Tommaso’s Tips

June 11, 2006 at 4:33 pm 2 comments

I must tip my hat to Tommaso, who has made several excellent HEP-related posts in the past several days. In particular, he has tipped us off to some interesting physics from the Tevatron.

First, he described with wonderful clarity and simplicity the analysis of the angular decay distributions of the X(3872). This is a very nice result coming from CDF which helps identify the nature of this peculiar object. See his post for the discussion, to which I would add that this kind of physics is rich and interesting, if not the most popular in HEP. However, if you want really to know what’s going on, you need to pay attention – if new particles are found at the LHC then the same kinds of analyses will be needed to identify them. Also, I agree that it is slightly embarassing that CDF had a nice signal in the data but did not spot this until after Belle did. We are not being vigilant enough, perhaps…

Second, Tommaso predicts that evidence for single-top production will be found by CDF and D0 this year. He is probably right, and for the reasons why this is a difficult experimental task, see his posting. This topic has been on the main menu of the Tevatron program since the beginning of Run II, so it will be nice to check that one off, as we have already done for di-boson production. And as more data are accumulated, this provides another opportunity to probe for new physics, either in the properties of the signal events, or in related samples. Is there a reason why one might see a top-bottom resonance – certainly possible. Could anomalous events fall into this SM sample? Let’s hope so, and that someone looks.

Finally, Tommaso discussed the famous Mtop-MW plot which shows that the measurements are more comfortable with the MSSM than with the SM, though they do not rule out the SM (as Tommaso stresses). Here I see things a little differently than Tommaso does, so I will have to prepare my own comments on what this plot means and what the future may bring. On one thing I strong agree and would emphasize: the precise measurement of the top-quark mass must remain a high priority for the Tevatron program. Not only does it help give a hint of what is to come at the LHC, but for experimental reasons the Tevatron experiments really can measure this better than the LHC ones, at least for the next several years. I hope very much we will achieve 1.0 GeV, which can be compared to the projection of 1.5 GeV at the LHC…


Entry filed under: Particle Physics.

Serendipity in HEP? Return

2 Comments Add your own

  • 1. name  |  August 31, 2008 at 8:32 pm


  • 2. name  |  August 31, 2008 at 8:33 pm

    Good day!,


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