First Measurement of Near-Threshold J/ψ Exclusive Photoproduction off the Proton
| Parent link: | Physical Review Letters Vol. 123, iss. 7.— 2019.— [072001, 6 p.] |
|---|---|
| Corporate Author: | |
| Other Authors: | , , , |
| Summary: | Title screen We report on the measurement of the γp→J/ψp cross section from Eγ=11.8 GeV down to the threshold at 8.2 GeV using a tagged photon beam with the GlueX experiment. We find that the total cross section falls toward the threshold less steeply than expected from two-gluon exchange models. The differential cross section dσ/dt has an exponential slope of 1.67±0.39 GeV−2 at 10.7 GeV average energy. The LHCb pentaquark candidates P+c can be produced in the s channel of this reaction. We see no evidence for them and set model-dependent upper limits on their branching fractions B(P+c→J/ψp) and cross sections σ(γp→P+c)×B(P+c→J/ψp). Режим доступа: по договору с организацией-держателем ресурса |
| Published: |
2019
|
| Subjects: | |
| Online Access: | https://doi.org/10.1103/PhysRevLett.123.072001 |
| Format: | Electronic Book Chapter |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=661243 |