0 S K 0 S K 0 S and B 0J/ψK 0 decays, Phys. Rev. Lett. 98 (2007) 031802 [hep-ex/0608039] [INSPIRE].

    Article  Google Scholar 

  18. [18]

    BaBar collaboration, B. Aubert et al., Measurement of time dependent CP asymmetry parameters in B 0 meson decays to ωK 0 S , η ′ K 0 S and π 0 K 0 S , Phys. Rev. D 79 (2009) 052003 [arXiv:0809.1174] [INSPIRE].

    ADS  Google Scholar 

  19. [19]

    S. Kurokawa, Overview of the KEKB accelerators, Nucl. Instrum. Meth. A 499 (2003) 1 [INSPIRE].

    ADS  Article  Google Scholar 

  20. [20]

    T. Abe et al., Achievements of KEKB, Prog. Theor. Exp. Phys. 2013 (2013) 03A001.

    Google Scholar 

  21. [21]

    Belle collaboration, A. Abashian et al., The Belle Detector, Nucl. Instrum. Meth. A 479 (2002) 117 [INSPIRE].

    Google Scholar 

  22. [22]

    Belle collaboration, J. Brodzicka et al., Physics Achievements from the Belle Experiment, PTEP 2012 (2012) 04D001 [arXiv:1212.5342] [INSPIRE].

    Google Scholar 

  23. [23]

    D.J. Lange, The EvtGen particle decay simulation package, Nucl. Instrum. Meth. A 462 (2001) 152 [INSPIRE].

    ADS  Article  Google Scholar 

  24. [24]

    R. Brun et al., GEANT 3.21, CERN DD/EE/84-01 (1984).

  25. [25]

    R.A. Fisher, The Use of Multiple Measurements in Taxonomic Problems, Annals Eugenics 7 (1936) 179.

    Article  Google Scholar 

  26. [26]

    Belle collaboration, K.F. Chen et al., Time-dependent CP-violating asymmetries in \( b\to s\overline{q}q \) transitions, Phys. Rev. D 72 (2005) 012004 [hep-ex/0504023] [INSPIRE].

    Google Scholar 

  27. [27]

    BELLE collaboration, K. Abe et al., Measurement of branching fractions for Bππ, Kπ and KK decays, Phys. Rev. Lett. 87 (2001) 101801 [hep-ex/0104030] [INSPIRE].

    Article  Google Scholar 

  28. [28]

    BELLE collaboration, I. Adachi et al., Precise measurement of the CP-violation parameter sin 2ϕ 1 in \( {B}^0\to \left(c\overline{c}\right){K}^0 \) decays, Phys. Rev. Lett. 108 (2012) 171802 [arXiv:1201.4643] [INSPIRE].

    Article  Google Scholar 

  29. [29]

    Belle collaboration, H. Kakuno et al., Neutral B flavor tagging for the measurement of mixing induced CP-violation at Belle, Nucl. Instrum. Meth. A 533 (2004) 516 [hep-ex/0403022] [INSPIRE].

    Google Scholar 

  30. [30]

    ARGUS collaboration, H. Albrecht et al., Search for Hadronic bu Decays, Phys. Lett. B 241 (1990) 278 [INSPIRE].

    ADS  Google Scholar 

  31. [31]

    H. Tajima et al., Proper time resolution function for measurement of time evolution of B mesons at the KEK B factory, Nucl. Instrum. Meth. A 533 (2004) 370 [hep-ex/0301026] [INSPIRE].

    ADS  Article  Google Scholar 

  32. [32]

    Particle Data Group collaboration, J. Beringer et al., Review of Particle Physics (RPP), Phys. Rev. D 86 (2012) 010001 [INSPIRE].

    Google Scholar 

  33. [33]

    O. Long, M. Baak, R.N. Cahn and D.P. Kirkby, Impact of tag side interference on time dependent CP asymmetry measurements using coherent \( {B}^0-{\overline{B}}^0 \) pairs, Phys. Rev. D 68 (2003) 034010 [hep-ex/0303030] [INSPIRE].

    ADS  Google Scholar 

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Correspondence to L. Šantelj.

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ArXiv ePrint: 1408.5991

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The BELLE collaboration., Šantelj, L., Yusa, Y. et al. Measurement of time-dependent CP violation in B 0ηK 0 decays. J. High Energ. Phys. 2014, 165 (2014). https://doi.org/10.1007/JHEP10(2014)165

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Keywords

  • CP violation
  • CKM angle beta
  • e+-e- Experiments
  • B physics