Your heart is able to beat on its own at around 50 beats per minute, because of the electrical impulses which are generated by the heart muscle. But without a brain you would not be able to live.
The brain stem uses the autonomic nerves to control heart rate, and without those the heart rate would not be able to beat as fast as it needs to, to be able to survive.
Some infants are born with anencephaly (where most of the brain is missing) but if the infant with anencephaly is born alive, the brain stem is present. Such infants usually die within hours or days of birth.
People can be 'brain dead' but their heart is functioning because they're connected to life support, and they have brain stem function (which controls heart rate). In these cases a patient can be considered 'brain dead' because all higher functions of the brain have ceased, and often even with support present the body will cease to function within hours or days.
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no it couldn't your brain works everything in your body like your heart and if you had no brain your heart would stop and you would die.