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<p>The LHCb collaboration has recently measured the CP asymmetry in <i>B</i><sup>+</sup> → <i>J/ψπ</i><sup>+</sup> decay, while the Belle II collaboration has recently measured the CP asymmetries in <i>B</i><sup>0</sup> → <i>J/ψπ</i><sup>0</sup> decay. Within the Standard Model, and using flavor-SU(3) relations including first-order breaking corrections, these measurements lead to new predictions with regard to CP violation in <i>B</i><sup>+</sup> <i>→ J/ψK</i><sup>+</sup> and <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\({B}_{s}\to J/\psi {\overline{K} }^{0}\)</EquationSource> </InlineEquation> decays, the difference between <InlineEquation ID="IEq2"> <EquationSource Format="TEX">\({S}_{\psi {K}_{S}}\)</EquationSource> </InlineEquation> and sin 2<i>β</i>, and the rate and CP asymmetries in <i>B</i><sub><i>s</i></sub><i> → J/ψπ</i><sup>0</sup> decay.</p>

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Lessons from LHCb and Belle II measurements of B → J/ψπ and B → J/ψK decays

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年1月15日

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  • Zoltan Ligeti,
  • Yosef Nir,
  • Roy Schein

摘要

The LHCb collaboration has recently measured the CP asymmetry in B+ → J/ψπ+ decay, while the Belle II collaboration has recently measured the CP asymmetries in B0 → J/ψπ0 decay. Within the Standard Model, and using flavor-SU(3) relations including first-order breaking corrections, these measurements lead to new predictions with regard to CP violation in B+ → J/ψK+ and \({B}_{s}\to J/\psi {\overline{K} }^{0}\) decays, the difference between \({S}_{\psi {K}_{S}}\) and sin 2β, and the rate and CP asymmetries in Bs → J/ψπ0 decay.