Comments on: Beam Dump http://erc.nd.edu/blogs/dberry/2010/05/03/beam-dump/ Just another NDeRC Grad Student Blogs weblog Thu, 27 May 2010 14:40:35 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: dberry http://erc.nd.edu/blogs/dberry/2010/05/03/beam-dump/comment-page-1/#comment-78 dberry Tue, 04 May 2010 09:39:21 +0000 http://erc.nd.edu/blogs/dberry/?p=61#comment-78 The reconstruction algorithm assumes the muons are coming from the primary vertex, which is the yellow dot in the center. However, we know that the muons are actually coming from the right. We can tell this because there are more hits in the right side than the left side. The muons from the beam dump make the CSCs fire. The reconstruction algorithm looks at these hits and tries to make a centrally generated muon (Red Lines). However, these muons aren't coming from the center, so the reconstruction is invalid. The reconstruction algorithm assumes the muons are coming from the primary vertex, which is the yellow dot in the center. However, we know that the muons are actually coming from the right. We can tell this because there are more hits in the right side than the left side.

The muons from the beam dump make the CSCs fire. The reconstruction algorithm looks at these hits and tries to make a centrally generated muon (Red Lines). However, these muons aren’t coming from the center, so the reconstruction is invalid.

]]> By: pmooney http://erc.nd.edu/blogs/dberry/2010/05/03/beam-dump/comment-page-1/#comment-77 pmooney Mon, 03 May 2010 16:27:57 +0000 http://erc.nd.edu/blogs/dberry/?p=61#comment-77 Hi Doug, Thanks for sharing this unusual "event" with us. For the benefit of your audience would you explain how you know the muons are incorrectly reconstructed and why the software makes this "mistake". (You did say that muons were present. What's incorrect about the reconstruction?) This would give your audience several insights into the workings of a collider detector and the associated reconstruction software. Alternatively you could challenge your non-particle physics portion of your audience to come up with an explanation to see what sort of discussion ensues over the next 2-3 days. Thanks, Pat Hi Doug,

Thanks for sharing this unusual “event” with us. For the benefit of your audience would you explain how you know the muons are incorrectly reconstructed and why the software makes this “mistake”. (You did say that muons were present. What’s incorrect about the reconstruction?) This would give your audience several insights into the workings of a collider detector and the associated reconstruction software.

Alternatively you could challenge your non-particle physics portion of your audience to come up with an explanation to see what sort of discussion ensues over the next 2-3 days.

Thanks,
Pat

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