What is the difference between a disciplinary investigation and a disciplinary hearing?
The purpose of a disciplinary investigatory meeting is to establish the facts of the case, i.e. what really happened, dates, documentation, witnesses, where and when incidents allegedly occurred, including looking at mitigating reasons, if relevant. The company will not be taking any action against you at this meeting.
The purpose of a disciplinary hearing is to decide on all the evidence presented by you and from the investigation, what action to take, i.e. whether to award a disciplinary sanction including dismissal or no sanction at all, they may even recommend training as an outcome.