Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Large Penguin effects in the CP Asymmetry of B0d ->pi+pi-   Penguin effects in the CP asymmetries of $B^0_d\rightarrow \pi^+\pi^-$ ,
$\bd\rightarrow\rho^{\pm}\pi^{\mp}$ and $\bd\rightarrow a^{\pm}_1 \pi^{\mp}$
are studied as function of the CKM unitarity triangle $\alpha$. Despite a
fairly small penguin amplitude, it leads to quite sizable uncertainties in the
determination of $\sin(2\alpha)$ from all but very large asymmetries. This
effect is maximal for vanishing final state interaction phases, for which it
can cause, for instance, an asymmetry of 40\%\ if $\alpha=\pi/2$.

33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
14
The categories of this paper are: math-ph
34
The categories of this paper are: chem-ph
20
The categories of this paper are: acc-phys
18
The categories of this paper are: econ
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn