Measurements of the S-wave fraction in B0K+πμ+μ decays and the B0K(892)0μ+μ differential branching fraction

The LHCb Collaboration

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A measurement of the differential branching fraction of the decay B0K(892)0μ+μ is presented together with a determination of the S-wave fraction of the K+π system in the decay B0K+πμ+μ. The analysis is based on pp-collision data corresponding to an integrated luminosity of 3 fb−1 collected with the LHCb experiment. The measurements are made in bins of the invariant mass squared of the dimuon system, q2. Precise theoretical predictions for the differential branching fraction of B0K(892)0μ+μ decays are available for the q2 region 1.1 < q2< 6.0 GeV2/c4. In this q2 region, for the K+π invariant mass range 796 < m< 996 MeV/c2, the S-wave fraction of the K+π system in B0K+πμ+μ decays is found to be FS=0.101±0.017(stat)±0.009(syst), and the differential branching fraction of B0K(892)0μ+μ decays is determined to be dB/dq2=(0.392+0.020−0.019(stat)±0.010(syst)±0.027(norm))×10−7c4/GeV2.The differential branching fraction measurements presented are the most precise to date and are found to be in agreement with Standard Model predictions.
Original languageEnglish
Article number47
Number of pages30
JournalJournal of High Energy Physics
Early online date8 Nov 2016
Publication statusPublished - 8 Nov 2016


  • B physics
  • Hadron-Hadron scattering (experiments)
  • Rare decay


Dive into the research topics of 'Measurements of the S-wave fraction in <em class="EmphasisTypeItalic">B</em><sup>0</sup> → <em class="EmphasisTypeItalic">K</em><sup>+</sup><em class="EmphasisTypeItalic">π</em><sup>−</sup><em class="EmphasisTypeItalic">μ</em><sup>+</sup><em class="EmphasisTypeItalic">μ</em><sup>−</sup> decays and the <em class="EmphasisTypeItalic">B</em><sup>0</sup> → <em class="EmphasisTypeItalic">K</em><sup>∗</sup>(892)<sup>0</sup><em class="EmphasisTypeItalic">μ</em><sup>+</sup><em class="EmphasisTypeItalic">μ</em><sup>−</sup> differential branching fraction'. Together they form a unique fingerprint.

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