Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: |V_ub| and Constraints on the Leading-Twist Pion Distribution Amplitude
  from B->pi l nu   Using new experimental data on the leptonic mass spectrum of B->pi l nu, we
simultaneously determine |V_ub| and constrain a_2^pi and a_4^pi, the first two
Gegenbauer moments of the pion's leading-twist distribution amplitude. We find
|V_ub| = (3.2\pm 0.1\pm 0.1\pm 0.3) 10^-3, where the first error is
experimental, the second comes from the shape of the form factor in q^2 and the
third is a 8% uncertainty from the normalisation of the form factor. We also
find a_2^pi(1 GeV)=0.19\pm 0.19 and a_4^pi(1 GeV)\geq -0.07.

11
The categories of this paper are: hep-lat
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin