Comments on: Needle in a haystack http://www.quantumdiaries.org/2012/05/10/needle-in-a-haystack/ Thoughts on work and life from particle physicists from around the world. Tue, 18 Jun 2013 15:29:00 +0000 hourly 1 http://wordpress.org/?v=3.5.1 By: Anna Phan http://www.quantumdiaries.org/2012/05/10/needle-in-a-haystack/#comment-69044 Anna Phan Sun, 13 May 2012 14:42:52 +0000 http://www.quantumdiaries.org/?p=22351#comment-69044 Hi,

Thanks for taking an interest! Yes, the measured branching ratio [(2.4 ± 0.6 (stat) ± 0.2 (syst))×10−8] is compatible with the Standard Model prediction [(1.96 ± 0.21)×10−8]. I would have made a point of it if it wasn’t!

Cheers,
Anna

]]> By: Anna Phan http://www.quantumdiaries.org/2012/05/10/needle-in-a-haystack/#comment-69043 Anna Phan Sun, 13 May 2012 14:40:10 +0000 http://www.quantumdiaries.org/?p=22351#comment-69043 Hi,

Thanks for noticing that the Feynman diagram didn’t match the text. I’ve changed everything to be B-.

Cheers,
Anna

]]> By: Joe Prokop http://www.quantumdiaries.org/2012/05/10/needle-in-a-haystack/#comment-68930 Joe Prokop Sun, 13 May 2012 01:50:15 +0000 http://www.quantumdiaries.org/?p=22351#comment-68930 Hi Anna,

With regard to the B+ decay, should not the B+ consist of an UP quark and an anti B quark to give a charge of + 1. I enjoy your Blog.

Thanks

]]> By: Nikola Nikolov http://www.quantumdiaries.org/2012/05/10/needle-in-a-haystack/#comment-68812 Nikola Nikolov Fri, 11 May 2012 15:52:15 +0000 http://www.quantumdiaries.org/?p=22351#comment-68812 Is the rate of that decay compatible with the SM prediction?

]]> By: Anna Phan http://www.quantumdiaries.org/2012/05/10/needle-in-a-haystack/#comment-68768 Anna Phan Fri, 11 May 2012 07:00:24 +0000 http://www.quantumdiaries.org/?p=22351#comment-68768 Yes, you are right, the intermediate quark can also be an up quark. However, this transition is just as unlikely as the other two.

]]> By: Xezlec http://www.quantumdiaries.org/2012/05/10/needle-in-a-haystack/#comment-68730 Xezlec Fri, 11 May 2012 00:50:14 +0000 http://www.quantumdiaries.org/?p=22351#comment-68730 Neat. But why does the intermediate quark have to be a top or a charm? Why not up?

]]> By: Aidan Randle-Conde http://www.quantumdiaries.org/2012/05/10/needle-in-a-haystack/#comment-68700 Aidan Randle-Conde Thu, 10 May 2012 18:50:11 +0000 http://www.quantumdiaries.org/?p=22351#comment-68700 Hey Anna, as a BaBarian and a B-physics enthusiast I just want to say that this in amazing result! To see a branching fraction that is of the order of 10^-8 means that LHCb is well and truly past the reach of the B factories. I can’t wait to see what else LHCb has to offer.

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