Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of Exclusive B->X_u l nu Decays and Extraction of |V_{ub}| using
  Full Reconstruction Tagging at the Belle Experiment   We report the results of a study of the exclusive semileptonic decays
B->pi0lnu, B->pi+lnu, B->rho0lnu, B->rho+lnu and B->omegalnu, where l
represents an electron or a muon. The events are tagged by fully reconstructing
a second B meson in the event in a hadronic decay mode. The measured branching
fractions are Br(B->pi0lnu) = (0.80 +- 0.08 +- 0.04)x10^-4, Br(B->pi+lnu) =
(1.49 +- 0.09 +- 0.07)x10^-4, Br(B->rho0lnu) = (1.83 +- 0.10 +- 0.10)x10^-4,
Br(B->rho+lnu) = (3.22 +- 0.27 +- 0.24)x10^-4, and Br(B->omegalnu) =(1.07 +-
0.16 +- 0.07)x10^-4, where the first error is statistical and the second one is
systematic. The obtained branching fractions are inclusive of soft photon
emission. We also determine the branching fractions as a function of the
4-momentum transfer squared to the leptonic system q^2=(p_l+p_nu)^2, where p_l
and p_nu are the lepton and neutrino 4-momenta, respectively. Using the pion
modes, a recent LCSR calculation, lattice QCD results and a model-independent
description of the hadronic form factor, a value of the CKM matrix element
|V_{ub}| = (3.52 +- 0.29)x10^-3 is extracted. For the first time, a charmless
state with invariant mass greater than 1 GeV/c^2, which might be dominated by
the decay B->f2lnu, is observed. These results are obtained from a 711 1/fb
data sample that contains 772 millions BB pairs, collected near the Upsilon(4S)
resonance with the Belle detector at the KEKB asymmetric-energy e^+ e^-
collider.

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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: eess
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The categories of this paper are: supr-con
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The categories of this paper are: hep-lat
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The categories of this paper are: q-fin
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: stat
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The categories of this paper are: alg-geom
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph