What happens if one party to arbitration did not sign an agreement for arbitration?

If one party did not sign an arbitration agreement, they generally cannot be compelled to participate in arbitration unless there are other legal grounds, such as a separate agreement, a course of conduct indicating acceptance, or applicable laws that enforce arbitration despite the lack of a signature. Courts often assess whether the non-signing party has implicitly agreed to arbitrate through their actions. Ultimately, the enforceability of the arbitration clause will depend on the specific circumstances and relevant jurisdictional laws.