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* --> B gamma and 1944 +/- 108 +/- 161 B-u**,B-d** mesons decaying into a B meson and a charged pion are reconstructed. Here and in the following B-u**,B-d** denotes the eight L = 1 (b (u) over bar) and (b (d) over bar) states and their charge conjugate. For the well established B* meson the following quantities are obtained: Delta M = M(B)* - M(B) = (45.30 +/- 0.35 +/- 0.87) MeV/c(2) 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 sigma(L)/(sigma(L) + sigma(T)) = (33 +/- 6 +/- 5)%. In the M(B pi)- M(B) mass difference resonance structure is observed at (424 +/- 4 +/- 10) MeV/c(2), for which the shape and position is consistent with the expectation for B-u**,B-d** states decaying into B(*)pi(+/-). The relative production rate is determined to be BR(Z -> b -> B-u**,B-d**)/BR(Z --> b --> B-u,B-d) = [27.9 +/- 1.6(stat) +/- 5.9(syst) (+3.9)(-5.6)(model)]%. where the third error reflects the uncertainty due to different production and decay models for the broad B-u**,B-d** States.

D., B., D., C., I., D., D., D., P., G., C., G., 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

CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1996-01-01

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* --> B gamma and 1944 +/- 108 +/- 161 B-u**,B-d** mesons decaying into a B meson and a charged pion are reconstructed. Here and in the following B-u**,B-d** denotes the eight L = 1 (b (u) over bar) and (b (d) over bar) states and their charge conjugate. For the well established B* meson the following quantities are obtained: Delta M = M(B)* - M(B) = (45.30 +/- 0.35 +/- 0.87) MeV/c(2) 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 sigma(L)/(sigma(L) + sigma(T)) = (33 +/- 6 +/- 5)%. In the M(B pi)- M(B) mass difference resonance structure is observed at (424 +/- 4 +/- 10) MeV/c(2), for which the shape and position is consistent with the expectation for B-u**,B-d** states decaying into B(*)pi(+/-). The relative production rate is determined to be BR(Z -> b -> B-u**,B-d**)/BR(Z --> b --> B-u,B-d) = [27.9 +/- 1.6(stat) +/- 5.9(syst) (+3.9)(-5.6)(model)]%. where the third error reflects the uncertainty due to different production and decay models for the broad B-u**,B-d** States.
1996
D., B., D., C., I., D., D., D., P., G., C., G., 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/11365/38308
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