Four quark statesJanuary 23, 3:30pm - 4:30pm
Mānoa Campus, Watanabe Hall, 112
The Department of Physics and Astronomy Colloquium: Professor Frederick A. Harris, UHM, Department of Physics and Astronomy, to speak on "Four quark states."
One of the highlights of 2013, according to the editors of Physics, is the evidence from the BESIII and Belle experiments for particles containing four quarks, rather than the usual two or three. An international team of scientists, which includes members of the High Energy Physics Group in the Department of Physics and Astronomy at UH, began studies in 2013 with the Beijing Electron Positron Spectrometer (BESIII), aimed at understanding the anomalous ``Y(4260)'' particle. The collaboration found early last year in the decays of the Y(4260) a new, even more mysterious particle, the charged Z_c(3900), a four quark candidate, which was almost immediately confirmed by the Belle experiment. This was the first confirmed charged, charmonium-like state and has sparked much theoretical interest.
In the meantime, the collaboration has found in other processes in this energy region the Z_c(3885), Z_c(4020), and Z_c(4025). Although some of these may well be the same particle, there are at least two new four quark candidates. These results along with those from other analyses of the data and from additional data will be very important in the theoretical understanding of some of the mysterious XYZ particles.
Physics and Astronomy, Mānoa Campus
Dr. Frederick Harris, 808-956-2940, email@example.com