Vantiv to buy Mercury Payment for about $1.65 bln

May 12 (Reuters) - Payment processor Vantiv Inc said it would buy Mercury Payment Systems LLC for about $1.65 billion from private equity firm Silver Lake Group LLC.

Vantiv said it expects the deal to modestly add to its adjusted per-share earnings in 2014.

(Reporting by Anil D'Silva in Bangalore)