kmatrix_simple

class KmatrixSimple(*args, **kwargs)

Bases: KmatrixSplitLSParticle

simple Kmatrix formula.

K-matrix

\[K_{i,j} = \sum_{a} \frac{g_{i,a} g_{j,a}}{m_a^2 - m^2+i\epsilon}\]

P-vector

\[P_{i} = \sum_{a} \frac{\beta_{a} g_{i,a}}{m_a^2 - m^2 +i\epsilon} + f_{bkg,i}\]

total amplitude

\[R(m) = n (1 - K i \rho n^2)^{-1} P\]

barrief factor

\[n_{ii} = q_i^l B'_l(q_i, 1/d, d)\]

phase space factor

\[\rho_{ii} = q_i/m\]

\(q_i\) is 0 when below threshold

build_barrier_factor(s)

build_k_matrix(s)

build_p_vector(s)

get_ls_amp(m)

init_params()

model_name = 'KmatrixSimple'

phsp_fractor(m, m1, m2)

barrier_factor(m, m1, m2, l, d=3.0)

get_relative_p(m, m1, m2)