A View from David Appell

Weird Mesons

Physicists in Japan have discovered an odd new particle, the latest in a string of odd particles made up of quarks and gluons. This newest member is a hybrid meson, consisting of a quark, an antiquark, and a gluon. (All…

  • May 19, 2005

Physicists in Japan have discovered an odd new particle, the latest in a string of odd particles made up of quarks and gluons. This newest member is a hybrid meson, consisting of a quark, an antiquark, and a gluon. (All previous mesons have consisted of a quark and an antiquark.) The quarks are of the charmed flavor, and the resulting meson is called Y(3940), where the number represents its mass in MeV. This strange type of meson, first predicted twenty-five years ago (1978), joins the pentaquark and the 4-quark X particle as new additions to the unexpected family of weird mesons.

Uh oh–you've read all of your free articles for this month.

Insider Premium
$179.95/yr US PRICE

Want more award-winning journalism? Subscribe to Insider Basic.
  • Insider Basic {! insider.prices.basic !}*

    {! insider.display.menuOptionsLabel !}

    Six issues of our award winning magazine and daily delivery of The Download, our newsletter of what’s important in technology and innovation.

    See details+

    What's Included

    Bimonthly home delivery and unlimited 24/7 access to MIT Technology Review’s website.

    The Download. Our daily newsletter of what's important in technology and innovation.

/
You've read all of your free articles this month. This is your last free article this month. You've read of free articles this month. or  for unlimited online access.