Measurement of the properties of the <i>I</i> <i><sub>b</sub></i> <SUP>au 0</SUP> baryon

Aaij, R, Abellan Beteta, C, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S
et al (show 724 more authors) (2016) Measurement of the properties of the <i>I</i> <i><sub>b</sub></i> <SUP>au 0</SUP> baryon. JOURNAL OF HIGH ENERGY PHYSICS, 1605 (5). 161-.

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We perform a search for near-threshold $\Xi_b^0$ resonances decaying to $\Xi_b^- \pi^+$ in a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb$^{-1}$ collected by the LHCb experiment. We observe one resonant state, with the following properties: \begin{eqnarray*} m(\Xi_b^{*0}) - m(\Xi_b^-) - m(\pi^+) &=& 15.727 \pm 0.068 \, (\mathrm{stat}) \pm 0.023 \, (\mathrm{syst}) \, \mathrm{MeV}/c^2, \Gamma(\Xi_b^{*0}) &=& 0.90 \pm 0.16 \, (\mathrm{stat}) \pm 0.08 \, (\mathrm{syst}) \, \mathrm{MeV} . \end{eqnarray*} This confirms the previous observation by the CMS collaboration. The state is consistent with the $J^P=3/2^+$ $\Xi_b^{*0}$ resonance expected in the quark model. This is the most precise determination of the mass and the first measurement of the natural width of this state. We have also measured the ratio \begin{align*} \frac{\sigma(pp \to \Xi_b^{*0} X){\cal{B}}(\Xi_b^{*0} \to \Xi_b^- \pi^+)}{\sigma(pp \to \Xi_b^- X)} = 0.28 \pm 0.03 \, (\mathrm{stat}) \pm 0.01 \, (\mathrm{syst}) . \end{align*}

Item Type: Article
Additional Information: 19 pages, 5 figures. All figures and tables, along with any supplementary material and additional information, are available at
Uncontrolled Keywords: Spectroscopy, B physics, Particle and resonance production, Hadron-Hadron scattering (experiments)
Depositing User: Symplectic Admin
Date Deposited: 01 Jul 2016 14:51
Last Modified: 05 Oct 2023 11:27
DOI: 10.1007/JHEP05(2016)161
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