Line Shapes of the Z(4430)
| dc.creator | Braaten, Eric | |
| dc.creator | Lu, Meng | |
| dc.date | 2007-12-22 | |
| dc.date.accessioned | 2026-07-07T12:54:59Z | |
| dc.date.available | 2026-07-07T12:54:59Z | |
| dc.description | The Belle Collaboration recently discovered the first manifestly exotic meson: Z^+(4430), which decays into psi' pi^+ and therefore has quark content c c-bar u d-bar. The proximity of its mass to the D_1 D-bar^* threshold has motivated the interpretation of the Z^+ as a charm meson molecule whose constituents are an S-wave superposition of D_1^+ D-bar^{*0}$ and D^{*+} D-bar_1^0$. If this interpretation is correct, the small ratio of the binding energy of the Z^+ to the width Gamma_1 of its constituent D_1 can be exploited to predict properties of its line shapes. Its full width at half maximum in the channel psi' pi^+ should be approximately sqrt{3} Gamma_1 = 35 MeV, which is consistent with the measured width of the Z^+. The Z^+ should also decay into D^* D-bar^* pi through decay of its constituent D_1. The peak in the line shape for D^* D-bar^* pi should be at a higher energy than the peak in the line shape for psi' pi^+ by about Gamma_1/sqrt{12} = 6 MeV. The line shape in D^* D-bar^* pi should also be broader and asymmetric, with a shoulder on the high energy side that can be attributed to a threshold enhancement in the production of D_1 D-bar^*. | |
| dc.description | 4 pages, 1 figure | |
| dc.identifier | https://arxiv.org/abs/0712.3885 | |
| dc.identifier | http://arxiv.org/abs/0712.3885 | |
| dc.identifier | Phys.Rev.D79:051503,2009 | |
| dc.identifier | doi:10.1103/PhysRevD.79.051503 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/224130 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Line Shapes of the Z(4430) | |
| dc.type | text |