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This is the entry page to the new Belle II user registration documentation. It obsoletes all former procedures in particular the paper-based registration is obsolete!


The Belle II Membership Management System (B2MMS) was announced and presented at the 28B2GM at KEK in October 2017.Since January 2018 it is the exclusive source for Belle II authors, mailing, and voting.

Table of Contents


Before you start please:

  • read this documentation incl. notes, warnings, and infos on the right,
  • consider the Belle II Registration and Account FAQ,
  • never register twice/again, a second registration will NOT reset a forgotten password,
  • if you have or ever had an account at DESY (summer student, other group etc.) please denote it in the form; the account will be reactivated,
  • do not ignore warnings in the portal,
  • the account name must be a string of 4-8 characters not an email address,
  • account names and email addresses are case insensitive, so use lower cases,
  • remember the temporary password which you chose in the portal,
  • note that the account creation takes a workday (in CET),
  • you obtain an address first(.middle) which forwards to your PEM,
  • you may find your email address in your B2MMS personal record at the bottom!


All users who want to work in the context of the Belle II collaboration must register to the Belle II Membership Management System (B2MMS)to become so-called Belle II users. In addition, users will obtain a set of login credentials (account name / password) from the DESY registry which is good to access all Belle II collaborative services and tools, including the B2MMS itself. Note, this is not a KEK account!

Becoming a Belle II user consists of two steps:

  1. The identity of the user must be proven (authentication).
  2. The permission to become a Belle II user must be given (authorization).

Users will then be automatically informed by the DESY registry of the creation of their account. Note: The approval workflow and the creation of the credentials takes one workday.

If you have register once as a Belle II user, your record will remain even if your membership expires. Please never ever register again. Status and attributes of your record can be changed at any time; even after expiration or with a new institution. See Instructions for Users (login required).

Users who have an account from former work at DESY even outside Belle II (summer student, other group etc.), please register for Belle II and denote the account name in the account field. It will be reactivated/prepared.

If you are interested in using the DESY Analysis Facility (NAF) which provides computing and storage resources for inactive work as a complementary approach to the Grid, please let us know. Your account can be prepared for the NAF (login required). Your membership in Belle II is mandatory!



Belle II users are users who work in the context of Belle II and need access to Belle II internals such as confluence, JIRA etc.. This includes official members of the Belle II collaboration (Belle II members) as well as students and technical staff. According to the by-laws the B2MMS provides different categories.

Belle II users are:

  • all official members of the Belle II collaboration usually physicists and PhD students (Belle II members)
  • temporary users such as students (if not official members),
  • technical staff,
  • visitors who need access to the Belle II collaborative services of non-Belle II institutions (Please choose the inviting institute as home).


How to register

  • If users hold a Grid user certificate, they may use the registration by certificate.
  • If not, users should contact the Institutional Board (IB) representative (IR) of their Belle II home institution, who will invite the user to register. For security reasons, a direct access to the registration portal is not possible.


With successfully filling and sending the form on the portal, the user's part is done. The user will see a message such as "Request for Belle2 membership was created. Desired account name: ...". An email will be sent to the representative (IR) of the Belle II institution who must approve the request.

As soon as the registration request is approved by the IR, the user will be added to the B2MMS and login credentials will be created in the DESY registry. The user will be informed by Email and will be asked to reset the initial password which was set by the portal. Please strictly obey the DESY Requirements for Account Names and Passwords . The creation of the credentials is finished within one work day (CET).


The registration as 'Physicist - permanent/staff' requires the prior approval of the institutional board (IB) otherwise the request will be denied. please check the Belle II contacts web.

The DESY registry will use the names you have given as 'given middle family' and create email addresses such as and Make up your mind if you really want the middle name.



Please never ever register again or twice.

If you are unsure whether you have already registered, try to access the B2MMS where you will be asked to log in. To reset a lost password see the FAQ.

If your institution has changed, review and change your record according to the Instructions for Users.


If you hold a DESY account from another project which is not enable for Belle II, register and name your already existing account.

Please use your institute email address! Avoid gmail.

The account name is a case insensitive string of 4-8 characters. It is not an email address. Please remember the initial password which is created for you when filling the portal You will need it when your account is ready. Please denote the DESY Requirements for Account Names and Passwords.


The DESY registry will use the names you have given as 'given middle family' and create email addresses such as and Make up your mind if you really want the middle name. The spaces will be transformed to dots! Example: 'Nino de Angelo' will become '' and '' whereas 'Nino deAngelo' (no middle name) will end up in ''.


The creation of the credentials in the DESY registry will be started after the IR has approved the request and takes one workday. Keep in mind: DESY is on CET. Users will be informed on success and will be asked to login with the initial password and to set a new password.

Belle II Registration Portal

  • If users hold a Grid user certificate, they may use the registration by certificate.
  • If you were invited and have received an email with a temporary Username / Password, go to this link.

DESY Analysis Facility (NAF)

DESY operates an Analysis Facility (NAF) which provides computing resources for Belle II analysis. In order to gain access to those resources please refer to Belle II Requesting Additional Resource Access (login required).

Additional Groups

Accounts and groups are managed by the DESY registry. By default all user accounts are associated with the main Belle II group. If additional groups are needed please contact

KEK Registration

If you need the KEKCC, VPN, KDS accounts issued by the KEK computing center, please go back to Belle II Newcomers#KEKRegistration,

Belle VO (Virtual Organization) and DIRAC user Registration

If you need to utilize the Belle II GRID infrastructure, please go to Getting started on GRID (this page is protected only for Belle II members)