A data sample of about 3.0 million hadronic Z decays collected by the ALEPH experiment at LEP in the years 1991 through 1994 is used to make an inclusive selection of B hadron events. In this event sample 4227±140±252 B* mesons in the decay B*→Bγ and 1944±108±161 B** u,d mesons decaying into a B meson and a charged pion are reconstructed. Here and in the following B** u,d denotes the eight L=1(bū) and (bd) states and their charge conjugate. For the well established B* meson the following quantities are obtained:ΔM=M B*-MB=(45.30±0.35±0.87) MeV/c2 and N B*/(N B+N B*)=(77.1±2.6±7.0)%. The angular distribution of the photons in the B* rest frame is used to measure the relative contribution of longitudinal B* polarization states to be σ L/(σ L+σ T)=(33±6±5)%. In the M(Bπ)-M(B) mass difference resonance structure is observed at (424±4±10) MeV/c2, for which the shape and position is consistent with the expectation for B** u,d states decaying into B(*)π ±. The relative production rate is determined to be {Mathematical expression} where the third error reflects the uncertainty due to different production and decay models for the broad B** u,d states.

Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., et al. (1996). Production of excited beauty states in Z decays. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 69(3), 393-404 [10.1007/BF02907419].

Production of excited beauty states in Z decays

CARPINELLI, Massimo;
1996

Abstract

A data sample of about 3.0 million hadronic Z decays collected by the ALEPH experiment at LEP in the years 1991 through 1994 is used to make an inclusive selection of B hadron events. In this event sample 4227±140±252 B* mesons in the decay B*→Bγ and 1944±108±161 B** u,d mesons decaying into a B meson and a charged pion are reconstructed. Here and in the following B** u,d denotes the eight L=1(bū) and (bd) states and their charge conjugate. For the well established B* meson the following quantities are obtained:ΔM=M B*-MB=(45.30±0.35±0.87) MeV/c2 and N B*/(N B+N B*)=(77.1±2.6±7.0)%. The angular distribution of the photons in the B* rest frame is used to measure the relative contribution of longitudinal B* polarization states to be σ L/(σ L+σ T)=(33±6±5)%. In the M(Bπ)-M(B) mass difference resonance structure is observed at (424±4±10) MeV/c2, for which the shape and position is consistent with the expectation for B** u,d states decaying into B(*)π ±. The relative production rate is determined to be {Mathematical expression} where the third error reflects the uncertainty due to different production and decay models for the broad B** u,d states.
Articolo in rivista - Articolo scientifico
Physics
English
393
404
12
Buskulic, D., Casper, D., Debonis, I., Decamp, D., Ghez, P., Goy, C., et al. (1996). Production of excited beauty states in Z decays. ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS, 69(3), 393-404 [10.1007/BF02907419].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390221
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