Study of B+c → χcπ+ decays

• A study of Bc+ → χc πi+ decays is reported using proton-proton collision data, collected with the LHCb detector at centre-of-mass energies of 7, 8, and 13TeV, corresponding to an integrated luminosity of 9 fb-1. The decay Bc+ → χc2π+ is observed for the first time, with a significance exceeding seven standard deviations. The relative branching fraction with respect to the Bc+ → J/ψ π+ decay is measured to be(ßBc+ → χc2 π+) / (ßBc+ → J/ψπ+) = 0.37 ± 0.06 ± 0.02 ± 0.01,where the first uncertainty is statistical, the second is systematic, and the third is due to the knowledge of the χc2 → J/ψγ branching fraction. No significant Bc+ → χc1π+ signal is observed and an upper limit for the relative branching fraction for the Bc+ → χc1π+ and Bc+ → χc2π+ decays of(ßBc+ →χ c1 π+) / (ßBc+ → χc2π+) ≤ 0.49is set at the 90% confidence level.

Ämnesord

NATURVETENSKAP  -- Fysik -- Subatomär fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Subatomic Physics (hsv//eng)

Nyckelord

B Physics

Branching fraction

Hadron-Hadron Scattering

B Physics

Branching fraction

Hadron-Hadron Scattering

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