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@ARTICLE{Du:887963,
author = {Du, Meng-Lin and Baru, Vadim and Guo, Feng-Kun and Hanhart,
Christoph and Meißner, Ulf-G. and Nefediev, Alexey and
Strakovsky, Igor},
title = {{D}eciphering the mechanism of near-threshold $${J}/\psi $$
photoproduction},
journal = {The European physical journal / C},
volume = {80},
number = {11},
issn = {1434-6052},
address = {Heidelberg},
publisher = {Springer},
reportid = {FZJ-2020-04549},
pages = {1053},
year = {2020},
abstract = {The photoproduction of the J/ψ off the proton is believed
to deepen our understanding of various physics issues. On
the one hand, it is proposed to provide access to the origin
of the proton mass, based on the QCD multipole expansion. On
the other hand, it can be employed in a study of pentaquark
states. The process is usually assumed to proceed through
vector-meson dominance, that is the photon couples to a J/ψ
which rescatters with the proton to give the J/ψp final
state. In this paper, we provide a compelling hint for and
propose measurements necessary to confirm a novel production
mechanism via the ΛcD¯(∗) intermediate states. In
particular, there must be cusp structures at the ΛcD¯(∗)
thresholds in the energy dependence of the J/ψ
photoproduction cross section. The same mechanism also
implies the J/ψ-nucleon scattering lengths of order 1 mfm.
Given this, one expects only a minor contribution of charm
quarks to the nucleon mass.},
cin = {IAS-4 / IKP-3},
ddc = {530},
cid = {I:(DE-Juel1)IAS-4-20090406 / I:(DE-Juel1)IKP-3-20111104},
pnm = {511 - Computational Science and Mathematical Methods
(POF3-511) / DFG project 196253076 - TRR 110: Symmetrien und
Strukturbildung in der Quantenchromodynamik (196253076)},
pid = {G:(DE-HGF)POF3-511 / G:(GEPRIS)196253076},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000594659200002},
doi = {10.1140/epjc/s10052-020-08620-5},
url = {https://juser.fz-juelich.de/record/887963},
}