First Measurement of Near-Threshold J/ψ Exclusive Photoproduction off the Proton; Physical Review Letters; Vol. 123, iss. 7

First Measurement of Near-Threshold J/ψ Exclusive Photoproduction off the Proton; Physical Review Letters; Vol. 123, iss. 7

Bibliographic Details
Parent link:Physical Review Letters
Vol. 123, iss. 7.— 2019.— [072001, 6 p.]
Corporate Author: Национальный исследовательский Томский политехнический университет Исследовательская школа физики высокоэнергетических процессов
Other Authors: Ali A. Arshad, Amaryan M. J. Moskov, Gauzshteyn (Gauzshtein) V. V. Vyacheslav Valerjevich, Lyubovitskiy (Lyubovitskij) V. E. Valery Efimovich
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
Language:English
Published: 2019
Subjects:
электронный ресурс
труды учёных ТПУ
фотопродукция
протоны
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

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