Observation of orbitally excited B mesons

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1995) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 345, n° 4, p. 598-608 (1995)

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Experimental evidence for the existence of orbitally excited B meson states is presented in an analysis of the Bπ and B∗π distribution of View the MathML source using Z0 decay data taken with the DELPHI detector at LEP. The mean Q-value of the decays B∗∗ → B(∗)π is measured to be 284 ± 5 (stat.) ± 15 (syst.) MeV/c2, and the Gaussian width of the signal is 79 ± 5 (stat.) ± 8 (syst.) MeV/c2. This signal can be described as a single resonance of mass m = 5732 ± 5 (stat.) ± 20 (syst.) MeV/c2 and full width Γ = 145 ± 28 MeV/c2. The observed shape is also consistent with the production of several broad and narrow states as predicted by the quark model and partly observed in the D-meson sector. The production rate of B∗∗ per b-jet is found to be 0.27 ± 0.02 (stat.) ± 0.06 (syst.).
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1995). Observation of orbitally excited B mesons. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 345(4), 598-608. https://doi.org/10.1016/0370-2693(94)01696-A (Original work published 1995)