Speaker
Kirill Chilikin
(ITEP, MEPhI)
Description
Recent results on charged charmoniumlike states at Belle are presented.
A full amplitude analysis of $\bar{B}^0 \to \psi(2S) K^- \pi^+$ decays,
with $\psi(2S)\to\mu^+\mu^-\text{ or }e^+e^-$, was performed to constrain the
spin and parity of the $Z_c(4430)^+$. The $J^P=1^+$ hypothesis is
favored over the $0^-$, $1^-$, $2^-$ and $2^+$ hypotheses at the levels
of $3.4\sigma$, $3.7\sigma$, $4.7\sigma$ and $5.1\sigma$, respectively.
A full amplitude analysis of $\bar{B}^0 \to J/\psi K^- \pi^+$ decays was performed. A new charged charmoniumlike state $Z_c(4200)^+$ decaying to $J/\psi \pi^+$ is
observed with a significance of $6.2\sigma$.
The mass and width of the $Z_c(4200)^{+}$ are $4196^{+31+17}_{-29-13}$ $MeV/c^2$ and $370^{+70+70}_{-70-132}$ MeV, respectively, the preferred assignment of the quantum numbers is $J^P=1^+$.
In addition, evidence for $Z_c(4430)^+ \to J/\psi \pi^+$ is found.
| Presentation type | Section talk (10+5 min) |
|---|
Primary author
Kirill Chilikin
(ITEP, MEPhI)
