Researchers from the Budker Institute of Nuclear Physics SB RAS and 吃瓜官网 are about to take part in experiments on studying the properties of a newly confirmed particle Z(4430), which is a new type of a meson created in the Large Hadron Collider in Geneva, Switzerland.
鈥楾he world's first evidence of Z(4430) particle was announced to be seen in 2008, in data from Japan's KEK particle accelerator,鈥� says a Deputy Director for Science at BINP and the Dean of the Physics Department at NSU, Prof. Alexander E. Bondar. 鈥極f course, all the physicists were eager to check the results and even try to see them again during the experiment at the B factory facility at Stanford, but Z(4430) remained invisible. Thus, the discrepancies between the experiments could not be explained until the LHC gave strong data confirming the previous results from Japan, after three years of careful analysis. Now, the long-standing ambiguity has been solved.鈥�
Z(4430) is quite unique in having an electrical charge and decaying instantly into a pi-meson and a charmonium meson consisting of a charmed quark and an antiquark. According to A.Bondar, it implies the specificity of the meson being likely a four quark system rather than two, which comprised a quark and an antiquark, as well-studied mesons commonly did. Only recently has it become possible to see such particles during the experiments as only high emissivity installations allow the study of the processes. However, such objects completely agree with what one would expect from the Standard Model, and physicists did have a notion about their existence quite a long time ago. Due to some new strong experimental data we know that a few particles of such a type have already been detected. Some of the particles include other quarks (e.g., a charmed quark).
Prof. Alexander Bondar said that properties of Z(4430) and similar objects are to be studied further, both with LHC and the modified super B factory facility in Japan. The latter is now being created by an international collaboration team including some Siberian physicists from BINP and NSU. The experiments are to start in 2016.
