Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comparing B -> X_u l nu_l to B -> X_s gamma   We suggest a method to determine V_ub / V_ts through a comparison of B -> X_u
l nu_l and B -> X_s gamma. The relevant quantity is the spectrum of the
light-cone component of the final state hadronic momentum, which in B -> X_s
gamma is the photon energy while in B -> X_u l nu_l this requires a measurement
of both hadronic energy and hadronic invariant mass. The non-perturbative
contributions at tree level to these distributions are identical and may be
cancelled by taking the ratio of the spectra. Radiative corrections to this
comparison are discussed to order alpha_s and are combined with the
non-perturbative contributions.

24
The categories of this paper are: dg-ga
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
2
The categories of this paper are: math
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
5
The categories of this paper are: gr-qc
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
14
The categories of this paper are: math-ph
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin