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 five of your free articles for this month.

Insider Premium

$179.95/yr US PRICE

Want more award-winning journalism? Subscribe to Insider Premium.

  • Insider Premium {! insider.prices.premium !}*

    {! insider.display.menuOptionsLabel !}

    Our award winning magazine, unlimited access to our story archive, special discounts to MIT Technology Review Events, and exclusive content.

    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.

    Access to the Magazine archive. Over 24,000 articles going back to 1899 at your fingertips.

    Special Discounts to select partner offerings

    Discount to MIT Technology Review events

    Ad-free web experience

    First Look. Exclusive early access to stories.

    Insider Conversations. Join in and ask questions as our editors talk to innovators from around the world.

You've read of free articles this month.