τ → f1π−ντ decay in the extended Nambu–Jona-Lasinio model
Семинары
Семинар «Физика адронов»
Дата и время: пятница, 22 декабря 2017 г., в 11:00
Место: Конференц-зал им. Блохинцева (4-й этаж), Лаборатория теоретической физики им. Н.Н. Боголюбова
Тема семинара: «τ → f1π−ντ decay in the extended Nambu–Jona-Lasinio model»
Докладчик: А. А. Пивоваров
Авторы: М. К. Волков, А. А. Пивоваров, А. А. Осипов
Аннотация:
Within the framework of the extended Nambu–Jona-Lasinio model, we calculate the matrix element of the τ → f1(1285)π−ντ decay and estimate the value of the branching ratio Br(τ → f1π−ντ) = 4.0 × 10−4. The two types of contributions are considered: the contact interaction, and the axial-vector IG(JPC) = 1−(1++) resonance exchange. The latter includes the ground a1(1260) state, and its first radially excited state, a|1(1640). The corrections caused by the πa1 transition are taken into account. The result is in a good agreement with known phenomenological data Brexp(τ → f1π−ντ) = (3.9 ± 0.5) × 10−4.