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Search for the decay $B_s^0 \to D^{*\mp} \pi^\pm$

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Abstract

A search for the decay Bs -> D*-+ \pi+- is presented using a data sample corresponding to an integrated luminosity of 1.0 fb-1 of pp collisions collected by LHCb. This decay is expected to be mediated by a W-exchange diagram, with little contribution from rescattering processes, and therefore a measurement of the branching fraction will help to understand the mechanism behind related decays such as Bs -> \pi+ \pi- and Bs -> D Dbar. Systematic uncertainties are minimised by using B0 -> D*-+ \pi+- as a normalisation channel. We find no evidence for a signal, and set an upper limit on the branching fraction of BR(Bs -> D*-+ \pi+-) < 6.1 (7.8) x10^(-6) at 90% (95%) confidence level.

Figures and captions

Decay diagrams for (a) $ B ^0_ s \rightarrow D^{(*)+}D^{(*)-}$ via weak exchange, (b) $ B ^0_ s \rightarrow D^{(*)+}D^{(*)-}$ via penguin annihilation, (c) $ B ^0_ s \rightarrow D^{(*)-}\pi ^+ $ via weak exchange.

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Simultaneous fit to the full data sample in five bins of $\theta_{\rm bach}$: (a) 0--0.046, (b) 0.046--0.067, (c) 0.067--0.092, (d) 0.092--0.128 and (e) 0.128--0.4 $\rm \,rad$ . Note the $y$-axis scale is logarithmic and is the same for each bin. Data points are shown in black, the full PDF as a solid blue line and the component PDFs as: (red dot-dashed) partially reconstructed background, (magenta dashed) combinatorial background, (blue dashed) $ B ^0$ signal, (black dot-dashed) $ B ^0_ s $ signal and (green 3 dot-dashed) $ B ^0 \rightarrow D ^{*-} K ^+ $ background.

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Animated gif made out of all figures.

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Tables and captions

Systematic uncertainties on ${\cal B}( B ^0_ s \rightarrow D ^{*\mp} \pi ^\pm )$.

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Table_1.pdf

Created on 09 December 2018.Citation count from INSPIRE on 09 December 2018.