Welcome to the Belle II wiki pages. Only the Belle II Public WebHome page can be viewed publicly without login. In order to access the Belle II Internal WebHome, users need credentials (account_name/password) to login. Please refer to Belle II User Registration. 

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Downtime for Belle II collaborative services which run in virtual machines on Wed 18.12.2019, 10-18h CET (18h JST) for important security and version updates of the underlying XEN-cluster. Affected are all services listed in Belle II Collaborative Services and Tools incl. the Belle II eLog, authorship and shift management. See Downtime 2019-12-18 10-18h CET (18h JST) for details.

The most frequent user issues:

  1. New members: Belle II User Registration
  2. Login: account_name / password (NOT email address)
  3. Expired/lost password: b2-helpdesk_AT_belle2.org (NOT uco_AT_desy.de). See Belle II Registration and Account FAQ
  4. Collaborative services:  Belle II Collaborative Services and Tools



  • 2019-12-18: B2CS downtime 10-18h CET


In order to become a Belle II author and/or to check your eligibility please refer to the page Belle II Authorship by Leo Piilonen.

For the B2MMS please make sure to explicitly use the address https://b2mms.belle2.org/ (rather than any old address)! Please update your bookmarks accordingly! The documentation is of course still at Belle II Membership Management System.

2019-02-19 Belle II Indico

In order to make use of the new Belle II Indico Instructions make sure you log in to indico.belle2.org with your DESY credentials (Login with ldap using your account name). You will then become part of the Indico  Belle II group which allows you to view the agendas.

2018-05-28 Group Pages

We have created a top page Belle II Group Pages under which Belle II communities or groups may set up own pages.

2018-05-25 DESY Data Privacy Policy

As of 25 May 2018 the DESY Data Privacy Policy is mandatory due to regulations of the European Union.

Becoming a Belle II Member and Getting Access to the Belle II Collaborative Services and Tools

In order to gain access to the DESY analysis facility (NAF)  consider Belle II Requesting Additional Resource Access (login).

Collaborative Services

We list here a selection of Belle II Collaborative Services (B2CS) and their URLs for easy access. Please do not ignore the documentation. All services require a login with the DESY credentials (accountname/password), not email address. Also note Belle II Support Contacts.

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