| Title | Upsilon(4S,5S)->Upsilon(1S)eta transitions in the rescattering model and the new BABAR measurement |
| Authors | Meng, Ce Chao, Kuang-Ta |
| Affiliation | Peking Univ, Dept Phys, Beijing 100871, Peoples R China. Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China. Peking Univ, Ctr High Energy Phys, Beijing 100871, Peoples R China. |
| Keywords | X(3872) DECAY STATE |
| Issue Date | 2008 |
| Publisher | physical review d |
| Citation | PHYSICAL REVIEW D.2008,78,(7). |
| Abstract | The eta transitions of Upsilon(4S,5S) into Upsilon(1S,2S) are studied in the rescattering model by considering the final state interactions above the B(B)overbar threshold. The width of the eta transition of Upsilon(4S) into Upsilon(1S) is found to be larger than that of the dipion transition, and the ratio of Gamma(Upsilon(4S)->Upsilon(1S)eta) to Gamma(Upsilon(4S)->Upsilon(1S)pi(+)pi(-)) is predicted to be R(4)=1.8-4.5, which is about 2 orders of magnitude larger than the expectation of the conventional hadronic transition theory, and is supported by the new BABAR measurement. The widths of the eta transitions of Upsilon(5S) are found to be sensitive to the coupling constants g(Upsilon(5S)B)((*))B((*)) due to a large cancellation between contributions from the B(B)overbar, B(*)(B)overbar+c.c., and B(*)(B)overbar(*) channels, and only a rough estimate Gamma(Upsilon(5S)->Upsilon(1S,2S)eta)=10-200 KeV can be given. The widths of the eta(') transitions of Upsilon(4S,5S) are also discussed, and they could be much smaller than that of the corresponding eta transitions mainly due to the tiny phase space. |
| URI | http://hdl.handle.net/20.500.11897/297630 |
| ISSN | 1550-7998 |
| DOI | 10.1103/PhysRevD.78.074001 |
| Indexed | SCI(E) |
| Appears in Collections: | 物理学院 核物理与核技术国家重点实验室 |
