Study of Semileptonic Decays of B Mesons to Charmed Baryons

摘要

Using data collected by the CLEO II detector at a center-of-mass energy on or near the (Upsilon)(4S) resonance, we have determined the 90% confidence level upper limit (Beta)((bar B)(yields)(Lambda)(sub c)(sup+)e(sup -) X)/(Beta)((bar B)(yields) ((Lambda)(sub c)(sup+) or(bar(Lambda))(sub c)(sup -))X) < 0.05 for electrons with momentum above 0.6 GeV/c. We have also obtained the limit (Beta)(B(sup -)(yields)(Lambda)(sub c)(sup+)(bar p)e(sup -)((bar(nu))(sub e))/(Beta)((bar B)(yields)(Lambda)(sub c)(sup+)(bar p)X)< 0.04 at the 90% confidence level and measured the ratio(Beta)((bar B)(yields)(Lambda)(sub c)(sup+)(bar p)X)/(Beta)((bar B)(yields) ((Lambda)(sub c)(sup+) or(bar(Lambda))(sub c)(sup -))X)= 0.57(+-) 0.05(+-) 0.05.