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 to login. Please refer to Belle II User Registration. 

Search through "Belle II" space

The three most frequent user problems:

  1. Missed to change expiring password in time: Ask b2-helpdesk_AT_belle2.org (NOT uco_AT_desy.de). See FAQ.
  2. Wonder about desy.de and belle2.org email addresses: Check your personal record in the Belle II Membership Management System (B2MMS).
  3. Want to change email address in coll-members_AT_belle2.org: The list is automatically generated from the B2MMS. Please change your home email address in the Belle II Membership Management System (B2MMS). This also applies for b2mms-users_AT_belle2.org and b2mms-reps_AT_belle2.org



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

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

Maintenance and trouble announcements for the DESY infrastructure incl. the ATLASSIAN tools are posted at it-news.desy.de . Please note that the time of day is given in CET resp. CEST.

Since January 2018 the Belle II Membership Management System (B2MMS) is the source for the Belle II members, authors, and voting lists! The collaboration Email list is exclusively generated from the B2MMS. See also the Belle II Registration and Account FAQ.

Do you have already DESY credentials to login to the Belle II collaborative services? Try to login at the top right. If not, see the Belle II Registration and Account FAQ.

You may find your belle2.org email address in your Belle II Membership Management System (B2MMS) personal record at the bottom! Note that the addresses are bound to your account in the DESY registry and are NOT updated when names are changed in the B2MMS.

The collaboration email list is automatically and regularly generated from the Belle II Membership Management System (B2MMS). If necessary, change your home email address in the B2MMS.

  • Belle II Support Contacts (login required)

  • Email: b2-helpdesk_AT_belle2.org (for any question regarding the Belle II collaborative services incl. the B2MMS)
  • Email: b2-registration-support_AT_belle2.org (for questions regarding registration or account)
  • Email: b2-wiki-support_AT_belle2.org (for questions regarding the wiki/confluence)

  • Change password exclusively on password.desy.de BEFORE it expires. Never register again! See Belle II Registration and Account FAQ.

  • Email: usersoffice_AT_mail.kek.jp (KEK account)

  • your belle2.org email address in your B2MMS personal record at the bottom.

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

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

Belle II maintains a set of Communication Tools. Most of them are directly available with the DESY login credentials.

Belle II Wiki

The content of the former KEK Belle II Twiki is now on two pages. The publicly viewable Belle II Public WebHome and the restricted Belle II Internal WebHome. The latter is visible to Belle II users only. Please find the login at the top right and use your Belle II account.

If you need technical support on confluence beyond the documentation, please contact the email address b2-helpdesk_AT_belle2.org.

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