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Posted: **Mon Dec 21, 2009 11:08 am**

Hi,

I am new on this forum.

Watching the second "LHC status report" video (http://cdsweb.cern.ch/search?f=490__a&p=LHC%20reports) I noticed that the spokesperson of CMS and LHCb mentioned dimuon events at 3030 MeV and all the assembly was laughing.

Do you know what these events are ?

Thanks

Posted: **Mon Dec 21, 2009 3:16 pm**

This Dimuon event is a J/Psi candidate. The J/Psi decays among other channels into two muons and is important, because it can be well reconstructed.

Posted: **Mon Dec 21, 2009 10:45 pm**

Thanks for the explanation !

Posted: **Tue Dec 22, 2009 5:54 pm**

Ah so that's what this was about!
http://cms.web.cern.ch/cms/News/e-comme ... 222_05.jpg

LHC portal

Dimuon events seen at LHCb and CMS

Dimuon events seen at LHCb and CMS

Re: Dimuon events seen at LHCb and CMS

Re: Dimuon events seen at LHCb and CMS

Re: Dimuon events seen at LHCb and CMS