In 160 000 hadronic Z decays recorded with the ALEPH detector at LEP, the yields of Λℓ- and Λℓ+ combinations have been measured. The observed excess of Λℓ- over Λℓ+ of 53±13 is interpreted as evidence for b baryons and their semileptonic decay. Assuming that three body decay processes such as Λb→Λc +ℓ -v dominate the semileptonic decay of b baryons, this ex cess corresponds to a product branching ratio BR(b→Λb)·BR(Λb→ Λc +ℓ-v)·BR(Λ c +→ΛX) = (0.95±0.22 (stat.)±0.21(syst.))%, where Λb and Λc + denote the bottom and charm baryons respectively.

Decamp, D., Deschizeaux, B., Goy, C., Lees, J., Minard, M., Alemany, R., et al. (1992). Evidence for b baryons in Z decays. PHYSICS LETTERS. SECTION B, 278(1-2), 209-216 [10.1016/0370-2693(92)90736-N].

Evidence for b baryons in Z decays

CARPINELLI, Massimo;
1992

Abstract

In 160 000 hadronic Z decays recorded with the ALEPH detector at LEP, the yields of Λℓ- and Λℓ+ combinations have been measured. The observed excess of Λℓ- over Λℓ+ of 53±13 is interpreted as evidence for b baryons and their semileptonic decay. Assuming that three body decay processes such as Λb→Λc +ℓ -v dominate the semileptonic decay of b baryons, this ex cess corresponds to a product branching ratio BR(b→Λb)·BR(Λb→ Λc +ℓ-v)·BR(Λ c +→ΛX) = (0.95±0.22 (stat.)±0.21(syst.))%, where Λb and Λc + denote the bottom and charm baryons respectively.
Articolo in rivista - Articolo scientifico
Physics
English
1992
278
1-2
209
216
none
Decamp, D., Deschizeaux, B., Goy, C., Lees, J., Minard, M., Alemany, R., et al. (1992). Evidence for b baryons in Z decays. PHYSICS LETTERS. SECTION B, 278(1-2), 209-216 [10.1016/0370-2693(92)90736-N].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/390455
Citazioni
  • Scopus 32
  • ???jsp.display-item.citation.isi??? 30
Social impact