Please use this identifier to cite or link to this item:
http://hdl.handle.net/2445/186477
Title: | Study of charmonium production in b -hadron decays and first evidence for the decay Bs0 |
Author: | Camboni, Alessandro Coquereau, S. Fernandez, G. Garrido Beltrán, Lluís Gascon, D. Graciani Diaz, Riardo Graugés Pous, Eugeni Marin Benito, Carla Picatoste Olloqui, E. Rives Molina, V. Sanchez Gonzalo, D. Alfonso Albero, Alejandro Calvo Gomez, M. Gironella Gironell, P. Vazquez Gomez, R. LHCb Collaboration |
Keywords: | Hadrons Gran Col·lisionador d'Hadrons Física de partícules Experiments Hadrons Large Hadron Collider (France and Switzerland) Particle physics Experiments |
Issue Date: | Sep-2017 |
Publisher: | Società Italiana di Fisica & Springer Verlag |
Abstract: | Using decays to φ -meson pairs, the inclusive production of charmonium states in {b} -hadron decays is studied with pp collision data corresponding to an integrated luminosity of 3.0 { fb}^{-1} , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. Denoting by B_C ≡ B (b → CX) × B (C→ φφ) the inclusive branching fraction of a {{b}} hadron to a charmonium state C that decays into a pair of φ mesons, ratios R^{C_1}_{C_2}≡ B_{C_1} / B_{C_2} are determined as R^{χ_{c} 0}_{{η _{{c}}} (1S)} = 0.147 ± 0.023 ± 0.011, R^{χ_{c} 1}_{{η _{{c}}} (1S)} = 0.073 ± 0.016 ± 0.006, R^{χ_{c} 2}_{η _{c} (1S)} = 0.081 ± 0.013 ± 0.005, R^{χ_{c} 1}_{χ_{c} 0} = 0.50 ± 0.11 ± 0.01, R^{χ_{c} 2}_{χ_{c} 0} = 0.56 ± 0.10 ± 0.01 and R^{{η _{{c}}} (2S)}_{{η _{{c}}} (1S)} = 0.040 ± 0.011 ± 0.004. Here and below the first uncertainties are statistical and the second systematic. Upper limits at 90% confidence level for the inclusive production of X(3872), X(3915) and χ_{c} 2} (2P) states are obtained as R^{X(3872)}_{χ_{c} 1} < 0.34, R^{X(3915)}_{χ_{c} 0} < 0.12 and R^{χ_{c} 2} (2P)}_{χ_{c} 2} < 0.16. Differential cross-sections as a function of transverse momentum are measured for the {η _{{c}}} (1S) and χ _c states. The branching fraction of the decay B ^0_{s} → φ φ φ is measured for the first time, B ( B^0_{s} → φφφ) = (2.15 ± 0.54 ± 0.28 ± 0.21_{B}) × 10^{-6}. Here the third uncertainty is due to the branching fraction of the decay B^0_{s} → φ φ , which is used for normalization. No evidence for intermediate resonances is seen. A preferentially transverse φ polarization is observed. The measurements allow the determination of the ratio of the branching fractions for the {η _{{c}}} (1S) decays to φ φ and p {\overline{p}} as B( η_{c} (1S)→ φφ)/B(η_{c} (1S)→ p {\overline{p}} ) = 1.79 ± 0.14± 0.32. |
Note: | Reproducció del document publicat a: https://doi.org/10.1140/epjc/s10052-017-5151-8 |
It is part of: | European Physical Journal C, 2017, vol. 77, num. 609, p. 1-18 |
URI: | http://hdl.handle.net/2445/186477 |
Related resource: | https://doi.org/10.1140/epjc/s10052-017-5151-8 |
ISSN: | 1434-6044 |
Appears in Collections: | Articles publicats en revistes (Física Quàntica i Astrofísica) |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
678013.pdf | 202.19 kB | Adobe PDF | View/Open |
This item is licensed under a
Creative Commons License