 Shares of Papa Johns International Inc. PZZA, -2.37 slid 2.6 toward a near 2-year low in morning trading Tuesday, after Stifel Nicolaus analyst Chris OCull cut his price target, citing signs that the pizza seller was not delivering in recent months. We believe quick-service pizza may report the weakest SRS same-restaurant sales performance of any restaurant category during 3Q, OCull wrote in a note to clients. 