@article{a01bdf4385b04a0baf7d89a02ddf6391,

title = "Measurement of the semileptonic branching fraction of inclusive b baryon decays to Λ",

abstract = "We present the first measurement of the ratio RΛℓ defined as RΛℓ = BR(Λb → ΛℓX)/BR(Λb → ΛX) where Λb denotes all weakly decaying b baryons and ℓ represents the average of electrons and muons. Using all hadronic Z0 decay events collected with the OPAL detector near the Z0 resonance, we measure RΛℓ; = (7.0 ± 1.2 ± 0.7)%. We also measure f(b → Λb) · BR(Λb → ΛX) = (3.93 ± 0.46 ± 0.37)%, f(b → B) · BR(B → ΛX) = (1.94 ± 0.28 ± 0.24)%, and BR(b → ΛX) = (5.87 ± 0.46 ± 0.48)%. In all cases, the uncertainties shown are statistical and systematic, respectively.",

author = "{The OPAL Collaboration} and K. Ackerstaff and G. Alexander and J. Allison and N. Altekamp and K. Ametewee and Anderson, {K. J.} and S. Anderson and S. Arcelli and S. Asai and D. Axen and G. Azuelos and Ball, {A. H.} and E. Barberio and Barlow, {R. J.} and R. Bartoldus and Batley, {J. R.} and J. Bechtluft and C. Beeston and T. Behnke and Bell, {A. N.} and Bell, {K. W.} and G. Bella and S. Bentvelsen and P. Berlich and S. Bethke and O. Biebel and A. Biguzzi and V. Blobel and Bloodworth, {I. J.} and Bloomer, {J. E.} and M. Bobinski and P. Bock and Bosch, {H. M.} and M. Boutemeur and Bouwens, {B. T.} and S. Braibant and Brown, {R. M.} and Burckhart, {H. J.} and C. Burgard and R. B{\"u}rgin and P. Capiluppi and Carnegie, {R. K.} and Carter, {A. A.} and Carter, {J. R.} and Chang, {C. Y.} and Charlton, {D. G.} and D. Chrisman and Clarke, {P. E.L.} and I. Cohen and R. Folman",

year = "1997",

month = jan,

day = "1",

doi = "10.1007/s002880050405",

language = "English",

volume = "74",

pages = "423--435",

journal = "Zeitschrift fur Physik C-Particles and Fields",

issn = "0170-9739",

publisher = "Springer New York",

number = "3",

}