Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A New Method for Selecting Exclusive Semileptonic Charmless B-Decays at
  $e^+ e^-$ Colliders at the $\Upsilon(4S)$   We introduce a new method for selecting exclusive semileptonic charmless
B-decays in the presence of a large background. The method can be applied to
charged and neutral B-mesons decaying into any exclusive neutral or charged
hadronic final state. The method is designed for high luminosity $\eplemi$
colliders operating at the $\Upsilon(4S)$. It employs an improved partial
reconstruction technique for $\Dstar$-mesons and a novel 0-C event fit to both
B-meson's decay products resulting in the kinematics of all particles
(including neutrinos) in the event. The charged lepton energies are accessible
from $1.0 \GeV$ to the kinematic limit.

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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
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The categories of this paper are: acc-phys
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The categories of this paper are: patt-sol
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The categories of this paper are: eess
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
3
The categories of this paper are: physics
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The categories of this paper are: nlin
4
The categories of this paper are: cond-mat