CMS is a collaboration of institutions, which have joined together to build and operate the CMS detector, to analyze the data recorded with it, and to exploit the physics potential of the Large Hadron Collider at CERN.


There are three ways in which institutes can participate in CMS. An institute with FULL MEMBERSHIP profits from being a member of a leading international scientific community, by taking part in technology development, data processing and computing, and physics analysis. For institutes
wishing to join the collaboration, but whose resources initially preclude full membership, two other categories are defined, both offering a meaningful but more restricted role. New institutions may join for a time-limited period as a COOPERATING INSTITUTE, allowing them to gain experience of a global
collaboration as a precursor to full membership. Alternatively, ASSOCIATED INSTITUTES collaborate on technical aspects such as engineering or computing, for an indefinite period, to the mutual benefit of both parties.

For more info please consult the "How to join CMS" and "Full Member Responsibility" official documents.


In the first instance, an institution wishing to join the collaboration should contact the CMS Spokesperson to express its interest. Discussions can initially proceed through informal contacts, but at some point, the official joining procedure must be launched via a formal letter (Letter of Intent). The
Spokesperson will then bring the application to the attention of the CMS Management Board to explore how the new collaborators may be integrated into the collaboration and consult with the relevant CMS Regional Representative. A letter of acknowledgement will be sent by the spokesperson to the applying
institute, following which the CMS Resources Manager will request information regarding the viability and means of the necessary financial contributions. The institute must then reply, acknowledging its understanding of the required financial and operational contributions, and confirming its readiness to meet
them, via a letter signed by the Institute Director. Following this exchange of information, the Chair of the Collaboration Board, the Spokesperson and the Resources Manager will seek to meet the applicants and a representative of the relevant Funding Agency, to discuss in detail the terms of entry.
The Team Leader of the prospective new collaborating institute will be invited to give a short presentation at a Collaboration Board meeting, which should provide information on the composition and interests of the research group, their relevant experience, and the proposed contribution to collaboration
activities. After the presentation, the Collaboration Board will discuss the application, and any questions raised will be passed to the applicants for clarification. A final decision on admission will be made at a subsequent Collaboration Board meeting via a formal vote.