Hi,

 

I have a question. In this physical review letters article, what particles do [math]\bar{v}[/math] and [math]v[/math] stand for?

Anti-neutrinos and neutrinos, respectively. It's the Greek letter "nu", not a "v", btw.

Thanks for the reply Timo. But what does the [math]\bar{b}[/math][math]b[/math] stand for?

Anti-bottom-quark and Bottom-quark.

Thanks Timo.

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What does B → Xcℓν mean?

I couldn't find that in the text, so I dunno. "l" probably means a charged lepton, nu probably still is a neutrino, the arrow indicates a decay. Could it be that the "B" is not a capital one and the "c" is not a subscript to the "X"? It might be the decay of a bottom-boson into a charm-boson, a lepton (i.e. electron, muon or tau), the neutrino fitting to the lepton (to preserve fermion number), and whatever crap possibly also produced but irrelevant to the discussion (some stuff X), then. But without knowing where you read that that is only a guess.

I took it from here: http://arxiv.org/PS_cache/arxiv/pdf/0907/0907.0379v2.pdf and it appears that c is a subscript of X.

Then it presumably means the decay of some hadron containing a b-quark to a hadron containing a u-quark and the lepton and neutrino that come from the decay of the b-quark into an up-quark. But that also is just a guess; I have little to no experience with hadrons and never read a b-physics paper myself.

So what does X_c mean?

Same as the [math]X_u[/math] except with a charm-quark instead of an up-quark.