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LHC: First reconstructed Beauty Particle (cern.ch)
11 points by helium on April 22, 2010 | hide | past | favorite | 8 comments


Yes, essentially what this is supposed to mean, is that the detector is (statistically speaking :) working.

Although B - or beauty - physics was the selling point at the time for the experiment, very few are deeply excited about it (SLAC BaBar did the same, and some CDF/D0 experiments). But perhaps the most intriguing was the beautiful Belle, from Japan. And don't forget, that ATLAS and CMS can do the same B physics also, being General Purpose detectors. So nobody is expecting great surprises, therefore people would rather focus on (very) rare decays, for which this detector is very well suited for, in hoping to find (another) thing not fitting the Standard Model (current holy grail, somewhat crippled anyway). All other GP detectors are "matroska"-like, trying to fish in a big soup of collision-events (many wonder about the event trigger on ATLAS, meaning how would they pick out interesting events from all the mess of the collisions...)

This detector is more like a fixed-target experiment detector (albeit working with colliding beams from the collider: actually the beams are defocused to generate less collisions, to have a "cleaner" picture). It is a "single arm spectrometer", used by those, who are leading experts in particle oscillations (B_0-s oscillate between states, useful for matter-antimatter studies). Antimatter and symmetry violations were proven with K oscillations; then around 1 TeV, B (particle) factories became "common place". And now, one might expect some particle oscillation at higher energies also, currently at 2x3.5 TeV, which is in the making...


What does this mean? I mean, I guess this tells us the LHCb is working correctly, but other than that I'm not sure what this tells us.


Yes, it just tells you that the detector seems to work. High energy physics experiments mostly rely on statistical analysis of large numbers of events these days. There are occasionally situations where there may be a single decisive "golden event", but b-quark physics left that stage decades ago. Now it is mostly about tiny, tiny differences between normal matter and antimatter that only manifest themselves in b and anti-b quark decays and which may explain why there is so much more matter than antimatter in the universe.

[And ugh, when did CERN PR resurrect that stupid "beauty" moniker, everybody has been using bottom and top instead of the pretentious beauty and truth for the third generation quarks since I can remember.]


As an ex (european) physicist, my experience is beauty/bottom have always been used interchangeably.


This is a big milestone for LHCb - it's primary objective is the study of beauty physics, that is physics related to the beauty/bottom quark (that is what the "b" stands for in the name).


From what I can gather "Beauty Particle" is the newer name for popular culture's "God Particle"?


No. Did you read the description on the page?

The Beauty Particle (called B+) is composed of an anti-quark b (that has a very short lifetime of 1.5 thousandth of a nanosecond!) and a quark u."

The God Particle (the Higgs Boson) is a fundamental particle, it is not composed of smaller particles.


My physics is rusty, but I think not. A Beauty particle is a bottom anti-quark paired with a up quark. The bottom quark was called beauty for a while, so that's probably why this particular combination is called a beauty particle.

The God particle is the Higgs boson. Note a boson is quite different to a lepton (e.g. electron or neutrino) or a fermion (e.g. quark or proton).




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