# Wrap part title in part's page with titleformat

I am using titleformat to make some adjustments in the part's page and I want to wrap the title in half, to be centered as a text, but on the right side of the page. Any ideas?

This is my code

\documentclass{book}
\usepackage[explicit]{titlesec}
\usepackage{titletoc}
\titleformat{\part}[display]
{\huge\raggedleft }
{\thispagestyle{empty}
Part \thepart \\ \vspace{35pt}\bfseries#1}
{0pt}
{}
\begin{document}
\part{Introduction to Quantum Field Theory}
\end{document}

• You want the title itself to be on two lines, if I understand well? Mar 10, 2016 at 0:49
• Yes. Itself in two line and centered (like it is in an imaginary box) but at the left side of the page. Mar 10, 2016 at 1:13
• You said at the right side in your post. Mar 10, 2016 at 1:14
• yes right. My mistake. Mar 10, 2016 at 1:42
• And Part I must also be centred? Mar 10, 2016 at 1:46

Something like that?

\documentclass{book}
\usepackage[pagestyles ,newparttoc, explicit]{titlesec}
\usepackage[showframe]{geometry}
\usepackage{titletoc}

\titleformat{\part}[display]
{\thispagestyle{empty}\huge\bfseries\filleft }
{}%
{0pt}
{\begin{tabular}{c@{}}
\mdseries\partname~\thepart\\[35pt]#1\end{tabular}}

\titlespacing{\part}{0pt}{160pt}{0pt }

\begin{document}

\part{Introduction to \\Quantum Field Theory}

\end{document}