In:
The European Physical Journal C, Springer Science and Business Media LLC, Vol. 83, No. 7 ( 2023-07-17)
Abstract:
The measurement of charmonium states produced in proton-neon ( $$p\text {Ne}$$ p Ne ) collisions by the LHCb experiment in its fixed-target configuration is presented. The production of $${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$ J / ψ and $$\psi {(2S)}$$ ψ ( 2 S ) mesons is studied with a beam of 2.5 $$\mathrm{\,Te\hspace{-1.00006pt}V}$$ Te V protons colliding on gaseous neon targets at rest, corresponding to a nucleon-nucleon centre-of-mass energy $$\sqrt{s_{\scriptscriptstyle \text {NN}}} =68.5\mathrm{\,Ge\hspace{-1.00006pt}V} $$ s NN = 68.5 Ge V . The data sample corresponds to an integrated luminosity of $$21.7\pm 1.4 $$ 21.7 ± 1.4 nb $$^{-1}$$ - 1 . The $${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$ J / ψ and $$\psi {(2S)}$$ ψ ( 2 S ) hadrons are reconstructed in $$\mu ^+$$ μ + $$\mu ^-$$ μ - final states. The $${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$ J / ψ production cross-section per target nucleon in the centre-of-mass rapidity range $$y^\star \in [-2.29, 0]$$ y ⋆ ∈ [ - 2.29 , 0 ] is found to be $$506 \pm 8 \pm 46 \text { nb/nucleon}$$ 506 ± 8 ± 46 nb/nucleon . The ratio of $${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$ J / ψ and $$D^0$$ D 0 cross-sections is evaluated to $$(1.06 \pm 0.02 \pm 0.09)\%$$ ( 1.06 ± 0.02 ± 0.09 ) % . The $$\psi {(2S)}$$ ψ ( 2 S ) to $${{J} \hspace{-1.66656pt}/\hspace{-1.111pt}\psi }$$ J / ψ relative production rate is found to be $$(1.67 \pm 0.27\pm 0.10)\%$$ ( 1.67 ± 0.27 ± 0.10 ) % in good agreement with other measurements involving beam and target nuclei of similar sizes.
Type of Medium:
Online Resource
ISSN:
1434-6052
DOI:
10.1140/epjc/s10052-023-11608-6
Language:
English
Publisher:
Springer Science and Business Media LLC
Publication Date:
2023
detail.hit.zdb_id:
1397769-6
detail.hit.zdb_id:
1459069-4
