A process for preparing a branched elastomeric polymer, said process comprising: (a) polymerizing at least one conjugated diene and a compound of Formula 1 as defined below, and optionally one or more aromatic vinyl monomers, in the presence of an initiator compound, (a') polymerizing at least one conjugated diene and optionally one or more aromatic vinyl monomers in the presence of an initiator compound obtainable by reacting a compound of Formula 1 as defined below with an organo-alkali metal compound, or (a") reacting a living polymer, obtainable by anionically polymerizing at least one conjugated diene and optionally one or more aromatic vinyl monomers, with a compound of Formula 1 as defined below, characterized in that (a), (a') and (a") is carried out in the presence of a stabilizer compound of Formula 2 as defined below; -B n (Formula 1) wherein A is an organic group having at least two amino groups; each B is independently selected from a group -Si(R 1)(R 2)(R 3), wherein R 1, R 2 and R 3 are each independently selected from vinyl, butadienyl, methyl, ethyl, propyl, butyl, hexyl, octyl, phenyl and benzyl, with the proviso that at least one of R 1, R 2 and R 3 is selected from vinyl and butadienyl, wherein each group B is a substituent of an amino group of group A; at least two of the amino groups of group A are each substituted with at least one group B; n is an integer of at least 2, preferably an integer selected from 2 to 6; and all amino groups in group A are tertiary amino groups; wherein R' is independently selected from C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 6 -C 18 aryl and C 7 -C 18 alkylaryl, wherein the two R' groups may be connected to form a ring and the ring may contain, further to the Si-bonded nitrogen atom, one or more of an oxygen atom, a nitrogen atom, an >N(C 1 -C 6 alkyl, C 6 -C 18 aryl, C 7 -C 18 alkylaryl) group and a sulfur atom; R" is selected from C 1 -C 6 hydrocarbyl; R"' is independently selected from C 1 -C 18 hydrocarbyl; R a, R b and R c are independently selected from hydrogen, methyl, ethyl and vinyl; x is an integer selected from 1 and 2; y is an integer selected from 0, 1 and 2; z is an integer selected from 0, 1 and 2; and x+y+z=3; m is selected from 0 and 1; with the proviso that, when none of R a, R b and R c is vinyl, then m=0. (a) polymerizing at least one conjugated diene and a compound of Formula 1 as defined below, and optionally one or more aromatic vinyl monomers, in the presence of an initiator compound, (a') polymerizing at least one conjugated diene and optionally one or more aromatic vinyl monomers in the presence of an initiator compound obtainable by reacting a compound of Formula 1 as defined below with an organo-alkali metal compound, or (a") reacting a living polymer, obtainable by anionically polymerizing at least one conjugated diene and optionally one or more aromatic vinyl monomers, with a compound of Formula 1 as defined below, (a') polymerizing at least one conjugated diene and optionally one or more aromatic vinyl monomers in the presence of an initiator compound obtainable by reacting a compound of Formula 1 as defined below with an organo-alkali metal compound, or (a") reacting a living polymer, obtainable by anionically polymerizing at least one conjugated diene and optionally one or more aromatic vinyl monomers, with a compound of Formula 1 as defined below, A is an organic group having at least two amino groups; each B is independently selected from a group -Si(R 1)(R 2)(R 3), wherein R 1, R 2 and R 3 are each independently selected from vinyl, butadienyl, methyl, ethyl, propyl, butyl, hexyl, octyl, phenyl and benzyl, with the proviso that at least one of R 1, R 2 and R 3 is selected from vinyl and butadienyl, wherein each group B is a substituent of an amino group of group A; at least two of the amino groups of group A are each substituted with at least one group B; n is an integer of at least 2, preferably an integer selected from 2 to 6; and all amino groups in group A are tertiary amino groups; R' is independently selected from C 1 -C 12 alkyl, C 2 -C 12 alkenyl, C 6 -C 18 aryl and C 7 -C 18 alkylaryl, wherein the two R' groups may be connected to form a ring and the ring may contain, further to the Si-bonded nitrogen atom, one or more of an oxygen atom, a nitrogen atom, an >N(C 1 -C 6 alkyl, C 6 -C 18 aryl, C 7 -C 18 alkylaryl) group and a sulfur atom; R" is selected from C 1 -C 6 hydrocarbyl; R"' is independently selected from C 1 -C 18 hydrocarbyl; R a, R b and R c are independently selected from hydrogen, methyl, ethyl and vinyl; x is an integer selected from 1 and 2; y is an integer selected from 0, 1 and 2; z is an integer selected from 0, 1 and 2; and x+y+z=3; m is selected from 0 and 1; with the proviso that, when none of R a, R b and R c is vinyl, then m=0.