UPDATE 1-JAB Holding to buy bakery chain Panera Bread in $7.5 bln deal

April 5 (Reuters) - JAB Holdings, the owner of Caribou Coffee and Peet's Coffee & Tea, said on Wednesday it would buy U.S. bakery chain Panera Bread Co in a deal valued at about $7.5 billion, including debt, as it expands its coffee and breakfast empire.