Mughatil ibn Bakri, a Medieval authority of the Al-Nizamiyya of Baghdad, and son in law of Nizam al-Mulk, is known by a treatise that he wrote, in which he recounts in detail a Sunni – Shia debate taking place in the court of Sultan Malik Shah I. The text was written in Arabic under the title "مؤتمرعلماء بغداد" and has been translated into Persian under the title In search of Truth in Baghdad (در جستجوی حق در بغداد). If there is an English translation of this treatise, can you please send it to me? In case there is no English translation, kindly provide me with the Persian translation of the text.

I am not aware of an English translation, but here is a Persian translation:

https://archive.org/details/MutamarOlamaBaqdadfarsi/page/n21/mode/2up