Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the lepton energy in the decay B-bar -> X l nu-bar and
  determination of the Heavy Quark Expansion Parameters   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.

10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
12
The categories of this paper are: nucl-th
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The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
4
The categories of this paper are: cond-mat
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The categories of this paper are: eess
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The categories of this paper are: stat