Hadronic Mass Moments in Inclusive Semileptonic B Meson Decays

Details Hadronic Mass Moments in Inclusive Semileptonic B Meson Decays Hadronic Mass Moments in Inclusive Semileptonic B Meson Decays

2001-08-16

arxiv.org/abs/hep-ex/0108033v3

Phys.Rev.Lett.87:251808,2001

Physics

High Energy Physics

High Energy Physics - Experiment

11 pages postscript, also available through http://w4.lns.cornell.edu/public/CLNS, submitted to PRL

Scientific paper

10.1103/PhysRevLett.87.251808

We have measured the first and second moments of the hadronic mass-squared distribution in B -> X_c l nu, for P(lepton) > 1.5 GeV/c. We find = 0.251 +- 0.066 GeV^2, < (M_X^2 -)^2 > = 0.576 +- 0.170 GeV^4, where M_D[Bar] is the spin-averaged D meson mass. From that first moment and the first moment of the photon energy spectrum in b -> s gamma, we find the HQET parameter lambda_1 (MS[Bar], to order 1/M^3 and beta_0 alpha_s^2) to be -0.24 +- 0.11 GeV^2. Using these first moments and the B semileptonic width, and assuming parton-hadron duality, we obtain |V_cb| = 0.0404 +- 0.0013.

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