Publication: First Measurement of Near-Threshold J/psi Exclusive Photoproduction off the Proton
Дата
2019
Авторы
Ali, A.
Amaryan, M.
Anassontzis, E. G.
Austregesilo, A.
Berdnikov, V.
Romanov, D.
Somov, S.
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Аннотация
We report on the measurement of the gamma p -> J/psi p cross section from E-gamma = 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 d sigma/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/psi p) and cross sections sigma(gamma p -> P-c(+)) x B(P-c(+) -> J/psi p).
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Цитирование
First Measurement of Near-Threshold J/psi Exclusive Photoproduction off the Proton / Ali, A [et al.] // Physical Review Letters. - 2019. - 123. - № 7. - 10.1103/PhysRevLett.123.072001
URI
https://www.doi.org/10.1103/PhysRevLett.123.072001
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https://openrepository.mephi.ru/handle/123456789/18543