Radiation-sensitive resin composition, method for forming resist pattern, polymer and polymerizable compound

A polymer comprising a repeating unit shown by a general formula (c0),

• wherein
• n is an integer from 1 to 3,
• R1 represents an alkali-labile group, wherein each R1 is either a same as or different from each other when n is 2 or 3,
• A represents an oxygen atom, —NR′—, —CO—O—#, or —SO2—O—##, wherein R′ represents a hydrogen atom or an alkali-labile group and “#” and “##” each indicate a bonding hand bonded to R1 and wherein each A is either a same as or different from each other when n is 2 or 3,
• R2 represents a single bond, a divalent chain hydrocarbon group having 1 to 10 carbon atoms, or a divalent cyclic hydrocarbon group having 4 to 20 carbon atoms, wherein each R2 is either a same as or different from each other when n is 2 or 3,
• X0 represents a single bond or a divalent chain hydrocarbon group having 1 to 20 carbon atoms in which some or all of hydrogen atoms are substituted with a fluorine atom, wherein each X° is either a same as or different from each other when n is 2 or 3,
• R3 represents an (n+1)-valent hydrocarbon group having 1 to 20 carbon atoms, wherein, optionally, an oxygen atom, a sulfur atom, an imino group, a carbonyl group, —CO—O—, or —CO—NH— is bonded to an end of R3 which is bonded to R2,
• E represents an oxygen atom, —CO—O—###, or —CO—NH—####, wherein “###” and “####” each indicate a bonding hand bonded to R3, and
• R represents a hydrogen atom, a methyl group, or a trifluoromethyl group.

A compound shown by a general formula (Mc2-2), the compound being other than a compound shown by a formula (4) or a formula (5),

• wherein
• R9 represents a group shown by a general formula (1), a general formula (2) or a general formula (3),
• X1 represents a single bond, a difluoromethylene group, or a linear or branched divalent perfluorohydrocarbon group having 2 to 20 carbon atoms,
• R2 represents a single bond, a methylene group, a linear or branched divalent hydrocarbon group having 2 to 10 carbon atoms, or a divalent cyclic hydrocarbon group having 4 to 20 carbon atoms,
• R31 represents a methylene group, a linear or branched divalent hydrocarbon group having 2 to 10 carbon atoms, or a divalent cyclic hydrocarbon group having 4 to 20 carbon atoms, wherein, optionally, an oxygen atom, a sulfur atom, an imino group, a carbonyl group, —CO—O—, or —CO—NH— is bonded to an end of R31 which is bonded to R2, and
• R represents a hydrogen atom, a methyl group, or a trifluoromethyl group,
• wherein
• R10 represents a halogen atom, an alkyl group having 1 to 10 carbon atoms, an alkoxy group having 1 to 10 carbon atoms, an acyl group having 1 to 10 carbon atoms, or an acyloxy group having 1 to 10 carbon atoms, wherein each R10 is either a same as or different from each other when a plurality of R10 are present,
• m1 is an integer from 0 to 5,
• m2 is an integer from 0 to 4, and
• each of R11 and R12 independently represents a hydrogen atom or an alkyl group having 1 to 10 carbon atoms, or R11 and R12 bond to each other to form an alicyclic structure having 4 to 20 carbon atoms together with the carbon atom bonded to R11 and R12,