Measurements of $\psi (2S)$ and $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}$ production in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector

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 $R_B=\frac{\mathcal{B}(B\to X(3872)\text{ + any})\mathcal{B}(X(3872\to J/\psi {\pi }^{+}{\pi }^{-})}{\mathcal{B}(B\to \psi (2S)\text{ + any})\mathcal{B}(\psi (2S)\to J/\psi {\pi }^{+}{\pi }^{-})}=(3.95\pm 0.32(\mathrm{stat})\pm 0.08(\mathrm{sys}))\times 10^{-2}$, 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.

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/

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Cited by in corpus (39)

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• Measurement of ${\chi }_{c1}(3872)$ production in proton-proton collisions at $\sqrt{s}=8$ and $13$ TeV
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• Observation of a New $X(3872)$ Production Process $e^{+}{e}^{-}\to \omega X(3872)$
• Fragmentation functions for axial-vector heavy tetraquarks: A TQ4Q1.1 update
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• Observation of the B${}_{\mathrm{s}}^0$ $\to$ X(3872)$\varphi$ decay
• Study of charmonium and charmonium-like contributions in $B^{+}\to J/\psi \eta K^{+}$ decays
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• Excitation function of initial temperature of heavy flavor quarkonium emission source in high energy collisions
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• Study of $e^{+}{e}^{-}\to \omega X(3872)$ and $\gamma X(3872)$ from 4.66 to 4.95 GeV
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• Studies of $X(3872)$ and $\psi (2S)$ production in $p\bar{p}$ collisions at 1.96 TeV
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• Cross sections of inclusive $\psi (2S)$ and $X(3872)$ production from $b$-hadron decays in $pp$ collisions and comparison with ATLAS and CMS data
• Search for the light hadron decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}\eta$
• Multimodal Fragmentation of All-Heavy Pentaquarks: Uncertainty-Aware Predictions for Hadron Colliders
• All-charm tetraquarks at hadron colliders: A high-precision fragmentation perspective
• Can Transverse Mass Scaling Shed Light on the Event-Activity Dependence of ${\rm Y}$ Mesons Production at LHC?
• Study of conventional and non-conventional scalar and vector mesons
• Latest D0 results on exotic hadrons produced in $p\bar{p}$ collisions
• ATLAS results on hadron spectroscopy, including exotic states