pentaquark

pentaquark englanniksi

1. Any of a class of particles (previously hypothetical, since detected, subject to confirmation) consisting of a group of five quarks (compared to three quarks in normal baryons and two in mesons), or more specifically four quarks and one antiquark (symbol Θ).

2. (quote-book)

3. (quote-journal) "Pentaquarks have been reported several times in the past," says Patrick Koppenburg, "but they all appeared to be fakes." So when the team at the LHCb experiment detected what looked like the signature of a pentaquark, they were determined to take their time with the analysis. Now they are pretty certain they have it. The signal has a "10 sigma" stamp of accuracy, meaning that there is only a 1 in 1022 chance of it being a statistical fluctuation.

4. (l)