CREATE TABLE table_56577 ("Particle" CLOB, "Symbol" CLOB, "Makeup" CLOB, "Rest mass MeV / c 2" CLOB, "Isospin I" CLOB, "Spin  (  Parity  )  J P" CLOB, "Commonly decays to" CLOB)

Which Particle has a Rest mass MeV/c 2 of 1383.7 1.0?
SELECT "Particle" FROM table_56577 WHERE "Rest mass MeV / c 2" = '1383.7±1.0'
SELECT "Particle" FROM "table_56577" WHERE "Rest mass MeV / c 2" = '1383.7±1.0'