Belle II membership

In order to become a member of the Belle II collaboration refer to NewComers.

In order to access the Belle II collaborative services, which are hosted at DESY, you need an account. The procedure to obtain this account is described below.  Please read this page carefully and also see warnings on the right before you proceed. 

Registration procedure


The standard  Belle II Registration procedure is based on Grid user certificates. Step-by-step instructions to obtain and use Grid user certificates are in the lower part of this page. There are possibilities though to register without a Grid certificate.


Belle II collaborators, who have (had) a DESY account, may want to try out whether their account has already been enabled for Belle II. In case of problems or doubts please contact See also menu on the right.

Belle II collaborators, who already hold a Grid user certificates and are members of the VO 'belle', can go directly to the registration portal. Make sure the name fields are filled correctly (see warnings on this page on the right).

Alternatively, a paper-based registration procedure is available.The two main steps of authentication ('Who are you?') and authorization ('Are you in Belle II?') have to be carried out manually. Therefore it will require more work from your side and from the administrators in your and our institute. Hence we would like to strongly encourage you again to go for the Grid user certificate based registration since you will need this certificate later on for accessing data and submitting jobs in the Belle II Grid anyway. See Belle II Paper-based Registration.

Students of Belle II who are not official members of the Belle II collaboration must use the Belle II Paper-based Registration. Make sure the form is signed by your institute representative!

B2TiP (non-Belle II) members of the Belle II theory platform (B2TiP) please refer to Belle II Registration for B2TiP Users. Belle II members should contact Phillip Urquijo and to become members of this special group.

External (non-Belle II) members of the Belle II theory platform (B2TiP) please refer to Belle II Registration for External Users.

Account creation

After your account has been created (please give it a few hours) you get further instructions by e-mail. Attention: We found those confirmation e-mails ending up in SPAM filters! After that you have to change your initial password on within the next 5 days. Your account is good for the Belle II wiki (confluence), the issue tracker (jira), the GIT repository (stash), and the build tool (bamboo). 

Computing ressources (NAF)

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

At the bottom of the request portal you are asked to agree to the 'Conditions of Use for Information-Processing Systems at DESY'. The underlying document regulates the legal side of the usage of computers at DESY. The document is rather old and will be consolidated. Some links target on local users and are therefore internal. The document contains links to pages which are not relevant for abroad users, such as the local work council ''.

Common Problems:

You may find more answers in the (FAQ) section.

Make sure all names are reasonable. The portal might take unreasonable entries from your Grid user certificate, e.g. numbers or e-mail addresses in the name fields. The order of given / family name might be different, e.g. in Asia. Please correct, if needed.

After your new account is activated you get notified by e-mail (in a few hours). Change your initial password in time! Do not register again! One account / password is valid for for all resources!

Users who have already a DESY account (even an expired one) may want to try out first if they can use the the account. If in doubt, contact . Please do not register via the portal!

On any rate, never register twice as long as you are not explicitly asked for.


Known Issues

  • Unfortunately there is a VO '' which is obsolete. Please do NOT register with the VO 'ebbel2'org' but with 'belle' at .
  • Errors such as "SSL_ERROR_HANDSHAKE_FAILURE_ALERT" indicate missing certificates in your browser. Please make sure that you have a valid Grid user certificate in your browser:
  • Firefox: Preferences /  Advanced / Certificates / View Certificates / Your Certificate

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