Journal Article

FZJ-2020-04549

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Deciphering the mechanism of near-threshold $$J/\psi $$ photoproduction

Du, M.-L.Extern* ; Baru, V. ; Guo, F.-K. (Corresponding author)Extern* ; Hanhart, C.FZJ* ; Meißner, U.-G.FZJ* ; Nefediev, A.FZJ* ; Strakovsky, I.Extern*

2020
Springer Heidelberg

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Please use a persistent id in citations: http://hdl.handle.net/2128/26226  doi:10.1140/epjc/s10052-020-08620-5

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.

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Contributing Institute(s):

1. Theorie der Starken Wechselwirkung (IAS-4)
2. Theorie der starken Wechselwirkung (IKP-3)

Research Program(s):

1. 511 - Computational Science and Mathematical Methods (POF3-511) (POF3-511)
2. DFG project 196253076 - TRR 110: Symmetrien und Strukturbildung in der Quantenchromodynamik (196253076) (196253076)

Appears in the scientific report 2020

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Database coverage:
; ; ; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; DOAJ Seal ; Ebsco Academic Search ; Essential Science Indicators ; IF < 5 ; JCR ; Nationallizenz ; SCOAP3 sponsored Journal ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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