A note on musţaťa's computation of multiplier ideals of hyperplane arrangements

In 2006, M. Mustaţǎ used jet schemes to compute the multiplier ideals of reduced hyperplane arrangements. We give a simpler proof using a log resolution and generalize to non-reduced arrangements. By applying the idea of wonderful models introduced by De Concini-Procesi in 1995, we also simplify the result. Indeed, Mustata's result expresses the multiplier ideal as an intersection, and our result uses (generally) fewer terms in the intersection.