First Measurement of Near-Threshold J/ψ Exclusive Photoproduction off the Proton / A. Ali, M. J. Amaryan, V. V. Gauzshteyn, V. E. Lyubovitskiy (Lyubovitskij)
Уровень набора: Physical Review LettersЯзык: английский.Страна: .Резюме или реферат: 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)..Примечания о наличии в документе библиографии/указателя: [References: 33 tit.].Аудитория: .Тематика: электронный ресурс | труды учёных ТПУ | фотопродукция | протоны Ресурсы он-лайн:Щелкните здесь для доступа в онлайнНет реальных экземпляров для этой записи
Title screen
[References: 33 tit.]
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).
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