Measurement of the lepton energy in the decay B-bar -> X l nu-bar and determination of the Heavy Quark Expansion Parameters
| dc.creator | Briere, R. A. | |
| dc.date | 2002-09-12 | |
| dc.date.accessioned | 2026-07-07T06:28:45Z | |
| dc.date.available | 2026-07-07T06:28:45Z | |
| dc.description | We measured two moments of the lepton momentum spectrum in B -> X l nu, where l= e or mu, for p_l > 1.5 GeV/c. From these we derive the Heavy Quark Expansion (HQE) parameters Lambda-bar(MS-bar) = 0.39 +- 0.03(stat) +- 0.06(sys) +- 0.12(th) GeV and lambda_1 = -0.25 +- 0.02(stat) +- 0.05(sys) +- 0.14(th) GeV^2, through order 1/M_B^3 in the non-perturbative expansion and beta_0 alpha_s^2 in the perturbative expansion. The theoretical expression needed to extract |V_cb| from the measured semileptonic width is evaluated using these HQE parameters. Combined with the world average of the semileptonic width, we find |V_cb|=(40.8 +- 0.5(Gamma_sl) +- 0.4(lambda_1,Lambda-bar) +- 0.9(th)) 10^{-3}. Finally, the short range b-quark mass m_b(1S) is evaluated and found to be 4.82 +- 0.07(exp) +- 0.11(th) GeV/c^2. | |
| dc.description | 16 pages, 10 figures, submitted to ICHEP02, also available at http://www.lns.cornell.edu/public/CONF/2002/CONF02-10/paper-ichep02-lepton.ps | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0209024 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0209024 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/97803 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | Measurement of the lepton energy in the decay B-bar -> X l nu-bar and determination of the Heavy Quark Expansion Parameters | |
| dc.type | text |