Distributions of the (left) ${ J \mskip -3mu/\mskip -2mu\psi } \pi ^+ \pi ^+ \pi ^- \pi ^-$ and (right) ${ J \mskip -3mu/\mskip -2mu\psi } \pi ^+ \pi ^-$ mass of selected (top) $B ^0_ s \rightarrow \psi {(2 S )} \pi ^+ \pi ^-$ and (bottom) $B ^0_ s \rightarrow \chi _{ c 1} (3872)\pi ^+ \pi ^-$ candidates. Projections from the fit, described in the text, are overlaid. The ${ J \mskip -3mu/\mskip -2mu\psi } \pi ^+ \pi ^+ \pi ^- \pi ^-$ mass distributions are shown for the $B ^0_ s \rightarrow \psi {(2 S )} \pi ^+ \pi ^-$ and $B ^0_ s \rightarrow \chi _{ c 1} (3872)\pi ^+ \pi ^-$ candidates within narrow ${ J \mskip -3mu/\mskip -2mu\psi } \pi ^+ \pi ^-$ mass ranges, $3.679<m_{ { J \mskip -3mu/\mskip -2mu\psi } \pi ^+ \pi ^- }<3.693\text{ Ge V /}c^2$ and $3.864<m_{ { J \mskip -3mu/\mskip -2mu\psi } \pi ^+ \pi ^- }<3.880\text{ Ge V /}c^2$, respectively. The ${ J \mskip -3mu/\mskip -2mu\psi } \pi ^+ \pi ^-$ mass distributions are shown for the $B ^0_ s$ candidates within a narrow ${ J \mskip -3mu/\mskip -2mu\psi } \pi ^+ \pi ^+ \pi ^- \pi ^-$ mass range, $5.35<m_{ { J \mskip -3mu/\mskip -2mu\psi } \pi ^+ \pi ^+ \pi ^- \pi ^- }<5.38\text{ Ge V /}c^2$.

The background-subtracted mass spectra for the dipion system recoiling against the $\chi _{ c 1} (3872)$ or $\psi {(2 S )}$ states for (left) $B ^0_ s \rightarrow \psi {(2 S )} \pi ^+ \pi ^-$ and (right) $B ^0_ s \rightarrow \chi _{ c 1} (3872)\pi ^+ \pi ^-$ decays. The results of the fit, described in the text, are overlaid.

Animated gif made out of all figures.

Signal yields, hadron masses, and detector resolution scale factors from the simultaneous fit described in the text. The parameters $m_{ B ^0_ s }$, $s_{ B ^0_ s }$ and $s_{ { J \mskip -3mu/\mskip -2mu\psi } \pi ^+ \pi ^- }$ are shared in the fit among the two mass ranges. The uncertainties are statistical only.

Relative systematic uncertainties (in %) for the ratio of branching fractions. The sources are described in the text.