The color-singlet contribution to e^+ e^- ->J/psi + X at the endpoint
| dc.creator | Leibovich, Adam K | |
| dc.creator | Liu, Xiaohui | |
| dc.date | 2007-05-22 | |
| dc.date.accessioned | 2026-07-07T10:55:46Z | |
| dc.date.available | 2026-07-07T10:55:46Z | |
| dc.description | Recent observations of the J/psi spectrum produced in e^+e^- collisions at the Upsilon(4S) resonance are in conflict with fixed-order calculations using Non-Relativsitic QCD effective theory (NRQCD). One problem is an enhancement in the cross section when the J/psi has maximal energy, due to large perturbative corrections (Sudakov logarithms). In a recent paper, the Sudakov logarithms in the color-octet contribution were summed by combining NRQCD with the Soft-Collinear Effective Theory. However to be consistent, the color-singlet contributions must also be summed in the endpoint region which was not done in that paper. In this paper, we sum the leading and next-to-leading logarithms in the color-singlet contribution to the J/psi production cross section. We find that the color-singlet cross section is suppressed near endpoint compared to the fixed order NRQCD prediction. | |
| dc.description | 17 pages, 7 figures | |
| dc.identifier | https://arxiv.org/abs/0705.3230 | |
| dc.identifier | http://arxiv.org/abs/0705.3230 | |
| dc.identifier | Phys.Rev.D76:034005,2007 | |
| dc.identifier | doi:10.1103/PhysRevD.76.034005 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/186186 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | The color-singlet contribution to e^+ e^- ->J/psi + X at the endpoint | |
| dc.type | text |