First ALICE paper

The ALICE collaboration has already published its first paper about lead on collisions. It is a ten page paper with the first five pages listing the authors :)

Update (2-Dec-2010): There is a workshop being webcast with first heavy ion results. In case you are reading this afterwards the slides are here.

6 Responses to First ALICE paper

  1. Ulla says:

    this one is off topic but it was discussed earlier.
    Errors lead to accusations that committee did not do its homework before making the 2010 award for physics.
    After enquiries made by Nature in advance of De Heer’s letter, the committee is making at least one correction to its online information, says chairman Ingemar Lundström. “Some of the things we also think are mistakes.”

    De Heer holds patents on the use of graphene in electronics, and made some of the earliest measurements of electronic effects in the material. Geim accuses de Heer of trying to boost his own reputation. “If he complains about Stockholm, some people might start thinking that he contributed something important,” says Geim.

    de Heer sees a series of errors that he believes overplay the significance of Geim and Novoselov’s work at the expense of other researchers. One example is Figure 3 of the document, which is taken from Geim and Novoselov’s 2004 paper. The caption says the data were obtained using graphene, which the document defines as “a single atomic layer of carbon”. But the result was actually obtained in few-layer graphene (FLG), a multilayer form of carbon also known as graphite.

    the work of Philip Kim of Columbia University in New York, whom many researchers think should have shared the prize.

    Lundström says that the committee is now correcting several points in its document raised by Nature and by De Heer’s letter, but says it is unlikely to change its general statement on the significance of the Manchester group’s 2004 work.

  2. Ulla says:
    The ATLAS experiment has released a major new result in the past few hours, and I’m very excited about it because I helped! A public preprint of our paper, already accepted for publication by Physical Review Letters, ( The result is that we’ve seen striking signs of a phenomenon called jet quenching in heavy ion collisions, in which hadronic jets get spread out and lose energy by interacting with the ultra hot and dense state of matter known as quark-gluon plasma. I’m exhausted, so I won’t try to explain it better than the CERN press release.

    • Philip Gibbs says:

      The jet quenching news is very nice, and shows how quickly new results can become apparent. I hope more detailed studies produce some good quantitative measurements that can be compared with the models.

  3. Ulla says:

    jet quenching? Asymptotic degrees of freedom? Wilczeks view with quasiparticles? First seen in RHIC.

    Jets are sprays of particles that fly out from high-energy collisions of particles like protons or lead ions. When protons or lead ions collide at high energies, what really collides are their component particles: quarks and gluons. Since nature has made it impossible for quarks or gluons to exist in isolation, as they move away from the point of collision they immediately turn into a narrow cascade, or jet, of particles.

    usually appearing in pairs as narrow cones of particles heading away in opposite directions from the collision point. the second jet has a much lower energy, and the narrow cone of particles has become much more diffused.

    the more “head-on” the collisions of lead ions, the more unbalanced

    the fact that the interactions are so strong, was completely unexpected, see it with their own eyes. “We also see that the jets remain exactly back-to-back, even when they’re quenched. This is startling, and was the kind of insight we didn’t get at RHIC.” “We see one jet that’s a sharp cone, and debris in the other direction that seems to originate from the recoiling jet. It’s analogous to comparing a drop of ink falling in air, and in water. In one case the drop goes straight ahead and in the other it diffuses and spreads as it interacts with the water, but in either case nothing is lost.”


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