Measurements of ψ(2<i>S</i>) and <i>X</i>(3872) → <i>J/</i>ψπ <SUP>+</SUP> π <SUP>-</SUP> production in <i>pp</i> collisions at √<i>s</i>=8 Tev with the ATLAS detector



Aaboud, M, Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Abeloos, B, Aben, R, AbouZeid, OS, Abraham, NL, Abramowicz, H
et al (show 2850 more authors) (2017) Measurements of ψ(2<i>S</i>) and <i>X</i>(3872) → <i>J/</i>ψπ <SUP>+</SUP> π <SUP>-</SUP> production in <i>pp</i> collisions at √<i>s</i>=8 Tev with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 2017 (1). 117-.

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Abstract

Differential cross sections are presented for the prompt and non-prompt production of the hidden-charm states $X(3872)$ and $\psi(2S)$, in the decay mode $J/\psi \pi^+\pi^-$, measured using 11.4 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 8$ TeV by the ATLAS detector at the LHC. The ratio of cross-sections $X(3872)/\psi(2S)$ is also given, separately for prompt and non-prompt components, as well as the non-prompt fractions of $X(3872)$ and $\psi(2S)$. Assuming independent single effective lifetimes for non-prompt $X(3872)$ and $\psi(2S)$ production gives $R_B = \frac{\mathcal{B}(B \rightarrow X(3872)\textrm{ + any}) \mathcal{B}(X(3872 \rightarrow J/\psi\pi^+\pi^-)}{\mathcal{B}(B \rightarrow \psi(2S)\textrm{ + any}) \mathcal{B}(\psi(2S) \rightarrow J/\psi\pi^+\pi^-)} = (3.95 \pm 0.32 \mathrm{(stat)} \pm 0.08\mathrm{(sys)}) \times 10^{-2}$, while separating short- and long-lived contributions, assuming that the short-lived component is due to $B_c$ decays, gives $R_B = (3.57 \pm 0.33\mathrm{(stat)} \pm 0.11\mathrm{(sys)}) \times 10^{-2}$, with the fraction of non-prompt $X(3872)$ produced via $B_c$ decays for $p_\mathrm{T}(X(3872)) > 10$ GeV being $(25 \pm 13\mathrm{(stat)} \pm 2\mathrm{(sys)} \pm 5\mathrm{(spin)})\%$. The distributions of the dipion invariant mass in the $X(3872)$ and $\psi(2S)$ decays are also measured and compared to theoretical predictions.

Item Type: Article
Additional Information: 42 pages in total, author list starting page 26, 10 figures, 8 tables. Submitted to JHEP. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2015-03/
Uncontrolled Keywords: B physics, Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 16 Mar 2017 11:21
Last Modified: 18 Mar 2024 04:08
DOI: 10.1007/JHEP01(2017)117
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006439