Dispatch and listen event in polymer

gistfile1.js

// Dispatch
var event = {
 bubbles: false,
 composed: true,
 detail: {
   criteria: selectedCriterion
 }
}

this.dispatchEvent(new CustomEvent('event', event));

// Listener
ready() {
 super.ready();
 
 this.addEventListener('event', e => this._handleEvent(e));
}