First Measurement of Near-Threshold J/ψ Exclusive Photoproduction off the Proton; Physical Review Letters; Vol. 123, iss. 7
| Parent link: | Physical Review Letters Vol. 123, iss. 7.— 2019.— [072001, 6 p.] |
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| Ente Autore: | |
| Altri autori: | , , , |
| Riassunto: | 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 |
| Lingua: | inglese |
| Pubblicazione: |
2019
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| Soggetti: | |
| Accesso online: | https://doi.org/10.1103/PhysRevLett.123.072001 |
| Natura: | Elettronico Capitolo di libro |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=661243 |
| Riassunto: | 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 |
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| DOI: | 10.1103/PhysRevLett.123.072001 |