We revisit the status of hybrid inflation in the light of Planck and recent BICEP2 results , taking care of possible transient violations of the slow-roll conditions as the field passes from the large field to the vacuum dominated phase .
The usual regime where observable scales exit the Hubble radius in the vacuum dominated phase predicts a blue scalar spectrum , which is ruled out .
But whereas assuming slow-roll one expects this regime to be generic , by solving the exact dynamics we identify the parameter space for which the small field phase is naturally avoided due to slow-roll violations at the end of the large field phase .
When the number of e-folds generated at small field is negligible , the model predictions are degenerated with those of a quadratic potential .
There exists also a transitory case for which the small field phase is sufficiently long to affect importantly the observable predictions .
Interestingly , in this case the spectral index and the tensor to scalar ratio agree respectively with the best fit of Planck and BICEP2 .
This results in a \Delta \chi ^ { 2 } \simeq 5.0 in favor of hybrid inflation for Planck+BICEP2 ( \Delta \chi ^ { 2 } \simeq 0.9 for Planck only ) .
The last considered regime is when the critical point at which inflation ends is located in the large field phase .
It is constrained to be lower than about ten times the reduced Planck mass .
The analysis has been conducted with the use of Markov-Chain-Monte-Carlo bayesian method , in a reheating consistent way , and we present the posterior probability distributions for all the model parameters .