Invariant-mass distribution of cc-bar in Upsilon(1S) -> cc-bar + X
| dc.creator | Chung, Hee Sok | |
| dc.creator | Kim, Taewon | |
| dc.creator | Lee, Jungil | |
| dc.date | 2008-05-14 | |
| dc.date.accessioned | 2026-07-07T12:26:55Z | |
| dc.date.available | 2026-07-07T12:26:55Z | |
| dc.description | We calculate the invariant-mass distribution for the cc-bar pair produced in the inclusive Upsilon(1S) decay based on the color-singlet mechanism of the nonrelativistic quantum chromodynamics factorization approach at leading order in the bottom-quark velocity v_b in the meson rest frame. As the short-distance processes, we consider bb-bar -> g^*gg followed by g^* -> cc-bar and bb-bar -> gamma^* -> cc-bar at leading order in the strong coupling. The invariant-mass distribution of the bb-bar -> cc-bar gg contribution has a sharp peak just above the threshold and that of the bb-bar -> gamma^* -> cc-bar channel is concentrated at the maximally allowed kinematic end point. We predict that Gamma[Upsilon(1S) -> cc-bar+X]/Gamma[Upsilon(1S)->light hadrons] = 0.065 alpha_s, which is smaller than a previous result by about 20%. | |
| dc.description | 15 pages, 1 figure | |
| dc.identifier | https://arxiv.org/abs/0805.1989 | |
| dc.identifier | http://arxiv.org/abs/0805.1989 | |
| dc.identifier | Phys.Rev.D78:114027,2008 | |
| dc.identifier | doi:10.1103/PhysRevD.78.114027 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/215037 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Invariant-mass distribution of cc-bar in Upsilon(1S) -> cc-bar + X | |
| dc.type | text |