Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Form Factors for B -> pi l nu-bar_l and B -> K* gamma Decays on the
  Lattice   We present a unified method for analysing form factors in B -> pi l nu-bar_l
and B -> K* gamma decays. The analysis provides consistency checks on the q^2
and 1/M extrapolations necessary to obtain the physical decay rates. For the
first time the q^2 dependence of the form factors is obtained at the B scale.
In the B -> pi l nu-bar_l case, we show that pole fits to f^+ may not be
consistent with the q^2 behaviour of f^0, leading to a possible factor of two
uncertainty in the decay rate and hence in the value of |V_{ub}|^2 deduced from
it. For B -> K* gamma, from the combined analysis of form factors T_1 and T_2,
we find the hadronisation ratio R_{K^*} of the exclusive B -> K* gamma to the
inclusive b -> s gamma rates is of order 35% or 15% for constant and pole-type
behaviour of T_2 respectively.

13
The categories of this paper are: quant-ph
7
The categories of this paper are: hep-th
35
The categories of this paper are: mtrl-th
24
The categories of this paper are: dg-ga
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
21
The categories of this paper are: adap-org