Observation of the B$$^0_\mathrm{s}\to $$X(3872)$$\phi$$ decay
Using a data sample of proton-proton collisions at $$\sqrt{s} =$$ 13 TeV, corresponding to an integrated luminosity of 140 fb$$^{-1}$$ collected by the CMS experiment in 2016-2018, the B$$^0_\mathrm{s}$$ $$\to$$ X(3872)$$\phi$$ decay is observed. Decays into J/$$\psi\,\pi^+\pi^-$$ and K$^+$$K$$^-$ are used to reconstruct, respectively, the X(3872) and $$\phi$$. The ratio of the product of branching fractions $$\mathcal{B}($$B$$^0_\mathrm{s}$$ $$\to$$ X(3872)$$\phi)\,\mathcal{B}($$X(3872) $$\to$$ J$$/\psi\,\pi^+\pi^-)$$ to the product $$\mathcal{B}($$B$$^0_\mathrm{s}$$ $$\to$$ $$\psi$$(2S)$$\phi)\,\mathcal{B}(\psi$$(2S) $$\to$$ J/$$\psi\,\pi^+\pi^-)$$ is measured to be (2.21 $$\pm$$ 0.29 (stat) $$\pm$$ 0.17 (syst))%. The ratio $$\mathcal{B}($$B$$^0_\mathrm{s}$$ $$\to$$ X(3872)$$\phi) / \mathcal{B}($$B$$^{0}$$ $$\to$$ X(3872)K$^0)$ is found to be consistent with one, while the ratio $$\mathcal{B}($$B$$^0_\mathrm{s}$$ $$\to$$ X(3872)$$\phi) / \mathcal{B}($$B$$^+$ $$\to$$ X(3872)K$^+)$ is two times smaller. This suggests a difference in the production dynamics of the X(3872) in B$^0$ and B$$^0_\mathrm{s}$$ meson decays compared to B$^+$. The reported observation may shed new light on the nature of the X(3872) particle.
- Research Organization:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Science Foundation (NSF); Kavli Foundation; Nvidia Corporation; SuperMicro Corporation; Welch Foundation; Weston Havens Foundation
- Contributing Organization:
- CMS Collaboration
- Grant/Contract Number:
- AC02-07CH11359; C-1845; SC0010005
- OSTI ID:
- 1630721
- Alternate ID(s):
- OSTI ID: 1721765
- Report Number(s):
- FERMILAB-PUB-20-212-CMS; arXiv:2005.04764; CMS-BPH-17-005; CERN-EP-2020-070; oai:inspirehep.net:1795066; TRN: US2200688
- Journal Information:
- Physical Review Letters, Vol. 125, Issue 15; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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