Business Analysis is the practice of enabling change in an organizational context, by defining needs and recommending solutions that deliver value to stakeholders. (The International Institute for Business Analysis). Business Analysis, while ultimately process driven, is closely linked to system development.
User Experience is the study of the interaction between the company and the customer or employee. It could be a website, software, mobile application, brand colors, banners, or even a greeting at the door. The interaction between any company and their customers starts with the employees. If employees are happy and feel valued, they are more likely to stay and work for the benefit of themselves and therefore, the company. This allows the happy employee to interact with the customers and coworkers in the most professional and respectful way.