Observation of the $B^0_s\rightarrow \chi_{c1}(3872)\pi^+\pi^-$ decay

TL;DR

This paper reports the first observation of the decay $B^0_s ightarrow ext{chi}_{c1}(3872) ightarrow J/ ext{psi}\pi^+\pi^-$ using LHCb data, measuring its branching ratio relative to a similar decay and analyzing the $ ext{pi}^+ ext{pi}^-$ mass spectrum.

Contribution

It presents the first observation and measurement of the branching ratio of the $B^0_s$ decay involving $ ext{chi}_{c1}(3872)$, expanding understanding of $B_s$ decay modes.

Findings

Measured the ratio of branching fractions to be approximately 6.8%

Observed a significant contribution from $f_0(980)$ in the $ ext{pi}^+ ext{pi}^-$ spectrum

Provided new data on $B_s$ decay channels involving exotic charmonium states

Abstract

The first observation of the $B^0_s \rightarrow \left( \chi_{c1}(3872) \rightarrow J/\psi\pi^+\pi^-\right) \pi^+ \pi^-$ decay is reported using proton-proton collision data, corresponding to integrated luminosities of 1, 2 and 6fb$^{-1}$, collected by the LHCb experiment at centre-of-mass energies of 7, 8 and 13TeV, respectively. The ratio of branching fractions relative to the $B^0_s \rightarrow \left( \psi(2S) \rightarrow J\psi\pi^+\pi^- \right) \pi^+ \pi^-$ decay is measured to be $$ \frac{ \mathcal{B} \left( B^0_s \rightarrow \chi_{c1}(3872) \pi^+\pi^-\right) \times \mathcal{B} \left( \chi_{c1}(3872) \rightarrow J\psi\pi^+\pi^-\right)} { \mathcal{B} \left( B^0_s \rightarrow \psi(2S) \pi^+ \pi^- \right) \times \mathcal{B} \left( \psi(2S) \rightarrow J\psi\pi^+\pi^-\right) } = \left( 6.8 \pm 1.1 \pm 0.2 \right) \times 10^{-2} , $$ where the first uncertainty is statistical and the second systematic. The mass spectrum of the $\pi^+\pi^-$ system recoiling against the $\chi_{c1}(3872)$ meson exhibits a large contribution from $B^0_s \rightarrow \chi_{c1}(3872) \left( f_0(980) \rightarrow \pi^+ \pi^-\right)$ decays.