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SELEX at Fermilab Discovers New Particle

sellthesedownfalls writes "Scientists at the Department of Energy's Fermi National Accelerator Laboratory will announce on Friday, June 18 the observation of an unexpected new member of a family of subatomic particles called 'heavy-light' mesons. The new meson, a combination of a strange quark and a charm antiquark, is the heaviest ever observed in this family, and it behaves in surprising ways -- it apparently breaks the rules on decaying into other particles. See the Fermilab Press Release."

11 of 259 comments (clear)

  1. Re:Slashdot Reader Discovers New Oxymoron by p3tersen · · Score: 5, Informative

    It's a bound state of two quarks. The charm quark is "heavy", i.e. relatively massive, while the the strange quark is less so.

  2. Rules by Anonymous Coward · · Score: 5, Insightful

    Many things will end up breaking the "rules" before it's all over.

  3. What, no pictures? by BrianMarshall · · Score: 5, Funny
    The meson lifetime is 10 (-24) seconds, or about the amount of time it takes light to cross a proton.

    Now, I think this is the lifetime of the usual shorter-lived mesons, but still...

    --
    "When the going gets weird, the weird turn pro" -- HST
    1. Re:What, no pictures? by Pi_0's+don't+shower · · Score: 5, Informative

      This is definitely "order of magnitude" a typical strong decay.

      There are two things which are unusual about this, however:

      1) It's a strong decay, and the particle is more massive than other exotic (with more than just down/up quarks) mesons, but this one lives longer than light mesons in its family. Whether this means it's longer lived than charm-down or charm-up mesons or longer lived than a lighter resonance of charm-strange isn't enunciated here, but either way, that's a surprise. There may be some type of parity conservation at work.

      (NB - strong interactions conserve parity)

      2) It decays into an eta particle much more often (6x more) than decay into a kaon. This is unusual, because more phase space is available for kaons (they have less mass than etas, therefore it's energetically favorable). Again, this could be related to parity issues, like pion decay (prefers muons over less-massive electrons), but that isn't enunciated here either.

      It just goes to show that there's a lot left to investigate just in the basic standard model -- something that a lot of the SUSY/string-loving public forgets quite often. (IAAP, btw)

  4. Re:False Alarm by Anonymous Coward · · Score: 5, Interesting

    allegedly true story:

    when CERN finished the construction of LEP, back in the day, they had a problem when they turned it on. the beam wouldn't align to collide and they had no idea why.

    upon further inspection, the problem was (allegedly) caused by a bottle of Heineken left behind in one of the beam tubes by a construction worker...

  5. A good quote by heyitsme · · Score: 5, Interesting
    I was just reading my copy of Fermilab Today (I am writing this from the lab) and saw this article. Then it appears on slashdot!

    The best description of this phenomenon comes from James Ross in the official press release:

    • "It's like watching a water bucket with a large hole and small hole in the bottom," Russ said. "For some reason, the water is pouring out the small hole six times faster than it's coming out of the large one. Something unusual must be going on inside the bucket."
  6. Heretics by BearJ · · Score: 5, Funny
    I for one am sick of all these subatomic particles breaking the rules. Surely there must be some sort of law to stop these "dirty hippie" (if you will). They're unconstitutional, and against the american way!

    --
    Stand clear of the doors. The doors are now closing.
  7. Not a stupid question! by benhocking · · Score: 5, Informative

    Actually, they do occur in nature. Specifically, they occur when a sufficiently energetic cosmic ray strikes our atmosphere.

    This is the same reason that many physicists laugh off the idea that they're going to create a mini-black hole that would sink to the earth's core and destroy us all. The universe is constantly running even higher-energy experiments in our atmosphere all the time - we just haven't placed our detectors in the right place! (To be fair to our hard-working particle physicists, you would need a VERY large detector hovering high in the air if you wanted to catch these things in nature.)

    --
    Ben Hocking
    Need a professional organizer?
  8. No such thing as "breaks the rules" by G4from128k · · Score: 5, Insightful

    If the data and rules disagree (and the data is valid) then "the rules" were never ever really correct. This is the most interesting and cognitively confounding element of science. So many experiments cause the perceived "rules" to change when in fact the true rules of the universe never change, only our approximations and estimations of them. This is why I wonder if so much of science is really just curve-fitting (F = m*a + delta, where delta contains relativistic effects, quantum effects, etc.) Similarly, I wonder if E = mc^2 + delta, where delta includes effects unseen because we haven't tested the formula over the entire span of possible conditions (energies, distances, mass concentrations, etc.)

    As an aside, a friend in college was religious because of this very issue. He hated the fact that science couldn't "make up its mind" abut what was true or not -- for him, an erroneous certainty was more comfortable than a changing, but progressively more correct uncertainty.

    --
    Two wrongs don't make a right, but three lefts do.
  9. Re:In other news... by DJ+Rubbie · · Score: 5, Funny

    The fire at Los Alamos has had one significant consequence. A secret scientific document was discovered in a bunker whose security systems were mostly destroyed by the fire. This document was leaked to the public last weekend.

    Actually it reveals nothing that we didn't already suspect. But it does show that besides arsenic, lead, mercury, radon, strontium and plutonium, one more extremely deadly and pervasive element is known to exist.

    This startling new discovery has been tentatively named Governmentium (Gv) but kept top secret for 50 years. The new element has no protons or electrons, thus having an atomic number of 0. It does, however, have 1 neutron, 125 deputy neutrons, 75 supervisory neutrons, and 111 team leader neutrons, giving it an atomic mass of 312.

    These 312 particles are held together by a force called morons, that are surrounded by vast quantities of lepton-like particles called peons. Since it has no electrons, Governmentium is inert. However, it can be detected as it impedes every reaction with which it comes into contact.

    According to the discoverers, a minute amount of Governmentium causes one reaction to take over four days to complete when it would normally take less than a second. Governmentium has a normal half-life of approximately three years. It does not decay but instead undergoes a reorganization in which a portion of the deputy neutrons, supervisory neutrons, and team leader neutrons exchange places. In fact, Governmentium mass will actually increase over time, since, with each reorganization, some of the morons inevitably become neutrons, forming new isodopes.

    This characteristic of moron promotion leads some scientists to speculate that Governmentium is formed whenever morons reach a certain quantity in concentration. This hypothetical quantity is referred to as the "Critical Morass."

    http://www.appleseeds.org/governmentium.htm

    --
    Please direct all bug reports to /dev/null
  10. Re:False Alarm by Tackhead · · Score: 5, Funny
    > The alleged story is indeed mostly true (reference here) although apparently it was two Heineken bottles, and the the theory of how they got there is that it was a prank, not an oversight during construction.

    The story is in an indeterminate state between truth and falsity, and apparently the number of bottles is in an indeterminate state between 1 and 2, and the theory of how they got there is referred to as the Heineken uncertainty principle.