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- W2912304299 abstract "A Dalitz plot analysis of $${{B} ^0} !rightarrow eta _c(1S) {{K} ^+} {{pi } ^-} $$ decays is performed using data samples of pp collisions collected with the $$text{ LHCb } $$ detector at centre-of-mass energies of $${sqrt{s}} =7,~8$$ and $$13{,mathrm {Te}mathrm {V}} $$ , corresponding to a total integrated luminosity of $$4.7 ,text{ fb }^{-1} $$ . A satisfactory description of the data is obtained when including a contribution representing an exotic $$eta _c(1S) pi ^-$$ resonant state. The significance of this exotic resonance is more than three standard deviations, while its mass and width are $$4096 pm 20~^{+18}_{-22} ,mathrm {Me}mathrm {V} $$ and $$152 pm 58~^{+60}_{-35} ,mathrm {Me}mathrm {V} $$ , respectively. The spin-parity assignments $$J^P=0^+$$ and $$J^{P}=1^-$$ are both consistent with the data. In addition, the first measurement of the $${{B} ^0} !rightarrow eta _c(1S) {{K} ^+} {{pi } ^-} $$ branching fraction is performed and gives $$begin{aligned} displaystyle mathcal {B}({{B} ^0} !rightarrow eta _c(1S) {{K} ^+} {{pi } ^-} ) = (5.73 pm 0.24 pm 0.13 pm 0.66) times 10^{-4}, end{aligned}$$ where the first uncertainty is statistical, the second systematic, and the third is due to limited knowledge of external branching fractions." @default.
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