Salt and photoresist composition containing the same

A salt represented by the formula (I):

• wherein Q1 and Q2 independently each represent a fluorine atom or a C1-C6 perfluoroalkyl group,
• R1 and R2 independently each represent a hydrogen atom, a fluorine atom or a C1-C6 perfluoroalkyl group,
• z represents an integer of 0 to 6,
• X1 and X2 independently each represent *—CO—O—, *—O—CO—, —O—CO—O— or —O—, where * represents a binding potion to —C(R1)(R2)—, —C(Q1)(Q2)- or L4,
• L1 represents a C1-C28 divalent saturated hydrocarbon group in which a methylene group can be replaced by —O—, —S—, —CO— or —S(O)2— and in which a hydrogen atom can be replaced by a fluorine atom or a hydroxyl group,
• L2, L3 and L4 independently each represent a single bond or a C1-C6 alkanediyl group,
• Xa and Xb independently each represent an oxygen atom or a sulfur atom,
• R3 and R4 independently each represent a C1-C6 alkyl group, or represent a C5-C12 alicyclic hydrocarbon ring together with a carbon atom bonded to R3 and R4,
• R5 represents a hydrogen atom, a hydroxyl group, a halogen atom or a C3-C24 cyclic hydrocarbon group in which a hydrogen atom can be replaced by a substituent and in which a methylene group can be replaced by —O—, —S—, —CO— or —S(O)2—, and
• Z+ represents an organic cation.