Amir Hossein Zamani NIa and Jamshid Momtaz also accompany the team as experts on legal affairs.
Zarif will meet the Western side’s leader in Iran nuclear negotiations Catherine Ashton at a working dinner on Tuesday.
Also, on the same day, Araqchi is to meet US Deputy Secretary of State William Burns and Under Secretary of State for Political Affairs Wendy Sherman.
On Wednesday, Zarif, Ashton, and US Secretary of State John Kerry will join for more talks on a comprehensive agreement on Iran's nuclear program.
On Monday, Zarif had said in meeting with Vietnam’s Deputy Prime Minister Nguyen Xuan Phuc in the Iranian capital, Tehran that "The Islamic Republic of Iran will continue its nuclear enrichment within the framework of international regulations.”