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Observation of ${\overline{B}}_{(s)}^{0}$\rightarrow${}J/$\psi${}$ ${f}_{1}(1285)$ decays and measurement of the ${f}_{1}(1285)$ mixing angle


LHCb Collaboration; Bernet, R; Müller, K; Steinkamp, O; Straumann, U; Vollhardt, A; et al (2014). Observation of ${\overline{B}}_{(s)}^{0}$\rightarrow${}J/$\psi${}$ ${f}_{1}(1285)$ decays and measurement of the ${f}_{1}(1285)$ mixing angle. Physical Review Letters, 112(091802):online.

Abstract

Decays of ${\overline{B}}_{s}^{0}$ and ${\overline{B}}^{0}$ mesons into $J/$\psi${}$ ${$\pi${}}^{+}$${$\pi${}}^{$-${}}$${$\pi${}}^{+}$${$\pi${}}^{$-${}}$ final states, produced in $pp$ collisions at the LHC, are investigated using data corresponding to an integrated luminosity of $3\text{ }\text{ }\mathrm{fb}{}^{$-${}1}$ collected with the LHCb detector. ${\overline{B}}_{(s)}^{0}$\rightarrow${}J/$\psi${}{f}_{1}(1285)$ decays are seen for the first time, and the branching fractions are measured. Using these rates, the ${f}_{1}(1285)$ mixing angle between strange and nonstrange components of its wave function in the $q\overline{q}$ structure model is determined to be $\pm{}(24.{0}_{$-${}2.6$-${}0.8}^{+3.1+0.6})$. Implications on the possible tetraquark nature of the ${f}_{1}(1285)$ are discussed.

Abstract

Decays of ${\overline{B}}_{s}^{0}$ and ${\overline{B}}^{0}$ mesons into $J/$\psi${}$ ${$\pi${}}^{+}$${$\pi${}}^{$-${}}$${$\pi${}}^{+}$${$\pi${}}^{$-${}}$ final states, produced in $pp$ collisions at the LHC, are investigated using data corresponding to an integrated luminosity of $3\text{ }\text{ }\mathrm{fb}{}^{$-${}1}$ collected with the LHCb detector. ${\overline{B}}_{(s)}^{0}$\rightarrow${}J/$\psi${}{f}_{1}(1285)$ decays are seen for the first time, and the branching fractions are measured. Using these rates, the ${f}_{1}(1285)$ mixing angle between strange and nonstrange components of its wave function in the $q\overline{q}$ structure model is determined to be $\pm{}(24.{0}_{$-${}2.6$-${}0.8}^{+3.1+0.6})$. Implications on the possible tetraquark nature of the ${f}_{1}(1285)$ are discussed.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2014
Deposited On:24 Feb 2015 15:16
Last Modified:08 Dec 2017 11:53
Publisher:American Physical Society
ISSN:0031-9007
Publisher DOI:https://doi.org/10.1103/PhysRevLett.112.091802

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