```
if(pdg_tau[l] == 15): #if the resulting particle from the nu_tau CC interaction is a tau
for p in range(fdaughter_tau[l],ldaughter_tau[l]+1): #loop over the tau's first daughter to last daughter
energy_new = momentum_cast_tau[3::4][p] #redefine energy so it's just for the tau's daughters #momentum_x_tau = momentum_cast_tau[0::4][p] #define x momentum #momentum_y_tau = momentum_cast_tau[1::4][p] #define y momentum #momentum_z_tau = momentum_cast_tau[2::4][p] #define z momentum #beam2 = TVector3(0,0,1) #define beam in the z direction #momentum_vec_tau = TVector3(momentum_x_tau,momentum_y_tau,momentum_z_tau) #create a three vector of the momentum component #angle_tau = root.Math.VectorUtil.Angle(momentum_vec_tau,beam2) #angle between beam and momentum vector
if(pdg_tau[p] == 111):
hist_tau_energy.Fill(energy_new) #fill the energy histogram
tau_mu_energy.append(energy_new) #append the energy values to the array
for p in range()
if(pdg_tau[p] == 211) # decay 1
hist_tau_energy.Fill(energy_new) #fill the energy histogram#
tau_mu_energy.append(energy_new) #append the energy values to the array
```

The thing i need help with is trying the to make the for loops beyond the first not use all p, as my goal is to narrow down tau hadronic decays. How do I record which daughter it stopped on and how to exclude that p and those before it in the next for loop so i can “whittle down” the decay particles? Note the second for loop isnt complete because i am stuck as to how t approach this