Resummation of Large Endpoint Corrections to Color-Octet J/psi Photoproduction
| dc.creator | Fleming, Sean | |
| dc.creator | Leibovich, Adam K. | |
| dc.creator | Mehen, Thomas | |
| dc.date | 2006-07-11 | |
| dc.date.accessioned | 2026-07-07T11:05:13Z | |
| dc.date.available | 2026-07-07T11:05:13Z | |
| dc.description | An unresolved problem in J/psi phenomenology is a systematic understanding of the differential photoproduction cross section, dsigma/dz [gamma + p -> J/psi + X], where z= E_psi/E_gamma in the proton rest frame. In the non-relativistic QCD (NRQCD) factorization formalism, fixed-order perturbative calculations of color-octet mechanisms suffer from large perturbative and nonperturbative corrections that grow rapidly in the endpoint region, z -> 1. In this paper, NRQCD and soft collinear effective theory are combined to resum these large corrections to the color-octet photoproduction cross section. We derive a factorization theorem for the endpoint differential cross section involving the parton distribution function and the color-octet J/psi shape functions. A one loop matching calculation explicitly confirms our factorization theorem at next-to-leading order. Large perturbative corrections are resummed using the renormalization group. The calculation of the color-octet contribution to dsigma/dz is in qualitative agreement with data. Quantitative tests of the universality of color-octet matrix elements require improved knowledge of shape functions entering these calculations as well as resummation of the color-singlet contribution which accounts for much of the total cross section and also peaks near the endpoint. | |
| dc.description | 30 pages, 6 figures | |
| dc.identifier | https://arxiv.org/abs/hep-ph/0607121 | |
| dc.identifier | http://arxiv.org/abs/hep-ph/0607121 | |
| dc.identifier | Phys.Rev.D74:114004,2006 | |
| dc.identifier | doi:10.1103/PhysRevD.74.114004 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/189140 | |
| dc.subject | High Energy Physics - Phenomenology | |
| dc.title | Resummation of Large Endpoint Corrections to Color-Octet J/psi Photoproduction | |
| dc.type | text |