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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----- Give peace a chance! -----

Your DESY password is valid for 6 month. You will get a series of warnings by email, starting 20 days in advance. Please make sure to renew your password in time via The service now contains a PASSWORD RECOVERY functionality.

In case of questions or problems check Belle II Registration and Account FAQ !


Belle II authors are identified by their ORCID. Please enter it in your B2MMS record. See User Data.

The most frequent user issues:

  • Everyone who acts in the context of Belle II is a Belle II users, incl. summer students.
  • Please do NOT register a second time!

Problems with account or password? (NOT Resetting a lost password might take some time! Include your account_name in the email!

Maintenance Announcements

(please login to see details)


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.

You can get access to the Belle II authorship service beyond your Belle II membership. On request to your account will be move to a group 'b2author' which allows to access the authorship service.

2022-12-01 Password Recovery

A PASSWORD RECOVERY functionality is available in .

2019-02-19 Belle II Indico

In order to make use of the new Belle II Indico Instructions make sure you log in to 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 (account_name/password), not email address. Also note Belle II Support Contacts.

Note: Most of the Grid services run at KEK (DIRAC, VOMS (master)) or at BNL (FTS, RUCIO). Those services are independent!

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